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George Herbert Leigh-Mallory (18 June 1886 – 8 or 9 June 1924) was an English mountaineer who participated in the first three British Mount Everest expeditions from the early to mid-1920s.

Born in Mobberley, Cheshire, Mallory became a student at Winchester College, Hampshire, where a teacher recruited him for an excursion in the Alps, and he developed a strong natural ability for climbing. After graduating from Magdalene College, Cambridge, he taught at Charterhouse School, Godalming, while honing his climbing skills in the Alps and the English Lake District. He served in the British Army during the First World War and fought at the Somme.

After the war, Mallory returned to Charterhouse before resigning to participate in the 1921 British Mount Everest reconnaissance expedition. In 1922, he took part in a second expedition to make the first ascent of the world's highest mountain, in which his team achieved a world altitude record of 8321 m using supplemental oxygen. Once, when asked by a reporter, "Why did you want to climb Mount Everest?" Mallory purportedly replied, "Because it's there."

During the 1924 expedition, Mallory and his climbing partner, Andrew "Sandy" Irvine, disappeared on the Northeast Ridge of Everest. The last sighting of the pair was approximately 800 vertical feet (243.84 m) from the summit. Mallory's body was discovered and identified 75 years later, on 1 May 1999, by a research expedition that had set out to search for the climbers' remains. Whether Mallory and Irvine reached the summit before they died remains a subject of debate, various theories, and continuing research.

Childhood
George Herbert Leigh-Mallory was born at Newton Hall, Mobberley, Cheshire, on 18 June 1886, the first son and second child of the Reverend Herbert Leigh Mallory (1856–1943),rector of the parish. His mother was Annie Beridge Leigh-Mallory ( Jebb; 1863–1945), the posthumous daughter of the Reverend John Beridge Jebb of Walton, Chesterfield, Derbyshire. Mallory had two sisters, Mary Henrietta (1885–1980) and Annie Victoria (Avie) (1887–1989), and a younger brother, Trafford (1892–1944), the World War II Royal Air Force commander. Mallory's two sisters, Mary Henrietta and Annie Victoria, were also born at Newton Hall. At the end of 1891, the Mallorys moved from Newton Hall, Mobberley, to Hobcroft House, Hobcroft Lane, Mobberley, where Mallory's brother Trafford was born. The family resided there until 1904, when they moved to Birkenhead, Cheshire. Mallory exhibited an early audaciousness for climbing. At age seven, his first venture into climbing was the roof of his father's church, St Wilfrid's, in Mobberley, Cheshire. His sister Avie recalls, "He climbed everything that it was at all possible to climb." Included in his climbing escapades were the drainpipes of the Mallory family home, Hobcroft House, and the walls that divided the farmers' fields. In 1914, Mallory's father, Herbert Leigh Mallory, adopted the surname Leigh-Mallory by royal licence.

1896–1905: West Kirby, Glengorse, and Winchester College
In 1896, Mallory was sent to Glengorse boarding school in Eastbourne on the south coast of England after the headmaster of his first preparatory school in West Kirby near Birkenhead, Cheshire, died, resulting in its abrupt closure. During the summer of 1900, Mallory won a mathematics scholarship to Winchester College, where he started as a mathematical scholar in September of that year. At Winchester, he was proficient at sports, in addition to his academic excellence. Mallory played soccer for College VI in Winchester's idiosyncratic version of inter-house six-a-side football. As a gymnast, he became the most superlative in the school, the only one capable of performing the giant swing on the horizontal bar. In July 1904, Mallory was a Winchester Shooting VIII team member who won the Ashburton Shield at the annual Bisley competition against other public schools.

Robert Lock Graham Irving was a senior master in Mallory's house at Winchester, an accomplished mountaineer and a member of the Alpine Club. In 1904, Irving was searching for new climbing companions after the death of his climbing partner in an accident, with whom he had done most of his climbing. He resolved to find some Winchester students and train them as recruits. Irving recruited Mallory and his fellow pupil and friend, Harry Olivier Sumner Gibson (1885–1917), for a trip to the Alps. In early August 1904, Irving, Mallory, and Gibson travelled to the Alps, which would be Mallory's first foray into the daunting world of high-altitude mountaineering. In his final year at Winchester, Mallory studied history instead of mathematics. After sitting his exams, he was awarded a history scholarship to Magdalene College, Cambridge, known as a sizarship.

1905–1909: Magdalene College, Cambridge
In October 1905, at the start of the Michaelmas term, Mallory entered Magdalene College, Cambridge, to study history under his tutor, Arthur Benson, the newly appointed supervisor in history at the college. During his second year at Magdalene, Mallory made several new friends outside the college. On 6 February 1907, at Christ's College, he dined with the zoologist Arthur Shipley. Other guests included his tutor, Arthur Benson and his younger brother, the clergyman Robert Hugh Benson; the physicist Charles Galton Darwin, grandson of Charles Darwin, author of On the Origin of Species; and under-librarian Charles Edward Sayle. At Sayle's house on Trumpington Street, Mallory met several undergraduates with whom he established enduring friendships; the French painter Jacques Raverat, surgeon, and author Geoffrey Keynes were among them. He also became good friends with the poet Rupert Brooke and the psychoanalyst James Strachey. On 12 February 1909, Mallory met Geoffrey Winthrop Young at the Charles Lamb Dinner in Cambridge and developed a good friendship. Through his companions James Strachey and Geoffrey Keynes, Mallory got to know their elder brothers, Lytton Strachey and John Maynard Keynes, who were members of the Bloomsbury Group. Through the Stracheys, he met and befriended their cousin, the painter Duncan Grant, also a Bloomsbury member. Among these friends, particularly Lytton Strachey, his letters attest to a flirtatious, homoerotic, and "explicitly gay" friendship.

Athletically, Mallory developed into an accomplished oarsman for his College, Magdalene. In October 1906, at the beginning of his second academic year, he was elected secretary of the Magdalene Boat Club and captain of the college boat club from 1907 to 1908. In July 1908, an eight, with Mallory rowing at number 7, was sent to compete at the Henley Royal Regatta, performing admirably in the Ladies' Challenge Plate and Thames Challenge Cup.

Politically, Mallory joined the Cambridge University Fabian Society, established in 1906, and acted as college secretary on behalf of Magdalene on the Cambridge University Women's Suffrage Association committee. The Marlowe Society, in February 1907, was established at Cambridge University; in November of that year, Doctor Faustus, its first production, was staged at the Amateur Dramatic Club Theatre; Mallory took part as the Pope and one of the Scholars; Geoffrey Keynes, the Evil Angel; Rupert Brooke, Mephistophilis; Justin Brooke, Faustus; and Cosmo Gordon, a magician.

Academically, on 26 May 1907, Mallory sat part one of the history tripos in his examinations at Magdalene, achieving a third class. In 1908, in the second part of the history tripos, he improved on the previous year, attaining a class two degree. Equipped academically with his degree, Mallory had to consider a future career. In 1907, he had consulted the deputy headmaster of Winchester, Howard Rendall, about the possibility of becoming a teacher there, but Rendall gave him a stern retort; Mallory informed his tutor at Magdalene, Arthur Benson; "He says that as I have nothing to teach and would probably teach it badly, there is not the least chance of ever getting to Winchester." Rendall, to Mallory, also suggested that he go into the church and find a good country parson who required a curate. For a time, Mallory unenthusiastically pondered following in his father's footsteps, contemplating "parish work of some kind ... I'm at variance with so many parsons that I meet. They're excessively good, most of them much better than I can ever hope to be, but their sense of goodness seems sometimes to displace their reason." Arthur Benson offered an alternative suggestion to Mallory to return to Magdalene for a fourth consecutive year, where he could improve upon his degree. Mallory returned a decisive affirmative and settled into new quarters at Pythagoras House, a short distance from Magdalene College.

In February 1909, Geoffrey Winthrop Young invited Mallory to Wales for a climbing trip at Easter. After the trip on Mallory's return to Magdalene, Young sent him an application form to fill out for membership in the Climbers' Club, and in May 1909, Mallory was elected a new member. The under-librarian, Charles Edward Sayle, announced that the subject for the Members' Prize Essay in 1909 would be James Boswell, the biographer of Samuel Johnson; and Mallory decided to compete. Upon completing his academic essay on Boswell, he submitted it to the judges, who awarded him second place, a proxime accessit. Later, with Arthur Benson's encouragement, he suggested that Mallory submit his essay for publication as a book. In October 1912, his book, Boswell the Biographer, was published by Smith, Elder & Co.

In June 1909, Mallory received a letter from the headmaster of Winchester College, Dr Hubert Burge, which communicated the possibility of a teaching job opening at Winchester at Easter 1910, in French, German, and mathematics. He travelled to Winchester and discussed the outlook, but Burge turned him down, explaining that the teaching post required too high a degree of mathematical knowledge for his academic qualifications. In July 1909, at the end of the term, Mallory's education at Magdalene was finally complete.

1909–1910: Interim
In October 1909, the painter Simon Bussy, whose wife Dorothy was the sister of Lytton and James Strachey, invited Mallory to spend the winter months with them at their villa in Roquebrune in the Alpes-Maritimes. Mallory, who had recently received a small family legacy, accepted their offer and travelled to France in early November to stay with the Bussys'. During his stay, Simon Bussy painted a portrait of Mallory, which the National Portrait Gallery later acquired. Near the end of February 1910, Mallory left Roquebrune and travelled to Italy, where he visited the cities of Florence, Pisa, Milan, and Genoa. In mid-March, he travelled to stay in Paris, stopping to visit two Cambridge friends, Hugh Wilson in Basel, Switzerland, and Jacques Raverat in Prunoy, France. Upon his arrival in Paris, Mallory rented a room at 52 Rue Gay Lussac, a short distance from the Jardin du Luxembourg. He stayed in Paris for one month, seizing the opportunity to improve his French language and linguistic proficiency by reading, attending the theatre and music hall, attending Sorbonne lectures, and conversing.

In April 1910, Mallory returned to Cambridge, contemplating his future career prospects. At the beginning of May, he took a temporary teaching post at the Royal Naval College, Dartmouth, which lasted two weeks. In July 1910, Mallory received a letter from the headmaster of Charterhouse, Gerald Henry Rendall, offering a job teaching Latin, mathematics, history, and French, and hoped it possible that he could teach history to students who were candidates for scholarships to Cambridge and Oxford, on a probationary basis, with an annual salary of £270, which he promptly accepted.

1910–1914: Charterhouse School
In September 1910, at the start of the Michaelmas term, Mallory began teaching at Charterhouse, one of England's excellent public schools, as an assistant headmaster and took up residence with two colleagues at Nercwys House. One of the problems he faced as a teacher was his highly youthful appearance, and consequently often misperceived by their parents as one of the students. His teaching methods relied on infectious enthusiasm and avuncular mannerisms rather than imposing his authority. He followed the teaching styles of Robert Lock Graham Irving and Arthur Benson, who sought to educate through mutual respect and trust, getting to know their pupils as individuals and repudiating the authoritarian regimes of most British public schools. Several of Mallory's colleagues developed a hostile attitude towards him due to his informal approach to teaching methods, which they considered undermining their attempts to maintain discipline. He recommended that his students read literature extensively, write essays on subjects such as hypocrisy, candour, and popularity, and he engaged with them in discussions of politics and literature. He also took them on out-of-school excursions to places of aesthetic scenery and landmarks of architectural importance.

The poet Robert Graves, a student at Charterhouse from 1909 to 1914, said Mallory was the most exemplary teacher and the first genuine friend he ever had. In his autobiography, Goodbye to All That, Graves wrote fondly of Mallory, who encouraged him in his interest in literature and poetry and, during the school vacations, took him climbing in Snowdon. Robert Lock Graham Irving and Geoffrey Winthrop Young proposed Mallory for the Alpine Club, and in December 1910, he was elected a new member. During the summer of 1913, Mallory collaborated with Robert Graves and two other Charterhouse students, Cyril Hartmann and Raymond Rodakowski, to produce a new school magazine called Green Chartreuse, intended to rival other school magazines, The Carthusian and The Greyfriar, with its first publication appearing on Old Carthusian Day, 5 July 1913. Mallory presented a series of lectures on Italian painting at Charterhouse in the spring of 1914, engaging the students in a "rather philosophical" discussion about Botticelli, Michelangelo, and Raphael.

'My dearest Ruth,'
Christiana Ruth Turner (1891–1942) was the second daughter of prosperous architect Hugh Thackeray Turner (1853–1937) and Mary Elizabeth Turner (née Powell; 1854–1907), who passed away after developing pneumonia when Ruth was fifteen. She had two siblings, Marjorie (1890–1972) and Mildred (1893–1985), and resided with her father and sisters at Westbrook House, an elegant mansion built by their father near Godalming, Surrey. Mallory and Christiana Ruth Turner met for the first time in the autumn of 1913 at a dinner hosted by Arthur Clutton-Brock at his residence on Hindhead Road (later renamed Frith Hill Road), Godalming, Surrey. Ruth's father, Thackeray Turner, invited Mallory to their home at Westbrook to play billiards and go walking. From Mallory, invitations were sent to the Turner family at Westbrook to take part in a play reading at Charterhouse, where he, Ruth, and her sisters, Marjorie and Mildred, acted in a garden performance of The Princess. Mallory and the Turner family developed a close friendship, and he became a regular visitor to their dwelling at Westbrook. In March of 1914, Thackeray Turner and his three daughters were on a family holiday in Italy, and he invited Mallory to join them there. He travelled to Italy and, on 3 April, rendezvoused with the Turners at a train station in Verona, from where they journeyed to Venice, where he spent the ensuing week in their company, during which time he and Ruth fell precipitately in love. On 1 May 1914, at Westbrook, Mallory and Ruth became engaged to be married. Thackery Turner felt that Mallory's schoolmaster's income was inadequate to support Ruth in the manner customary for her, and he provided his daughter with an annual income of £750, to which Mallory consented. For them, he also purchased a six-bedroom house, costing £1600, named The Holt, situated on Hindhead Road (later renamed Frith Hill Road), Godalming, Surrey. On 29 July 2014, six days before Britain entered the First World War, Mallory and Ruth were married in Godalming, with Mallory's father, Herbert, performing the ceremony and Geoffrey Winthrop Young acting as best man. Mallory and Ruth had two daughters and a son: Frances Clare (1915–2001), Beridge Ruth, known as "Berry" (1917–1953), and John (1920–2011).

Schoolmasters exemption
Mallory's inquiries about enlisting in the military were met with strong resistance by the headmaster of Charterhouse, Frank Fletcher. Fletcher, chairman of a committee of the Headmasters' Conference asked the government for a policy concerning the enlistment of schoolmasters. On 9 December 1914, Lord Kitchener replied from the War Office, instructing headmasters to implement discretion and judgement in deciding which teachers could be permitted to enlist without diminishing the work of their schools and the training of the Officers' Training Corps. In March 1915, due to Fletcher's objections, Mallory was denied the opportunity to work with William Arnold-Forster, who ran an anti-contraband department at the Admiralty. A pamphlet, composed by Mallory, entitled War Work for Boys and Girls, was intended to teach schoolchildren the ideals of international understanding and the "good life" for every nation and individual from all backgrounds. These ideals, he believed, could only be achieved with an education encouraging the growth of the spirit and self-discipline; and to boys and girls curious about how they could support the war effort, they were encouraged to foster the development of clear thought, devoting themselves to acquire knowledge in "learning what is right for England."

Military training
In May 1915, two friends of Mallory, Eddie Marsh and Will Arnold-Forster, travelled to visit him in Godalming and suggested that, though over age, he should try for a commission in the Royal Naval Air Service. Given Kitchener's policy, Fletcher opposed it, stating, "I cannot consent to your going," denying Mallory's opportunism. In December 1915, aided by his brother-in-law, Ralph Brooke, an instructor at Woolwich Common, Mallory was commissioned as a second lieutenant in the Royal Garrison Artillery. In a letter to a friend in charge of running an artillery training course at Weymouth Camp, Brooke had recommended Mallory based on his expertise in mathematics and trigonometry. Fletcher's persistence finally relented, granting Mallory leave, as the initiative coincided with his finding of a teacher who took Mallory's post at Charterhouse. In January 1916, Mallory commenced a training course involving artillery training at Weymouth Camp for subalterns who might prove competent for further training at Lydd Military Training Camp in Kent. On 1 April 1916, Mallory journeyed from Weymouth to Lydd for additional training at the School of Siege Artillery at Lydd Camp and received instructions on utilising heavy howitzers.

Active military duty
During the night of 4 May 1916, Mallory travelled across the English Channel, and arrived in the early morning at Le Havre, France. After arriving, he spent a week at No. 1 General Base Depot for Royal Garrison Artillery, near Le Havre, undergoing final preparations for active military service, including training in using a gas mask and shooting practice with his new revolver. After the culmination of his preparations for active duty, Mallory took a troop train from Rouen northeast to Armentières. When he reported to headquarters, he was assigned to the 40th Siege Battery, operating north of Armentières, in the northern section of the Western Front, a short distance from the front line, in a unit of four-six-inch howitzers eight miles south of the Ypres Salient. The commanding officer of the 40th Siege Battery was a Scotsman, Captain James Lithgow. Lieutenant D.A. Bell was second in command, with Mallory third as a second lieutenant. Bell was in charge of No. 4 gun detachment and shared a billet with Mallory. Some of Mallory's duties consisted of taking charge of the firing of the howitzers and being positioned at observation posts. During his first night at an observation post near the front line, a bullet passed between him and a soldier who was in very close proximity to his position. On 24 May 1916, a German shell destroyed the rear of the cottage he shared with Lieutenant Bell; fortunately, Mallory's room was undamaged. Ruth dispatched him food and provisions from England, including potatoes and butter, sausages, tea, whisky, gin, Turkish cigarettes, matches, newspapers, books, clothes, pencils, and notebooks.

Battle of the Somme
On 29 May 1916, the 40th Siege Battery deployed south. After several days of bombardment at Vimy, they travelled farther south, rejoined the other half of the battery, and occupied a new position in Picardy just north of the river Somme, at Pioneer Road, near Albert, by mid-June. Mallory lived in a dugout excavated into the chalk terrain. Below ground was the stench of rats and the malodorous scent of decay; above ground was the smell of sweat and cordite. Mallory's 40th Siege Battery unit was allied with the 30th Heavy Artillery Group and the 2nd Corps Heavy Artillery. On 24 June 1916, the artillery bombardment preliminary to the Somme offensive, initiated by the Allies, began with Mallory, Lieutenant Bell, and their crews bombarding particular villages and German trenches with shells in four-hour shifts for seven consecutive days. On 1 July 1916, the Battle of the Somme began with British and French infantries attacking the Germans along the Somme. The 40th Siege Battery's primary duty was to fire a lifting barrage at the opposing force. On 11 July 1916, just before the beginning of the second phase of the offensive, Mallory was ordered to the trenches, where he occupied an observation post for three days, aided by two Scottish signallers. His assignment was to register artillery fire on a distant windmill at 8,500 yards, east of Pozières. On 15 July 1916, he observed for the first time the devastating and gruesome effects of flamethrowers when used by the French against enemy soldiers. On 28 July 1916, two men from Mallory's unit, the 40th Siege Battery, Scots, Alexander Craig and John Cameron Forrest, were killed instantly by an exploding shell as they were walking a short distance behind Mallory and the rest of his party while returning from observation duty in the trenches.

In mid-August 1916, Captain Lithgow succumbed to bed rest due to a fever, and Lieutenant Bell took leave, with four days rest, giving Mallory command of the battery for a few days. On 17 August 1916, by orders, he was sent to a rest camp for a ten-day sojourn near Amiens, where he lived in a tent and mingled with several Army Service Corps officers in their mess. On 27 August 1916, Mallory returned to active military duty with the 40th Siege Battery, inhabiting his dugout, which he called "Fathom Five." The entire place had an infestation of rats and mice; he discovered lice in his clothing, and the water supply was foul for a period. On 15 September 1916, the Battle of Flers–Courcelette began. As the advance on the Flers Line persisted, Mallory, positioned in a forward observation post, spent as much time as possible there and saw little of the other officers in the battery. On 18 October 1916, the 40th Siege Battery progressed to new quarters seized from the Germans. With the onset of one of the most extreme European winters in living memory, the bitter cold set in, with daytime temperatures seldom exceeding four degrees Celsius and merciless rain, which turned the entire place into a quagmire, reducing artillery warfare to a minimum. On 29 October 1916, Robert Graves wrote to Eddie Marsh, informing him that Mallory did not have leave for six months. On 30 October 1916, rain played havoc, flooding Mallory's dugout. On 18 November 1916, Douglas Haig, commander in chief of the British forces in France, called a halt to the Somme offensive.

Military leave and return to France
On 9 December 1916, aided by the interposition of Eddie Marsh, Mallory was granted military leave. A few days later, he was at home in England, spending ten days at Westbrook House with his wife Ruth and daughter Clare before returning to France on Boxing Day. After reporting for military service, he was reassigned as an orderly officer, serving as a colonel's assistant at the 30th Heavy Artillery Group headquarters, three miles behind the front line, for the first weeks of 1917. At the beginning of February 1917, the command recommended Mallory for a staff lieutenancy; he rejected it and was instead assigned a liaison officer position to a French unit. At the end of March 1917, he applied to rejoin the 40th Siege Battery, which had moved to a new location. On 7 April 1917, during the prelude to the Battle of Arras, he was back at the front with the 40th Siege Battery in an exposed observation post, directing artillery fire.

Surgery
Mallory increasingly experienced right ankle pain after returning to France in December 1916, which made walking difficult. A doctor's medical diagnosis concluded that the injury he sustained in a fall in Birkenhead, Cheshire, in 1909 was a fracture, which was left untreated, had failed to heal properly, and was causing the pain. He returned to the front under advisement to use bandages for supporting his ankle, continued to suffer pain, and after re-examining by a doctor informed, it necessitated an operation to further his duty in the British Army. Invalided out of the armed forces, Mallory was sent home to England in May 1917 and underwent a surgical operation on his right ankle that month in the Officers' Hospital, Portland Place, London.

Further military training
In September 1917, the army medics passed Mallory fit to resume active duty. He was sent, under new orders, to Avington Park Camp near Winchester, was transferred from the Siege Battery to a Heavy Battery, and trained at the camp with the Royal Artillery's new generation of 60-pounder heavy guns, which had a maximum firing range of about 12300 yd. In October 1917, Mallory obtained exalted military status; he was advanced to the rank of lieutenant and commenced a training course for newly promoted officers at Avington Park Camp. On 8 October 1917, Mallory was travelling to Avington Park Camp on a motorcycle he had borrowed from a Winchester teacher when he collided with a gatepost at the entrance to the camp and crushed his right foot. He explained to Ruth, "As I turned into the camp, my brake, which I endeavoured to apply as I hadn't quite sufficiently slowed down, failed to act." As a repercussion of the motorcycle accident, he spent a week in a hospital, was discharged on 16 October 1917, and, although moderately debilitated, returned to Avington Park Camp, where he completed his training course. At the end of December 1917, Mallory was again passed fit for military service. He fully anticipated being sent back to France but was ordered to undergo a battery commanders' course at the School of Siege Artillery at Lydd Military Training Camp in Kent under his brother-in-law Ralph Brooke, the commanding officer of the course.

Second return to France
On 23 September 1918, after completing a final training course at Newcastle, Mallory crossed the English Channel to Calais, France, and was reassigned to the 515th Siege Battery, stationed between Arras and the French coast. His commanding officer was Major Gwilym Lloyd George, the second son of British Prime Minister David Lloyd George. The battery was positioned a safe distance from the front line and expected to conduct military operations with an airborne observer but found little opportunity for activity. The 515th Siege Battery was assigned two 14-inch Mark I guns, shipped to France in sections, intended to be assembled and utilised as super-heavy railway guns; the first arrived in September 1918, the second after the Armistice; neither saw any action. On 29 September 1918, the Allied forces successfully breached the Hindenburg Line, a pivotal moment that turned the tide dramatically in favour of the Allies. The German government's request for an armistice, dated 4 October 1918, was forwarded to Washington, D.C., United States, via Switzerland on 5 October 1918. On 3 November 1918, Mallory's commanding officer, Major Gwilym Lloyd George, received a directive to join his father in Versailles, Paris. On 10 November 1918, Mallory was at a casualty clearing station near Cambrai with his friend and compatriot, Geoffrey Keynes, a surgical specialist. That night, as they were turning in for sleep in Keynes's bell tent, they heard shouts, from which they discerned an armistice was imminent. On 11 November 1918, at 5:00a.m. (French time), the Allies and Germany signed the Armistice. The Allied and German plenipotentiaries' signatories were Ferdinand Foch, Rosslyn Wemyss, Matthias Erzberger, Alfred von Oberndorff, Detlof von Winterfeldt, and Ernst Vanselow, at 5:10a.m., with 5:00a.m. agreed upon as the official time of signing. On the evening of 11 November 1918, at the officers' club in Cambrai, Mallory celebrated peace with his brother Trafford. Due to the British requirement to demobilise more than a million men after the armistice and the dearth of ships that could transport them across the English Channel, Mallory did not return to England until the second week of January 1919.

Return to Charterhouse School
Following his return from France, Mallory, Ruth, and their two young daughters, Frances Clare and Beridge Ruth, who had been residing at Westbrook House, re-established themselves by returning to live in their previous residence, The Holt in Godalming, Surrey. At the end of January 1919, Mallory resumed his prior teaching position at Charterhouse, where he now taught predominantly English and partly history. He was able to transcend his grievances and disdain for Frank Fletcher, the headmaster of Charterhouse, owing to the elation of his first six months back home, but still held strong convictions about the deficiencies and shortcomings of the public school. Deep down, he felt dissatisfied as a schoolmaster, devoting more attention to mountaineering issues, the direction of international politics, and the fundamental objectives of education, and pondering how he could find more time for writing. In collaboration, Mallory, with his friends Geoffrey Winthrop Young and David Randall Pye, contemplated establishing a school and met several times at the Holt to discuss the concept. Mallory prepared a draft prospectus for the school consisting of critical points that emphasised its core principles and ideals and, along with Young and Pye, created more in-depth plans. Ultimately, they lacked the collective motivation to follow the scheme, resulting in an obsolete conceptualisation. Through his teachings at Charterhouse, Mallory strived to advance an understanding of contemporary political issues and the development of an improved world, which he considered the conflict of World War I had been fought for, vanquishing the enemy. The League of Nations' initial meetings inspired him, and he promoted a new brand of patriotism in one of his lectures.

On 14 June 1920, Mallory wrote a speculative letter to Gilbert Murray, an activist, the Regius Professor of Greek at Oxford University, and secretary of the League of Nations Union, a voluntary organisation established to support the League of Nations. In his letter to Murray, Mallory queried whether the Union could find any use for his services and communicated his preparedness to resign from his current employment at Charterhouse. The letter also cited his experience as a historian and lecturer, his interest in writing and literature, and, most importantly, his passion for international politics. Mallory's eagerness was apparent in the letter, as he offered to meet Murray in Oxford; and had informed Frank Fletcher that, if his application was successful, he might leave Charterhouse when the summer term concluded, but in the end, nothing came of his approach to Murray.

Trip to Ireland
During the Christmas holidays of December 1920, Mallory arrived by mailboat at the Royal Harbour Of George The IV, renamed Dún Laoghaire Harbour in 1924, in County Dublin, the Irish Republic, and boarded a train that brought him to the centre of Dublin City. Mallory's objective in Ireland was to gain first-hand knowledge of the realities of life during the Anglo-Irish War, which was raging at the time of his visit. Although his objective is clear, his incentive is unknown. The British, who had refined their black propaganda techniques throughout World War I, were proficient at propagating atrocity stories about the Irish republican movement, and Mallory proclaimed he wanted to discover the truth. There are two motives posited for Mallory's objective in Ireland. He and Ruth had resolved that he should leave Charterhouse, so it is conceivable that he was considering the possibility of a career as a writer, and the trip to Ireland allowed him to gain experience as a reporter. A possible request to Mallory from Gilbert Murray, secretary of the League of Nations Union, to provide him with a first-hand account of what had become recognised in British liberal circles as "the terror in Ireland" was also a likely motive for Mallory to travel to Ireland. Conor O'Brien, a yachtsman and Mallory's friend and fellow climber, who had assisted in landing firearms for the Irish Volunteers in 1914, was consequently a priceless asset for his visit in the form of a valuable contact, whether Mallory was acting as a journalist or political consultant. O'Brien introduced Mallory to prominent figures, Irish republican Erskine Childers, author of The Riddle of the Sands, and Irish nationalist Desmond FitzGerald, "director of propaganda" at Dáil Éireann. FitzGerald provided Mallory with a pass by inscribing, "Mr G. Mallory is anxious to have first-hand information as to acts of oppression and terror. I shall be glad if he can be assisted," on the rear side of an identification photograph of Mallory, effectively granting him official authorisation. Throughout the week he spent in Dublin, Mallory progressively experienced his sympathies shifting towards a people determined to fight for their independence and became familiar with the pernicious fear impacting the city. Aware of the risks, Mallory maintained an inconspicuous approach: concealed his notes before going out in public, kept his hands free from his pockets, eschewed the notorious Black and Tans, knocked on his friends' doors in an audible yet unsuspicious manner, and avoided running for fear of appearing to be someone attempting to flee. He was awakened one night in his lodgings at 1:30a.m. and interrogated by a stranger brandishing a revolver in one hand and holding a flashlight in the other, demanding to know who he was, what his name was, where he was born, and whether or not he was a Protestant. Mallory witnessed the body of a young child whom impetuous British troops had slain. His Irish contacts accompanied him on a trip into the countryside, where he met the relatives of republicans who had perished battling the British and learned about the Black and Tans' summary executions. Even though he acknowledged injustices on both sides, ultimately, he expressed empathy for the Irish in their struggle for independence. Mallory returned to London during the early days of January 1921.

Resignation from Charterhouse and the lure of Everest
In January 1921, representatives of the Royal Geographical Society and the Alpine Club jointly established the Mount Everest Committee to organise and finance an expedition to Mount Everest. The committee consisted of four RGS members and four Alpine Club members; from the RGS were Sir Francis Younghusband, Arthur Robert Hinks, Edward Lygon Somers-Cocks, and Colonel Evan Maclean Jack; from the Alpine Club were Professor John Norman Collie, John Percy Farrar, Charles Francis Meade, and John Edward Caldwell Eaton. The committee's primary objective in 1921 was a thorough reconnaissance of the mountain and its approaches to determine the most viable route to the summit, and in 1922 to return for a second expedition, using this route for an all-out attempt to reach the summit. On 23 January 1921, Mallory received written correspondence from John Percy Farrar, secretary of the Alpine Club, its former president and the nascent Mount Everest Committee member. In the letter, Farrar asked Mallory if he would be interested in participating in an expedition to Everest: "It appears an attempt on Everest will occur this summer. The party would depart in early April and return in October. Any ambitions?" Although grateful for the invitation, Mallory initially felt reluctant to accept it, knowing that his participation would mean a lengthy separation from his wife and young children, and he also expressed scepticism regarding the viability of the expedition. Geoffrey Winthrop Young visited him at the Holt, Godalming when he learned of his hesitance and swiftly persuaded him and Ruth not to disregard the opportunity, saying that it would be an incredible adventure and earn him reputable renown for prospects in future professions as an educator or writer. Young's arguments convinced Ruth, and she concurred that Mallory should join the expedition; realising it was "the opportunity of a lifetime," Mallory ultimately decided to participate. On 9 February 1921, in Mayfair, London, Mallory met with Sir Francis Younghusband, chairman of the Mount Everest Committee; John Percy Farrar, a committee member; and Harold Raeburn, the assigned mountaineering leader of the 1921 British Mount Everest reconnaissance expedition. At the meeting, Younghusband formally invited Mallory to join the expedition and was surprised to observe that he accepted without any evident emotion and exhibited no indication that he was brimming with enthusiasm. In February 1921, Mallory officially tendered his resignation from his mastership at Charterhouse, changing his previous intended decision of resigning at the end of the summer term.

On 17 March 1921, Mallory underwent a medical evaluation in Harley Street, London, concerning his designation as a member of the 1921 expedition. He passed physically and physiologically fit on all the required assessment criteria and had a well-developed physique, with his height and weight documented at 5 ft and 11 st, respectively. George Finch, whom the Mount Everest Committee had selected as one of the expedition mountaineers, was also given a medical examination on 17 March 1921. He was declared unfit, and with Mallory's recommendation, the committee chose Guy Bullock as his replacement. On 8 April 1921, Mallory departed from the Port of Tilbury in Essex, England, on board SS Sardinia, and brought the final shipment of expedition supplies. It was a solitary voyage, as the other expedition members had theretofore departed or were already in India. To remain in adequate physical condition while travelling, he frequently ran around the deck and discovered a hidden place in the bows, where, in solitariness, he read Charles Dickens Martin Chuzzlewit and Lytton Strachey's Queen Victoria. On 9 May 1921, Sardinia docked in Calcutta, India. Mallory travelled by train north to Darjeeling, where he joined the rest of the expedition members at Government House (Raj Bhavan). On 11 May 1921, Lord Ronaldshay, the Governor of Bengal, hosted a formal banquet in their honour. On 29 October 1921, following the culmination of the 1921 reconnaissance expedition, Mallory departed from Bombay, India, on board SS Malwa. On 9 November 1921, Sir Francis Younghusband wrote a letter to Mallory requesting that he participate in the second expedition to Everest in 1922. He also expressed that waiting until 1923 was not an alternative option because they could not afford to squander the opportunity that the current benevolence of the Tibetans presented. This letter awaited him in Marseille, France, the port of call for Malwa. Before reaching Marseille, Mallory wrote a letter to his sister Annie Victoria (Avie), expressing reservations about returning to Everest in 1922. On 12 November 1921, the same day Malwa docked in Marseille, Mallory wrote a letter to Arthur Robert Hinks, deferring his decision to join the 1922 Expedition. His wife Ruth awaited him in Marseille, where they spent a brief holiday touring Provence and visiting the Pont du Gard while staying at the Hôtel Louvre et Paix. Mallory and Ruth carefully discussed the circumstances concerning his participation in the 1922 expedition during their holiday in Provence and concluded that he should not decline the opportunity. On 16 November 1921, Mallory wrote a letter to Hinks elucidating his position. On 25 November 1921, they arrived at their residence, the Holt, in Godalming. A few days after his return home, Mallory met Hinks in London and, within a week, was included on a list of mountaineers who assented to participate in the 1922 expedition.

Public lectures, writing, and preparations for the 1922 British Mount Everest expedition
On 20 December 1921, in the Queen's Hall, London, Mallory and Charles Howard-Bury delivered a narrative on the 1921 reconnaissance expedition at a combined meeting of the Royal Geographical Society and the Alpine Club. In exchange for a quarter of the revenue earned, the Mount Everest Committee requested that Mallory deliver a series of lectures throughout Britain and contribute to the official expedition book, Mount Everest: The Reconnaissance, 1921. On 10 January 1922, Mallory delivered his initial public speech in the Queen's Hall and thenceforth journeyed extensively around Britain, filling approximately thirty lecture engagements. On 20 February 1922, his lecture tour officially concluded with a talk in Newcastle, followed by one further lecture at Winchester College. The financial results of his lecture tour were lucrative, as his twenty-five per cent share earned him £400, which exceeded his annual salary as a Charterhouse teacher. Preceding his departure for the 1922 British Mount Everest expedition, Mallory completed his written contribution to the book Mount Everest: The Reconnaissance, 1921, titled The Reconnaissance Of The Mountain, consisting of six chapters: The Northern Approach, The Northern Approach (continued), The Eastern Approach, The Assault, Weather And Conditions Of Snow and The Route To The Summit. Mallory and Ruth evaluated his share of the profits for his contribution to the book. Furthermore, he reviewed expedition equipment and assisted the Mount Everest Committee in preparations for the 1922 expedition.

Itinerary for the 1922 British Mount Everest expedition
On 2 March 1922, Mallory, Howard Somervell, John Noel, Edward Strutt, George Finch, and Arthur Wakefield, destined for the 1922 British Mount Everest expedition, crossed the English Channel from Folkestone to Boulogne, then travelled by train south to Marseille, from where they departed on board the P&O passenger liner Caledonia (1894) on 3 March 1922. Mallory engaged in deck tennis with Somervell and Wakefield and attended Finch's oxygen class, which enabled him to overcome initial his ambivalence about its implementation. During the voyage to India, Caledonia docked in the Port of Aden, where Somervell disembarked, ascended a nearby mountain, and then returned and boarded the vessel before her departure. On 17 March 1922, Caledonia reached her port of call, berthing in Bombay, India. They travelled across India by train from Bombay, arriving in Darjeeling on 20 March 1922, where they coalesced with the rest of the expedition. The expedition members left Darjeeling in groups for the march to Phari. On 26 March 1922, Mallory's group departed Darjeeling with and under expedition leader General Charles Granville Bruce, arriving in Phari on 6 April 1922 and joined the following day by the remainder of the expedition. On 24 April 1922, they reached Shelkar and arrived at the Rongbuk Monastery on 30 April 1922. On 1 May 1922, the expedition pitched Base Camp at an altitude of 5029 m, 2.75 mi below the junction of the Rongbuk Glacier and East Rongbuk Glacier. On 5 August 1922, following the cessation of the 1922 expedition, Mallory departed from India, voyaging by ship, and arrived in England in mid-August 1922.

Announcement of a third expedition, public lectures, and writing
The announcement that the Tibetan government had formally authorised the third expedition to Mount Everest came on 16 October 1922 at a combined meeting of the Royal Geographical Society and the Alpine Club at Central Hall, City of Westminster, London. In October 1922, the Mount Everest Committee resolved that the third expedition to Mount Everest would commence in the spring of 1924, again under the leadership of General Charles Granville Bruce. The committee was eager to generate money to cover some of the 1924 expedition's costs and discussed terms for a comprehensive lecture programme with Gerald Christie, the agent who had previously represented them in 1921. Following the conclusion of the negotiations, a large-scale lecture tour was organised, with Mallory and George Finch selected as the two public speakers. On 20 October 1922, Mallory and Finch at the Central Hall, City of Westminster, delivered their first public lectures concerning the 1922 expedition, including photo illustrations, at 3:00p.m. and 8:30p.m., respectively. During the winter, Mallory presented an extensive round of talks throughout Britain and the island of Ireland, filling engagements in places such as Aberdeen, Torquay, Brighton, and Dublin, receiving thirty per cent of the proceeds, earning £75 in November 1922, £225 in December 1922, and £100 in early January 1923. In addition to authoring Everest and Himalaya-related articles for periodicals and encyclopaedias to supplement his income, the committee requested that he contribute to the official book of the 1922 expedition, The Assault on Mount Everest: 1922.

Lecture tour of the United States, Canada, and writing
The Mount Everest Committee formulated arrangements for Mallory to travel to the United States and Canada on a three-month lecture tour, and under the recommendation of Gerald Christie, the committee chose Lee Keedick of New York to serve as the tour manager. Mallory and Ruth concurred that he should strive for steady employment when he returned from the United States. In mid-January 1923, Mallory embarked on a journey across the Atlantic to the United States on board RMS Titanic's sister ship, RMS Olympic, where she docked in New York on 17 January 1923. After meeting his lecture agent, Keedick, Mallory was dismayed that Keedick had arranged only a meagre number of lecture engagements, and according to the schedule, he had to wait nine days to deliver his first public speech. During his free time, he amended his lecture materials to improve impressions for his audiences and wrote his finalised contribution to the 1922 expedition book, The Assault on Mount Everest: 1922. His first contribution was titled The First Attempt, consisting of three chapters: The Problem, The Highest Camp, and The Highest Point, and his second, The Third Attempt, had two chapters: The Third Attempt and Conclusions. On 26 January 1923, in Washington, D.C., Mallory delivered two lectures, one in the afternoon and one in the evening, which grossed $1000. His next engagement was in Philadelphia, where he delivered two separate lectures for a combined audience of approximately 3000, grossing $1500. After a comprehensive evaluation by medical professionals at the Presbyterian Hospital when he returned to New York, they determined that his lung capacity was twofold that of the average person. On 4 February 1923, Mallory gave a lecture at the Broadhurst Theatre, New York, in front of an audience of some 550, filling only half of the 1100 seating capacity in the auditorium, resulting in a loss of money. The next day, 5 February 1923, The New York Times ran a story under the headline, SAYS BRANDY AIDED MT EVEREST PARTY; A Swig 27,000 Feet Up 'Cheered Us All Up Wonderfully,' Mallory Tells Audience, which in effect diverted its coverage of the lecture tour into anti-prohibition propaganda. Mallory travelled by train from New York to Canada, where he had lectures scheduled in Toronto and Montreal. The Toronto appointment resulted in a cancellation, whereas the Montreal appearance grossed a meagre $48. In Boston, he delivered a lecture to members of the Appalachian Mountain Club, gave a further speech in Cambridge, made a second visit to Philadelphia, where he at the University Museum, spoke to an audience of 1200, and delivered additional lectures in Toledo, Rochester, Iowa City, and Hanover before filling a second and final engagement in Boston. Under the headline, CLIMBING MOUNT EVEREST IS WORK FOR SUPERMEN, The New York Times of 18 March 1923 quoted Mallory as having replied to the question, "Why did you want to climb Mount Everest?" with the retort, "Because it's there." The expression describes an existential desire to accomplish a physical and spiritual goal that all mountaineers share. Questions have arisen over the quote's authenticity and whether Mallory said it. Some have suggested that it was an innovative paraphrase created by the newspaper reporter. The lecture tour was a financial failure; Mallory regretted that he, Ruth, and the children would have to live on less money than he had anticipated generating for some time because he had no immediate prospects for permanent employment. On 31 March 1923, Mallory departed New York on board Saxonia, destined for England, where she docked in Plymouth in early April 1923.

New job as a lecturer with the Board of Extra-Mural Studies
When the Reverend David Cranage, Secretary of the Board of Extra-Mural Studies (BEMS) at the department of the University of Cambridge, and Arthur Robert Hinks of the Mount Everest Committee travelled together on a train from London to Cambridge while Mallory was still in America, it marked the initiation of his future employment prospects. Cranage advertised a vacancy for a history lecturer to educate in towns and villages outside of Cambridge and assist in organising other extra-mural courses. The hired individual would conduct lectures in cooperation with the Workers' Educational Association (WEA), established in the early years of the labour movement, to support working people who had missed the opportunity for education in favour of the privileged. During the train journey, Cranage apprised Hinks about the available job and questioned whether he knew of any possible candidates, and Hinks suggested Mallory. Hinks informed Mallory of the Cambridge extra-mural lecture vacancy soon after Mallory had arrived back in England. On 20 April 1923, Mallory applied for the position and, following a successful interview on 8 May 1923, was appointed on 18 May 1923. The occupation provided an annual income of £350, supplemented by separate lecture fees of approximately £150 yearly. At the end of June 1923, necessitated by the location of his new job, Mallory took lodgings in West Road, Cambridge, leaving Ruth and the children at the Holt, Godalming, until he could find a suitable new residence. Soon after moving into his rented accommodation, he found the family a new dwelling, Herschel House on Herschel Road, Cambridge. Ruth's father, Hugh Thackeray Turner, provided the money for the house, a sixty-eight-year lease costing £4000, under the stipulation that the lease was in Ruth's name. Mallory immersed himself in his new employment with great zeal, assisted with organising the Golden Jubilee of Cambridge Local Lectures in July 1923, and helped arrange the summer schools during the Long Vacation. In the fall of 1923, he commenced a sequence of lectures in Hunstanton on the emergence of contemporary democracy in the 17th century; in Raunds, tutorial classes in modern history; and also conducted classes in Halstead. On 18 October 1923, Arthur Robert Hinks wrote to the Reverend David Cranage, requesting that Mallory obtain leave from the university to participate in the 1924 British Mount Everest expedition. On 24 October 1923, the Lecture Committee at Cambridge, not eschewing the request, unanimously recommended six months' leave at half pay for Mallory, pending the formal approval of a comprehensive syndicate meeting. On 28 October 1923, the Mallorys took up residence at their new dwelling, Herschel House. On 31 October 1923, the lecture syndicate officially authorised Mallory's leave under the conditions recommended by the Lecture Committee.

Olympic medal and third Everest expedition
On 6 November 1923, after a medical examination by a physician recommended by the Mount Everest Committee, Mallory was declared "fit in every respect," eliminating the last remaining potential obstacle between him and his participation in the 1924 expedition. On 5 February 1924, at the closing ceremony of the inaugural Winter Olympics, hosted in Chamonix, France, Pierre de Coubertin presented 13 gold medals for alpinism in recognition of the achievements of the 1922 British Mount Everest expedition members to Lt Col Edward Strutt, deputy leader of the expedition. On 13 February 1924, Mallory committed himself to the 1924 British Mount Everest expedition by signing an official agreement with the Mount Everest Committee. On 29 February 1924, he and three other 1924 British Mount Everest expedition members, Andrew Irvine, Bentley Beetham, and John de Vars Hazard, departed from Liverpool on board SS California, destined for the third Everest expedition. During the voyage to India, Mallory read Maurois's Ariel, studied Hindustani, and worked through the logistics of supplies and aspects of the organisation for the expedition. Determined to remain physically healthy, he exercised regularly in the gymnasium, threw a medicine ball with Irvine and Beetham, and periodically ran ten laps around the deck. In mid-March 1924, California arrived at her destination, berthing in Bombay, India. Mallory, Irvine, Beetham, and Hazard travelled across India by train from Bombay to Darjeeling, where they rendezvoused with the other expedition participants. On 25 March 1924, the entire expedition departed Darjeeling for the march to Everest Base Camp. The trek of some 350 mi took them from Darjeeling to Kalimpong, Guatong, Jelep La, Yatung, Phari, Tang La, Donka La, Kampa Dzong, Tinki Dzong, Tinki La, Chiblung, Shekar Dzong, Chödzong, and Rongbuk, and they arrived at Base Camp on 29 April 1924, at an altitude of 5120 m.

In England
Mallory's first rock climbing experience in England transpired during a nine-day excursion to the Lake District in September 1908 with Geoffrey Keynes, Harry Olivier Sumner Gibson, and Harold Edward Lionel Porter (1886–1973), where they took lodgings at Wasdale Head. Mallory and Keynes climbed together predominantly, while Gibson and Porter joined them on some climbs. Their initial climb was Kern Knotts Crack on Great Gable, at 21.336 m and graded Mild Very Severe, with success, and first ascended by Owen Glynne Jones and Hubert Cecil Bowen on 28 April 1897. The following day they climbed Napes Needle, the famous rock pinnacle on Great Gable, at 17 m, graded Very Difficult and first climbed by Walter Parry Haskett Smith (solo) in June 1886. Also on Great Gable, they climbed Eagle's Nest Ridge Direct at 50 m and graded Mild Very Severe, with the first ascent achieved by George Percival Baker, William Cecil Slingsby, Godfrey Allan Solly, and William Anderton Brigg on 15 April 1892. They accomplished a successful ascent of North Climb on Pillar Rock, at 97.536 m, graded Hard Difficult and initially ascended by Walter Parry Haskett Smith, Geoffrey Hastings, and William Cecil Slingsby on 27 July 1891. On Scafell, they climbed two challenging routes: Slingsby's Chimney, at 21 m, graded Difficult and first ascended by William Cecil Slingsby, Geoffrey Hastings, Edward Hopkinson, and Walter Parry Haskett Smith, on 15 July 1888; and Keswick Brothers' Climb, at 74 m, graded Very Difficult and first climbed by George Dixon Abraham, Ashley Perry Abraham, and James William Puttrell, on 12 July 1897. On 21 September 1908, they claimed two new routes on the Ennerdale face of Great Gable: Mallory's Left-Hand Route, at 30 m, graded Very Difficult, and Mallory's Right-Hand Route, at 37 m, graded Mild Very Severe. In August 1913, Mallory and Geoffrey Winthrop Young achieved a new route, Pinnacle Traverse, at 60 m, graded Difficult, on the crag, Carn Lés Boel, in Cornwall, England. On 7 September 1913, Mallory and Alan Goodfellow, a Charterhouse student, created Mallory's Variation, a new route on Abbey Buttress, Great Gable, where Mallory finished the route by ascending a twenty-foot slab on tenuous grips, rather than exiting to the right. On 8 September 1913, with Mallory leading Goodfellow, the pair established another new route, this time on the West Face of Low Man, Pillar Rock, at 65 m, and graded Hard Very Severe, which they named North-West by West and now known as Mallory's Route. Compared to Mallory's Route, Conrad Anker rated the Second Step on Mount Everest at 5.10, using the Yosemite Decimal System.

In Scotland
On 3 April 1906, Mallory, Robert Lock Graham Irving, the teacher who first acquainted him with climbing at Winchester College in 1904, and Guy Leach, a 20-year-old student at New College, Oxford, arrived at Fort William, Scotland, taking accommodation at St Andrew's Choir School, for a 10-day climbing excursion, which was Mallory's first experience of a climbing trip in the British Isles. On 6 April 1906, Mallory, Irving, and Leach reached the summit of Ben Nevis at 1345 m, climbing in snow via Observatory Gully and Tower Gully on the mountain's northeast face. The following day, 7 April 1906, the trio ascended Stob Bàn, following the corniced main arête to the summit at 999 m. On 9 April 1906, they climbed to the summit of Càrn Mòr Dearg at 1220 m, which preceded a second successful ascent of Ben Nevis on the same day via North Trident Buttress. On 10 April 1906, they successfully climbed a feature on Ben Nevis—that they termed East Zmutt Ridge after the Zmutt Ridge on the Matterhorn—that was most presumably Ledge Route on Number Five Gully Buttress, rated Grade II and first ascended in 1895. On 12 April 1906, Mallory, Irving, and Leach undertook the last climb of their trip, attaining a successful ascent of Ben Nevis in snow and ice via North-East Buttress, now rated Grade IV. Their achievement was the second recorded winter ascent of this route, the first by Willie Naismith, Alexander Kennedy, William Wickham King, Frances Conradi Squance, and Walter Brunskill on 3 April 1896. On 28 July 1918, Mallory, David Randall Pye, and Leslie Garnet Shadbolt (1883–1973), climbing together, made a new route on the North Face of Sgùrr a' Mhadaidh on the Isle of Skye, Scotland. On 31 July 1918, the triad established another new route with Mallory leading on the Western Buttress of the crag, Sron na Ciche, which has a maximum altitude of 859 m, located in the Cuillin mountains on the Isle of Skye, Scotland; this route is now known as Mallory's Slab and Groove, at 300 m, and graded Very Difficult. On 1 August 1918, Mallory and Ruth left the Isle of Skye, while Pye and Shadbolt remained, creating a new route on 5 August 1918 on Sron na Ciche, named Crack of Doom, at 165 m, and graded Hard Severe.

In Wales
On 13 September 1907, Mallory, Geoffrey Keynes, and Hugh Wilson, the son of James Wilson, Canon of Worcester, arrived in Wales for a twelve-day climbing trip, where they stayed at a farm called Gwern-y-Gof-Isaf, near Capel Curig, in Snowdonia National Park, which was Mallory's first climbing excursion in Wales. They climbed on Tryfan, Y Lliwedd, Glyder Fawr, Crib Goch, and Craig yr Ysfa. On 14 September 1907, Mallory accomplished his first two climbs in Wales: North Gully on Tryfan, first ascended by Roderick Williams and his brother Tom in 1888; and North Buttress, also on Tryfan, first climbed by Owen Glynne Jones, George Dixon Abraham, and Ashley Perry Abraham at Easter 1899. On 18 September 1907, Mallory, Keynes, and Wilson climbed Terminal Arête, at 121.92 m, graded Moderate, on Lliwedd's East Buttress, first ascended in 1903, and purportedly inadvertently dislodged a large rock as they were finishing their climb. Much to their consternation, the rock narrowly missed James Merriman Archer Thomson and his partner E.S. Reynolds as they climbed below on a new route, which they aptly named Avalanche Route. On Craig yr Ysfa, the triad climbed two routes: Great Gully, at 223 m, graded Very Difficult and first climbed by James Merriman Archer Thomson, R.I. Simey, and W.G. Clay on 22 April 1900; and Amphitheatre Buttress, at 293 m, graded Very Difficult, with the first ascent completed by George Dixon Abraham, Ashley Perry Abraham, Darwin Leighton, and James William Puttrell in 1905. Mallory returned to Snowdonia in August 1908, accompanied by his younger brother, Trafford. With their bikes weighed down with gear and climbing ropes looped over their shoulders, they cycled 40 mi from Birkenhead, Cheshire, to Snowdonia and camped inside a cowshed by the Afon Llugwy River in Capel Curig. During the same month on this trip, Mallory, climbing solo, established the first ascent of The Slab Climb on East Buttress of Lliwedd, now known as Mallory's Slab, at 67.056 m, and graded Very Difficult. The ascent of The Slab Climb, allegedly occurred due to Mallory scaling it to retrieve his pipe, which he had left behind, on a ledge known as Bowling Green.

In April 1909, Mallory and Geoffrey Winthrop Young journeyed to Pen-y-Pass for a climbing trip, a week before the main party of climbers, who stayed at the Gorphwysfa Hotel, where Mallory and Young joined them after camping for a week in a corrugated-iron outbuilding, which they called the shanty. On the cliffs of Craig yr Ysfa, Mallory and Young established three new ascents and climbed The Slab Climb (Mallory's Slab) on East Buttress of Lliwedd, which Young described as "The hardest rocks I have done." When the remainder of the climbing party arrived at Pen-y-Pass, Mallory, Young, Marcus Beresford Heywood, and two Irish climbers, Edward Evans, and Page Dickinson, made the third ascent of Route 1 (Central Route), on Lliwedd, at 121.92 m, graded Very Difficult, pioneered by James Merriman Archer Thomson, and Oscar Eckenstein, on 24 April 1903. In April 1909, during the same trip, Mallory and Evans climbed an unintended new route on East Buttress of Lliwedd. They intended to ascend Great Chimney, at 225.55 m, graded Very Difficult, first climbed by James Merriman Archer Thomson, Oscar Eckenstein, and Humphrey Owen Jones in April 1907. Due to the misty conditions, route-finding became difficult; as a result, they missed the starting point of Great Chimney and ascended a different line, which, as a consequence, they named Wrong Chimney, at 231.64 m, now graded Severe. In July 1910, Mallory travelled to Pen-y-Pass in the company of Hugh Wilson, and they completed Lliwedd's Girdle Traverse, at 1000 m, graded Very Difficult and first traversed by James Merriman Archer Thomson and E.S. Reynolds in September 1907. In early September 1911, Mallory and his sister Mary travelled to Wales, joined by Harold Edward Lionel Porter, Mallory's climbing partner, for a week-long excursion, and stayed at the Snowdon Ranger Inn, situated on the shore of Llyn Cwellyn. During this trip, Mallory and Porter pioneered several new routes that elevated Mallory to the pinnacle of modern British climbing. On Y Garn, with Porter leading Mallory on the climb's crux, they ascended a new route, now known as Mallory's Ridge, at 120 m, now graded Hard Very Severe. This route defeated James Merriman Archer Thomson in 1910, who abandoned his attempt on the most challenging pitch, a sixty-foot segment of vertical rock. In October 1910, also on this route, Swiss climber J. Anton Stoop tragically perished in a fall after some large boulders collapsed beneath him. Mallory and Porter created a further two new routes: on Llechog, Eastern Gutter at 85.34 m, now graded Very Severe; on Lliwedd, Far East Cracks (Direct Finish), at 121.92 m, also graded Very Severe.

In September 1912, Mallory returned to Snowdonia National Park for a climbing trip and again took lodgings at the Snowdon Ranger Inn. His primary climbing partner was Ralph Todhunter (1867–1926), who, on 12 July 1926, died in a fall while climbing with his nephew Ernest Bozman on the southwest wall of Cima della Rosetta, which has a maximum altitude of 2743 m, in the Dolomites, near San Martino di Castrozza, Italy. During three days of climbing, Mallory, in unison with Todhunter, endeavoured to discover new climbs away from well-established climbing locations, to be featured in Geoffrey Winthrop Young and James Merriman Archer Thomson's prospective climbing guidebook. On Craig Cwm Du, the pair pioneered three first ascents: Pis-Aller Rib, at 141 m, now graded Severe; Yellow Buttress, at 155 m, also graded Severe; and Adam Rib, at 121.92 m, graded Hard Severe—straightening out a route established in 1911 by James Merriman Archer Thomson and his party by overcoming difficulties he had circumvented on the finishing pitch. On Clogwyn Du'r Arddu, also called "Cloggy," which had only two routes, established in 1905, Mallory and Todhunter created the third, East Gully, at 152.4 m. On Craig Yr Ogof (Cwm Silyn), they recorded its first rock climbing route, Four Pitch Gully, at 91.44 m, later graded Difficult. On 27 December 1913, Mallory, Geoffrey Winthrop Young, and Siegfried Wedgwood Herford established a milestone by completing the first recorded double traverse on the snow-and-ice-covered north face of Lliwedd. They commenced on Far East Buttress, completing Girdle Traverse at Slanting Buttress, and re-traversed the entire face by following a higher line than previous. In December 1915, Mallory, Conor O'Brien, and Herbert Vincent Reade travelled to Wales for a climbing trip and stayed at Pen-y-Pass. On Clogwyn y Ddysgl, they merged two already-existing lines to create a new route that they named, The Black Gates, at 66 m, now graded Very Difficult. On 31 December 1915, Mallory, O'Brien, and Reade created Three Pinnacle Face (to Bilberry Terrace only) on Lliwedd's West Peak by adding a new start to an old line. In January 1919, Geoffrey Winthrop Young initiated the re-establishment of the Easter Pen-y-Pass parties and determined that out of a total of sixty climbers, whose identities were listed in the Pen-y-Pass book until 1914, twenty-three of them had perished in World War I, and eleven more had suffered injuries, including himself. On 31 August 1917, while serving on the Isonzo Front during the Eleventh Battle of the Isonzo as an ambulance driver in the First British Ambulance Unit for Italy, based at Villa Trento, Dolegnano, near Udine, Italy, and commanded by George Macaulay Trevelyan, an Austrian shell struck Young, at Monte San Gabriele. His left leg was extensively injured, necessitating amputation at the knee. At Easter 1919, Mallory and his wife Ruth were among the twenty-eight guests who stayed at the Gorphwysfa Hotel for the Pen-y-Pass climbing trip. On Easter Monday, 21 April 1919, Mallory, Ruth, David Randall Pye, and Claude Aurelius Elliott established two new routes on Lliwedd's East Buttress: Bowling Green Buttress, at 85.34 m, graded Very Severe and Garter Traverse, at 243.84 m, also graded Very Severe.

First expedition in the Alps
On 2 August 1904, Mallory and his fellow Wykehamist, Harry Olivier Sumner Gibson, the first cousin of Laurence Olivier, left Southampton, England, with and under the guidance of Robert Lock Graham Irving, and arrived in Bourg-Saint-Pierre, Switzerland, on 4 August 1904, which was Mallory's first climbing trip to the Alps. On 5 August 1904, Irving, Mallory, and Gibson attempted their first climb, Mont Vélan, located on the Swiss-Italian border, but after a valiant endeavour, had to retreat approximately 182.88 m below the summit because both Mallory and Gibson suffered from altitude sickness. On 8 August 1904, after climbing via the west arête, they crossed the vast snowfield from Combin de Valsorey and successfully reached the summit of Combin de Grafeneire. On 13 August 1904, at 11:20a.m. (Swiss time), Irving, Mallory, and Gibson reached the summit of Dufourspitze at 4,634 m, the third-highest peak in Western Europe. On 26 August 1904, at 7:00 a.m., with Gibson departed, Irving and Mallory commenced an assault on Mont Blanc, at 4807.81 m, the highest mountain in Western Europe. They ascended via the west branch of the Glacier du Dôme and thence an ice slope beneath the ridge, which connects the Tour des Aiguilles Grise with Bionnassay arête. After climbing to the top of the ice slope, they turned right and followed the ridge to Piton des Italiens, at 4003 m, from where they ascended to Dôme du Goûter and reached the Vallot Hut shortly after midday. After a meal at the Vallot, they proceeded up the Bosses du Dromadaire towards the summit of Mont Blanc, which they attained in an hour and fifteen minutes from the refuge.

Second, third, and fourth expeditions in the Alps
In January 1905, Robert Lock Graham Irving established the Winchester Ice Club. With Irving as the club's president, Mallory, Harry Olivier Sumner Gibson, Harry Edmund Guise Tyndale (1888–1948), and Guy Henry Bullock became members. In August 1905, the Ice Club travelled to the Alps. On 21 August 1905, at 3:15a.m. (Swiss time), Irving, Mallory, and Bullock left the Bertol Hut, crossed the vast snowfield at the head of the Mont Miné and Ferpècle Glaciers, arrived at the South Ridge of Dent Blanche at 7:15a.m., climbed the arête, and reached the summit, at 4357 m, before midday. After the 1909 Pen-y-Pass party, Geoffrey Winthrop Young invited Mallory to join him for a climbing trip in the Alps. On 29 July 1909, after a four-year hiatus, Mallory departed for the Alps in the company of Young, where they arrived on 31 July 1909 and, on 2 August 1909, were joined by Charles Donald Robertson (1879–1910). On 1 August 1909, at 5:30a.m., Mallory and Young set out from Belalp, climbed Unterbächhorn via the Enkel Ridge, and reached the summit at 12:35p.m. On 4 August 1909, at 3:00a.m., Mallory, Young, and Robertson left Belalp, crossed the Unterbäch Glacier, and at 9:00a.m. reached the summit of Unterbächhorn. Their objective was to ascend the formidable, unclimbed Southeast Ridge of Nesthorn. They followed the narrow exposed ridge from the summit of Unterbächhorn, reaching the col that marked the beginning of the unconquered arête, which they successfully climbed, and at 7:00p.m., they attained the summit of Nesthorn, at 3822 m, for a historical first ascent. On 6 August 1909, Mallory, Young, and Robertson ascended to the Konkordia Hut from Belalp, and on 7 August 1909, they crossed the mountain pass Grünhornlücke, followed by the upper part of the Fiescher Glacier, and climbed to the summit via the Southeast Ridge of the highest mountain in the Bernese Alps, Finsteraarhorn, at 4,274 m. On 9 August 1909, the triad reached the summit of Jungfrau at 4,158 m. On 13 August 1909, Mallory, Young, and Robertson, accompanied by the Swiss mountain guide Josef Knubel, traversed Aiguille Verte and descended via the Moine Ridge. Their culminating route was a traverse of Aiguille du Chardonnet on 20 August 1909, ascending via the Forbes Ridge and descending by the Col du Passon. In August 1910, Mallory travelled to the Alps with fifteen-year-old John Bankes-Price under his guidance and introduced him to alpine climbing. Mallory and Bankes-Price ascended the peaks of Trifthorn and Riffelhorn, and additionally, Mallory completed a traverse of Mont Collon.

Fifth expedition in the Alps
At the beginning of August 1911, Mallory returned to the Alps with Robert Lock Graham Irving and Harry Edmund Guise Tyndale. Within the Graian Alps, they ascended Gran Paradiso, at 4061 m, via its precipitous East Face, and on 8 August 1911, Ciarforon, at 3642 m, by the Northwest Ridge. On 9 August 1911, at approximately 3:30p.m. (Italian time), they reached the summit of Herbétet, at 3778 m, by way of a first ascent of its Western Ridge. On 11 August 1911, after departing Cogne at midnight, Irving, Mallory, and Tyndale completed the first traverse of the main ridge between the Colle Superiore delle Sengie, at 3338 m and Punta d'Ondezana, at 3492 m. This route took them over several cols and peaks, including Cima Occidentale di Valeille, at 3357 m, and Punta Scatiglion Orientale, at 3407 m, reaching the summit of Punta d'Ondezana just before 2:00p.m. On 14 August 1911, at 3:30a.m., the trio left the Pousset Hut, crossed the Trajo Glacier, and ascended Grivola, at 3969 m, via its North Ridge, summiting at approximately 12:30p.m. On 18 August 1911, at 3:30a.m., Irving, Mallory, and Tyndale left the Col du Géant; at 3:30p.m., they reached the summit of Mont Maudit, at 4465 m, via the third ascent of its Southeast Ridge (Frontier Ridge), and thence attained the summit of Mont Blanc at 6:30 p.m. In 1917, Mallory rewrote an impassioned account, begun in 1916 while serving in France, about the Mont Maudit ascent with Irving and Tyndale. It was published as an article in the Alpine Journal of 1918, titled Mont Blanc from the Col du Géant by the Eastern Buttress of Mont Maudit, and contained the question, "Have we vanquished an enemy? None but ourselves." Irving, Mallory, and Tyndale's final climb of the August 1911 trip commenced in Saint-Gervais-les-Bains, ascending to the Col de Miage, from where they followed the ridge to the head of the Glacier de Tré-la-Tête, then climbed to the summit of Tête Carrée, at 3732 m, via its North-northwest Ridge, and descended to Les Mottets from the Col du Mont Tondu.

Sixth expedition in the Alps
In August 1912, Mallory undertook his sixth expedition to the Alps, along with mountaineering partners Harold Edward Lionel Porter and Hugh Rose Pope (1889–1912). On 8 August 1912, Mallory, Porter, and Pope ascended to the summit of Pointe des Genevois, at 3674 m, from where they traversed 400 m along the arduous and exposed narrow ridge to the summit of Dent de Perroc, at 3676 m. The triad set out at 3:30a.m. on 10 August 1912, and climbed by its precipitous North Face to the summit of Pigne d'Arolla, at 3796 m, then descended to the Col de la Serpentine, from where they ascended to the summit of Mont Blanc de Cheilon, at 3870 m. The following day, 11 August 1912, Mallory awoke with extremely painful swollen eyes and was diagnosed with snow blindness by a doctor, who advised him to stay in a darkened room for several days. On 15 August 1912, Mallory, Porter, and Pope, along with Canon George Harford and Mabel Capper, traversed the Douves Blanches Southwest arête. On 17 August 1912, Mallory, Porter, and Pope established a new route; they ascended a line on the West Face of Dent Blanche, joined the South Ridge a short distance below the summit, which they reached at 10:30a.m., then descended via the South Ridge (Wandfluh Ridge) and arrived in Zermatt, Switzerland, at 7:30p.m. Mallory's final outing of the 1912 Alpine expedition, his last for seven years, was with Geoffrey Winthrop Young and Hugh Rose Pope in an ascent to the summit of Tête du Lion, at 3713 m, before returning to Zermatt via the Col Tournanche, at 3471 m.

Seventh and eighth expeditions in the Alps
At the end of July 1919, Mallory returned to the Alps, accompanied by climbing partners Harold Edward Lionel Porter and Claude Aurelius Elliott. On 1 August 1919, Elliott, as a consequence of a knee injury, could not further participate in mountaineering activity and travelled back to England. On 2 August 1919, Mallory and Porter set out from Montanvert and proceeded up the Mer de Glace to the Glacier de Trélaporte, from where they ascended a new route to the summit of Aiguille des Grands Charmoz, at 3445 m, via its forbidding East Face and North East arête. On 5 August 1919, at 2:30a.m., Mallory and Porter left the Refuge du Plan de l'Aiguille, crossed the northern section of the Glacier des Pélerins, and climbed a new route on its Northwest Face to the summit of Aiguille du Midi, at 3842 m, which they reached at 12:15p.m. (French time). This route, rectified by the climber Jean-Louis Urquizar on 25 July 1971, is now known as Rectified Mallory-Porter, totalling 1530 m in elevation gain and graded AD+. On 8 August 1919, Mallory and Porter, with British climbers Arthur Cecil Pigou and William Mclean, left Purtud, walked up the Val Veny, went up the Miage Glacier and Glacier du Mont Blanc, and reached the Quintino Sella Hut at 8:00p.m. The following day, 9 August 1919, at 5:15a.m., Mallory, Porter, Pigou, and Mclean left the Quintino Sella Hut and completed a traverse of Mont Blanc by following a route known as Tournette Spur—pioneered by Jean-Antoine Carrel, Thomas Stuart Kennedy, and Johann Fischer on 2 July 1872—and reached Grand Mulets by descent at 4:15p.m. On 24 July 1920, Mallory departed England for his eighth and final expedition to the Alps with Herbert Vincent Reade, Claude Aurelius Elliott, and David Randall Pye. The adverse weather and physical conditions of some of Mallory's climbing partners hampered their objectives. By the time Elliott left the expedition due to a recurring knee injury and Pye because of physical fitness issues, the mountaineering party had ascended Aiguille de Talèfre at 3730 m and traversed Aiguille de Triolet at 3870 m from the Glacier de Pré de Bar to the Glacier de Triolet. Mallory and Reade journeyed to Zermatt, where they rendezvoused with two new climbing partners, George Ingle Finch and Thomas Guy Burton Forster (1886–1962). Mallory, Reade, Finch, and Forster ascended to the Matterhorn summit at 4478 m, and two days later, they attained the summit of Zinalrothorn at 4221 m.

One of Mallory's closest friends and climbing companions, whom he met in Zermatt, Switzerland, on 31 August 1909, was a young woman named Cottie Sanders, who became a novelist using the pseudonym of Ann Bridge. Their relationship was elusive; Sanders was either a "climbing friend" or a "casual sweetheart." After Mallory died, Cottie wrote a memoir of him, which was never published but provided much of the material used by later biographers, such as David Randall Pye and David Allan Robertson, and the novel Everest Dream.

1921 British Mount Everest reconnaissance expedition
Mallory participated in the first historical expedition to Mount Everest in 1921, which was coordinated and subsidised by the Mount Everest Committee and had the express objective of undertaking a detailed reconnaissance of the mountain and its approaches to discover the most accessible route to its summit. From the Survey of India, expedition surveyors Henry Morshead and Oliver Wheeler, with the assistance of Indian surveyors Lalbir Singh Thapa, Gujjar Singh, and Turubaz Khan, produced the first accurate maps of the Mount Everest region. On a $1/4$ -inch scale, the expedition surveyed 12000 sqmi of new territory, and they also revised an existing $1/4$ -inch scale, 4000 sqmi map of Sikkim. Using photo-topographical surveying instruments, Major Wheeler single-handedly completed a methodical and detailed photographic survey of the environs of Mount Everest, covering an area of 600 sqmi on a 1-inch scale. From the Geological Survey of India, expedition geologist Alexander Heron conducted a geological reconnaissance by mapping an area of 8000 sqmi on a $1/4$ -inch scale. The area's natural history was explored in considerable detail by expedition naturalist and medical officer Sandy Wollaston, with mammals, birds, and plants collected, including new specimens. On 18 August 1921, at 3:00a.m., after an arduous two-month-long reconnaissance of Everest's northern and eastern approaches, Mallory, Guy Bullock, Henry Morshead, and a porter named Nyima left their high camp at approximately 6096 m. From the western head of the Kharta Glacier, they ascended to the col of Lhakpa La, at 6849 m, which they reached at 1:15p.m. From the col of Lhakpa La, 366 m directly below them, was the head of the East Rongbuk Glacier, across which rises a 305 m wall of snow and ice leading to Everest's North Col, at 7020 m, from where mountaineers can attain the summit via the North Col-North Ridge-Northeast Ridge route. Their preliminary reconnaissance was complete; they discovered the gateway to the mountain. On 23 September 1921, at 11:30a.m., Mallory, Bullock, Wheeler, and ten porters left their camp on Lhakpa La, descended into the East Rongbuk Glacier, and pitched camp at approximately 4:00p.m., at an elevation of 6706 m, 1 mi from the beginning of the ascent to the North Col. On 24 September 1921, at 7:00a.m., the three expedition members and three porters, Ang Pasang, Lagay, and Gorang, departed from their camp, traversed 1 mi across the East Rongbuk Glacier to the foot of the 305 m precipitous wall of snow and ice, which they arduously ascended, and reached the North Col at 11:30a.m. On the col and above, gale force winds blew from the northwest, which made further advance impossible, and they descended to their camp on the East Rongbuk Glacier, where they spent the night. Wheeler suffered from the first stages of frostbite in each of his lower extremities below the knee, and Bullock was exhausted. The next day, 25 September 1921, the severe winds had not abated; the porters were at the limits of their physical reserves, and Mallory made a definitive decision by ending the reconnaissance and expedition.

First summit attempt, Mallory, Somervell, Norton, and Morshead
In 1922, Mallory returned to the Himalayas as a member of the 1922 British Mount Everest expedition led by Brigadier-General Charles Bruce. The expedition's primary objective was to attain the summit of Mount Everest and become the first mountaineers to accomplish this. On 20 May 1922, at 7:30a.m., Mallory, Howard Somervell, Edward Norton, Henry Morshead, and four porters began their day at Camp IV, situated on the North Col at an elevation of 7,010 m. At 8:00a.m., after getting roped up, the eight men commenced their ascent from the North Col without supplemental oxygen. They aimed to climb the North Ridge and establish Camp V at an altitude of 7925 m, from where they planned an attempt to reach the summit. At 11:30a.m., they attained an elevation of 7620 m, a gain of 610 m from the North Col, in $3 1/2$ hours, a vertical climbing rate of 174 m per hour, including stops. Mallory estimated that from their present position, it would necessitate an approximate three hours to ascend 305 m and pitch Camp V there, which left little time for the porters to return to Camp IV on the North Col before nightfall and was uncertain of finding a well-sheltered area from the strong winds on the lee-side of the North Ridge above them. Therefore, they abandoned their initial plan and erected Camp V at their current altitude of 7620 m. The four porters departed for the North Col camp at 3:00p.m., and Mallory, Somervell, Norton, and Morshead spent the night at Camp V.

The next day, 21 May 1922, at 8:00a.m., the four mountaineers were roped up and commenced their attempt to reach the summit from Camp V. After a few steps, Morshead, who was suffering from frostbite in his fingers and toes, declared that he was unable to continue and stayed behind at Camp V. Adverse weather conditions prevented the climbers from beginning their ascent at 6:00a.m. as planned, leaving them decidedly behind schedule. Other than possible mountaineering difficulties, the fate of their summit bid depended predominantly on time and speed. Mallory's arithmetical computation estimated their vertical ascent rate at an unsatisfactory 122 m per hour, not including stops, from which it was apparent they would be climbing after nightfall, a risk they were unwilling to take, and decided that 2:30p.m. was their retreat time. At 2:15p.m., Mallory, Somervell, and Norton halted and lay against rocks on the North Ridge, where they remained for fifteen minutes and nourished their weary bodies with sustenance. Their aneroid barometer read 8169 m, a height later rectified and confirmed by a theodolite as 8225 m, a new world altitude record. At 2:30p.m., they began their descent, and at 4:00p.m., they reached Camp V, where Morshead was waiting to join them for the return to Camp IV on the North Col. The four climbers roped up and recommenced their descent to 7,010 m. As they descended, Morshead, who was third on the rope, slipped, and his impetus dragged Somervell and Norton down a slope leading directly to the East Rongbuk Glacier, several thousand feet below. Mallory, who was leading at the time of this near-catastrophic incident, immediately reacted by forcing the pick of his ice axe into the snow and hitching the climbing rope around the axe's adze. He stood in a secure position and held the rope in his right hand above the hitch, pressed downward with his left hand on the axe's shaft, and, using his entire weight, leaned towards the incline, securing the pick of his axe in the snow. Commonly, in such circumstances, the belay will not hold when applying this technique, or the climbing rope will snap. Fortunately, the axe and rope held because their bodies' combined weight and momentum did not come upon the rope at once, which saved the lives of Somervell, Norton, and Morshead. They regained their positions and reached their tents after nightfall at 11:30p.m. on the North Col., exhausted, hungry, frostbitten, and dehydrated.

Second summit attempt, Finch and Bruce
On 27 May 1922, at 6:30a.m., George Finch, Geoffrey Bruce, and Tejbir Bura departed from Camp VI at 7772 m on the North Ridge, using supplemental oxygen for the expedition's second attempt to reach the summit of Everest. Their plan of assault was to take Bura, who was shouldering two spare oxygen cylinders, as far as the Northeast Shoulder at 8352 m, where he would begin his descent, leaving Finch and Bruce to continue their ascent. When they reached 7925 m, Bura, at the limits of his endurance, collapsed, unable to continue. He commenced his descent to Camp VI, where, being a solitary figure, he would await the return of his two climbing partners. Finch and Bruce continued their endeavour to reach the summit, loaded up the extra oxygen cylinders that Bura had been shouldering, and dispensed their climbing rope to enable themselves to advance faster. By the time they attained an elevation of 8077 m on the North Ridge, the wind, which had been gradually increasing, had intensified to such a strength that it necessitated a change in their line of ascent, which they hoped would reduce the possibility of the onset of exposure by providing more shelter. Therefore, Finch and Bruce left the North Ridge and continued their climb towards the summit by traversing across the Yellow Band on the North Face of Everest. When they reached 8230 m, they changed course and climbed diagonally towards a point on the Northeast Ridge, approximately halfway between the Northeast Shoulder and the summit. Not long after, Bruce, about 6 m below Finch when his oxygen apparatus failed, struggled valiantly upwards as his climbing partner came to his aid, and they soon repaired the equipment. The time was approximately midday, and their aneroid barometer registered an elevation of 8321 m, surpassing the previous attempt by 96 m, a new world altitude record. Weakened by hunger and debilitated by exhaustion, they were not in any physical condition to continue their summit bid. They began their descent, regained the North Ridge just after 2:00p.m. and reached Camp VI at 2:30p.m.

Third summit attempt, Mallory, Somervell, Crawford, and the North Col avalanche
At the beginning of June 1922, during the onset of the impending monsoon season, the expedition arranged a third attempt to reach the summit. Despite their awareness of the apparent dangers of the prevailing monsoon conditions, they were intent on implementing their plan. Their objective was to ascend to their old Camp V at 7620 m without using supplemental oxygen and, from there, use a cylinder of oxygen each to attain an elevation of 7925 m, where they would establish their new Camp V, from where they would use supplemental oxygen for their endeavour to reach the summit. On 7 June 1922, at 8:00a.m., Mallory, Somervell, Colin Crawford, and fourteen porters left Camp III at 6401 m, traversed across the head of the East Rongbuk Glacier in snow, in which they sank to their knees and at 10:00a.m., reached the base of the 305 m, wall of snow and ice rising to the North Col. At 10:15a.m., four men roped up in the following order: Somervell leading, then Mallory, a porter, and Crawford, initiated the climb to the North Col. At approximately 1:30p.m., Mallory, Crawford, and the porter halted some 183 m below Camp IV, which allowed time for the thirteen porters ascending below on three separate ropes to join them. Unroped at this time, Somervell, who was a short distance ahead, was cutting steps in the snow to gain time. At about 1:50p.m., soon after the seventeen men had recommenced their ascent, an avalanche emanated from an ice cliff above them, sweeping over the entire group. Mallory, Somervell, Crawford, and the porter extricated themselves from beneath the snow. They peered down the slope and observed a group of four porters roped together, approximately 46 m below them, who had been climbing in the second party directly behind and laboriously just struggled to their feet. The porters were pointing urgently down the slope towards a crevasse, into which the avalanche had swept two groups totalling nine porters, of which four were on one rope and five on another. Immediately implemented was a rescue mission comprising Mallory, Somervell, Crawford, four porters, and expedition members John Noel and Arthur Wakefield later joined them. They recovered eight of the aggregate of nine porters swept into the crevasse, of whom only two were alive, and they could not find the one remaining porter, who tragically was killed along with the six others. The names of the seven porters who perished were Lhakpa, Narbu, Pasang, Pema, Sange, Temba, and Antarge. At Camp III, a memorial cairn was constructed in their honour, made of boulders from a glacier moraine. This catastrophic event marked the end of the third summit attempt and the 1922 British Mount Everest expedition.

The personnel of the expedition
Mallory participated in the 1924 British Mount Everest expedition, led again, as in 1922, by Brigadier-General Charles Bruce. The other members of the 1924 expedition team were: Edward Norton as second-in-command and mountaineering leader; mountaineers Andrew Irvine, Howard Somervell, Geoffrey Bruce, Bentley Beetham, and John de Vars Hazard; mountaineer and oxygen officer Noel Odell; photographer and cinematographer John Noel; naturalist and medical officer Richard Hingston; and transportation officer Edward Shebbeare. On 9 April 1924, General Bruce collapsed due to recurrent malaria and had ongoing cardiovascular issues during the trek to Everest Base Camp. As a result, Norton took charge of the expedition leadership, appointed Mallory as deputy and mountaineering leader, and General Bruce returned to India.

First summit attempt, Mallory and Bruce
On 1 June 1924, at 6:00a.m., Mallory and Bruce, without supplemental oxygen on the expedition's first summit attempt, and eight porters commenced their ascend from Camp IV on the North Col at 7010 m. They planned to climb the North Ridge and establish Camp V at approximately 7772 m, where they would sleep overnight; the following day, 2 June 1924, they would ascend to about 8291 m, where they would pitch Camp VI, sleep there overnight, and from there, on 3 June 1924, attempt to reach the summit, without oxygen. The precise elevation for establishing Camps V and VI depended on the porters' physical abilities to carry heavy loads in the rarefied air and weather conditions. As the two climbers and eight porters ascended the North Ridge with an average gradient of 45 degrees, they exposed themselves to a penetrating northwest wind. At approximately 7620 m, four of the porters could not ascend any further after reaching the limits of their endurance. Mallory, Bruce, and the four remaining porters progressed to an elevation of 7681 m, where they established Camp V. Five of the eight porters descended to Camp IV, leaving three to shoulder loads the following day up to the location where the expedition intended to pitch Camp VI. Mallory, Bruce, and the three porters slept at Camp V that night, and on the next day, 2 June 1924, only one porter was able to proceed, and two declared themselves sick and physically unable to carry loads. Without enough porters to assist both climbers, the summit attempt, destined to fail, was abandoned immediately, and the party returned to the North Col, which they reached by midday.

Second summit attempt, Somervell and Norton
On 2 June 1924, at 6:30a.m., Somervell and Norton began their summit attempt from Camp IV, without supplemental oxygen, along with the assistance of six porters carrying loads. During their ascent on the North Ridge, they encountered Mallory, Bruce, and their porters descending from Camp V after their summit bid, which proved unavailing. Because Camp V, part of which the previous party had intended to use for their higher Camp VI, had been left where it was, in its entirety, with tents and sleeping bags, Somervell and Norton sent a pair of their porters down, who descended with Mallory, Bruce, and their porters, as they no longer required their services or the loads that they were shouldering. At approximately 1:00p.m., Somervell, Norton, and their four porters reached Camp V at 7681 m, which the preceding party on the sheltered eastern side of the North Ridge had pitched. The two mountaineers and their four porters spent the night at Camp V. On the following morning of 3 June 1924, one of their porters, Lobsang Tashi, suffering from altitude sickness, could not continue and descended alone to Camp IV on the North Col. At 9:00a.m., Somervell, Norton, and their three remaining porters, Narbu Yishé, Llakpa Chédé, and Semchumbi, departed from Camp V and continued their ascent up the North Ridge. At approximately 1:30p.m., the valiant Semchumbi, who was lame with a swollen knee, had reached his limits and could not continue. As a result, Norton brought the entire party to a halt at about this time, and he selected a site to pitch Camp VI at their current altitude. At an elevation of 8138 m, they established Camp VI in a narrow cleft, which provided some possible shelter from the northwest wind. At about 2:30p.m., the services of the three porters, Narbu Yishé, Llakpa Chédé and Semchumbi, were no longer required, and Norton sent them down to Camp IV on the North Col. Somervell and Norton camped that night at 8138 m, the highest elevation at which anyone had ever slept up to that time.

On 4 June 1924, at 6:40a.m., Somervell and Norton left Camp VI and commenced their assault to reach the summit of Mount Everest, a vertical height of 710.7 m above. The weather conditions were fine—clear, almost windless, but bitterly cold—a perfect day for a summit attempt. After approximately an hour of ascent up the North Ridge, they reached the lower edge of the Yellow Band, a stratum of sandstone about 305 m deep that crosses the entire North Face. From this location, they changed their line of ascent by leaving the North Ridge and traversing diagonally across the Yellow Band, following a line roughly parallel to and approximately 152 m to 183 m lower than the crest of the Northeast Ridge. Towards midday, Somervell and Norton reached a point below and in proximity to the top periphery of the Yellow Band and were a short distance east of the Norton Couloir. At midday, as they neared 8534 m, Somervell, who was suffering from an extremely sore throat and a severe cough as a result, felt that, from his perspective, it was impracticable for him to continue. To Norton, he expressed that he was only delaying him and encouraged him to continue alone and reach the summit. Somervell sat on a ledge while Norton proceeded solo. At 1:00p.m., suffering from temporary visual impairment due to oxygen deficiency, exhausted from his efforts, and knowing that from his present location and the current time, he stood no chance of reaching the summit and returning safely, Norton retreated from a point where he had attained a new world altitude record of 8572.8 m. During their descent on the North Ridge, at around 7620 m, Somervell experienced intense coughing and dislodged something in his throat, severely obstructing his breathing. He was close to death and saved his own life by forcibly pressing on his chest with both hands, dislodging the obstruction that came into his mouth, and coughing up blood. The obstruction was a slough from the mucous membrane lining of his larynx caused by frostbite. At 9:30p.m., Somervell and Norton reached Camp IV on the North Col.

Third summit attempt, Mallory and Irvine
On 4 June 1924, at 2:10p.m., Mallory and Andrew Irvine, using supplemental oxygen for the final half of their ascent, left Camp III at 6401 m and reached Camp IV on the North Col at 7010 m in 3 hours, at 5:10p.m., including approximately $1/2$ an hour at a dump choosing and testing oxygen cylinders. That night at Camp IV, Mallory shared a tent with Norton, who had just returned from his summit attempt with Somervell, and informed Norton that if his summit bid with Somervell had failed, he had planned to make one further attempt with supplemental oxygen. Mallory further elucidated that he went down to Camp III and recruited enough porters with Bruce's assistance for another endeavour. He also chose Irvine as his climbing partner because of the initiative and mechanical expertise he exhibited with the oxygen apparatus. On 6 June 1924, at 8:40a.m., Mallory and Irvine, who would use supplemental oxygen for part of their ascent, set off in excellent weather from Camp IV on the North Col for Camp V on the North Ridge at 7681 m, accompanied by eight porters. Both mountaineers shouldered modified oxygen apparatus, each man carrying two cylinders apiece, and their eight porters, not using oxygen, took provisions, bedding, and extra oxygen cylinders. Mallory and Irvine progressed steadily and attained Camp V in good time, and shortly after 5:00p.m. that evening, four of their porters arrived back at Camp IV, with a note from the climbing party stating, "There is no wind here, and things look hopeful." The two climbers and their four remaining porters spent the night at Camp V. On 7 June 1924, Mallory, Irvine, both using oxygen for part of their climb, and their four porters ascended to Camp VI at 8138 m on the North Ridge. That same day, expedition member Noel Odell, in support of Mallory and Irvine and his porter Nema climbed to Camp V from the North Col. Soon after they had attained Camp V, Mallory and Irvine's four remaining porters reached Camp V from Camp VI, and they gave Odell a handwritten note from Mallory, which read:

Odell's porter, Nema, was suffering from altitude sickness, so consequently, that evening of 7 June 1924, he sent him down, along with the other four porters, to Camp IV. When the five porters reached Camp IV on the North Col, one of them, known as Lakpa, gave expedition member John Noel a second handwritten note from Mallory, which read:

John Noel's filming location was above Camp III, on the ledge of a buttress at 6706 m on the Eastern Ridge of Changtse, which he called "Eagle's Nest Point." From this vantage point, Noel had a clear view across the head of the East Rongbuk Glacier, the ice slope leading to the North Col, the Northeast Ridge, and the North Face of Mount Everest. Lakpa the porter who had given Noel the note informed him that Mallory and Irvine were in good health, had reached Camp VI, and that the weather was fine. The message from Mallory reminded Noel of the locations and the approximate time of where and when to look for him and Irvine during their summit attempt, which they had previously discussed and organised. Mallory erroneously wrote 8:00p.m. on Noel's note; he meant 8:00a.m.

The following morning, 8 June 1924, at 8:00a.m., after spending the night alone at Camp V, Odell, again supporting Mallory and Irvine, commenced his ascent up to Camp VI and, on his way, intended to conduct a geological study. That same morning, Noel perched himself at "Eagle's Nest Point," where he directed the long lens of his motion picture camera towards the summit pyramid of Mount Everest to film Mallory and Irvine. He had two assistant porters, peering through a telescope in turns, who saw nothing; 8:00a.m. arrived and went by without sighting the two mountaineers, and by 10:00a.m., cloud and mist had enshrouded their view of the entire summit ridge. As Odell ascended to Camp VI, in a limestone band at approximately 7772 m, he discovered the first definite fossils on Mount Everest. When he reached an elevation of about 7925 m, Odell climbed a small crag close to 30.48 m in height, and above him, as he reached its top at 12:50p.m., he witnessed a rapid clearing of the atmosphere and consequently saw the entire summit ridge and final peak of Mount Everest revealed, and he sighted Mallory and Irvine on a prominent rock step on the ridge:

The location of Odell's initial reported final sighting of Mallory and Irvine—before they disappeared into the clouds and was to become the last time the pair were seen alive—was at the top of the Second Step and determined by expedition member John de Vars Hazard using a theodolite to be at an elevation of 8603.5 m. At approximately 2:00p.m., as Odell reached Camp VI at, 8138 m, snow began to fall, and the wind strengthened. Inside Mallory and Irvine's tent, he discovered spare clothes, food scraps, sleeping bags, oxygen cylinders, and parts of the oxygen apparatus; outside, he found additional parts of the oxygen apparatus and the duralumin carriers. They left no note specifying when they had commenced their summit attempt or what might have transpired to create a delay. Odell departed from Camp VI, ascended about 61 m in the direction of the summit in sleet and poor visibility of no more than a few yards, and whistled and yodelled in an attempt to direct Mallory and Irvine towards Camp VI in case they happened to be within hearing distance, but it was to no avail. Within one hour, he retreated, and at approximately 4:00p.m., as he re-attained Camp VI, the weather cleared; the entire North Face became bathed in glorious rays of sunshine, and the upper crags became visually observable, but there was no sign of either Mallory or Irvine. Odell left Mallory's compass, which he had retrieved from Camp V, inside the tent at Camp VI and, at about 4:30p.m., began his descent to Camp IV on the North Col, which he reached at 6:45p.m.

On the morning of 9 June 1924, Odell and Hazard thoroughly inspected Camps V and VI using binoculars, with no sign of either mountaineer. At 12:15p.m., Odell and two porters, Nima Tundrup and Mingma, left Camp IV and, at 3:30p.m., reached Camp V, where they spent the night. The following morning, 10 June 1924, he sent his two porters back to Camp IV, as they were indisposed and unable to ascend with him to Camp VI. In a strong, bitter westerly wind, Odell climbed alone to Camp VI, using supplemental oxygen for part of the way, to about 7925 m, before disuse. At Camp VI, which he reached soon after 11:00a.m., it became immediately apparent that Mallory and Irvine had not returned to camp, as everything was as he had left it two days previously. Odell discarded his oxygen apparatus and forthwith set off along the presumed route, which both climbers might have taken, to search within the limited time available to him. After trudging on for almost two hours with no sign of either Mallory or Irvine, he ascertained that the likelihood of finding them was remote in the broad expanse of crags and slabs, and a more extensive search towards the final pyramid necessitated a larger party. Odell returned to Camp VI at 8138 m, and after taking shelter for a short time from the relentlessly strong wind, he hauled two sleeping bags from the tent up to a precipitous snow-patch, where he positioned the bags in the shape of a T, communicating the signal that there was no trace of either Mallory or Irvine. At 2:10p.m., Hazard, 1128 m below at Camp IV on the North Col, saw the T-shaped signal and knew what it meant, as he and Odell had previously drawn up a code of signals before Odell had left the North Col on 9 June 1924, for Camp V. At approximately 2:15p.m., Hazard placed six blankets in the shape of a cross on the snow surface at the North Col, which relayed a signal of death, to the watchers at Camp III. Expedition member John Noel was the first to see the signal through his telescope from Camp III, at the head of the East Rongbuk Glacier. After being informed about the situation, expedition leader Edward Norton ordered a response sign for Hazard on the North Col. Richard Hingston positioned three lines of blankets arranged apart on the glacier a short distance beyond Camp III, conveying the message, "Abandon hope and come down." After retrieving Mallory's compass and an oxygen apparatus at Camp VI, Odell descended to Camp IV, which he reached shortly after 5:00p.m.

On 8 June 1924, the same day that Mallory and Irvine were last seen alive by Odell, Mallory's wife Ruth and their three children were on holiday in Bacton, Norfolk. On 13 and 14 June 1924, Howard Somervell and Bentley Beetham oversaw the carving and building of a memorial cairn at Base Camp in memory of those who perished in the 1921, 1922, and 1924 British Mount Everest expeditions, with the inscription: In Memory Of Three Everest Expeditions; 1921, Kellas; 1922, Lhakpa, Narbu, Pasang, Pema, Sange, Temba, Antarge; 1924, Mallory, Irvine, Shamsher, Manbahadur. On 15 June 1924, the expedition evacuated Base Camp for the journey home. On 19 June 1924, Arthur Robert Hinks, who was then in London, received a coded telegram that read, "Mallory Irvine Nove Remainder Alcedo," sent from expedition leader Edward Norton. "Nove" expressed the message that Mallory and Irvine had died, and "Alcedo" meant that everyone else was unharmed. That same day, Hinks sent a telegram to Cambridge, where shortly after 7:30p.m. that evening, a delivery boy arrived with it at the Mallory residence, Herschel House, Herschel Road, Cambridge, to communicate the tragic news and the condolences of the Mount Everest Committee to Mallory's wife, Ruth.

Message from the King and memorial service at St Paul's Cathedral
On 24 June 1924, a message sent from King George V to Sir Francis Younghusband of the Mount Everest Committee appeared in The Times, in which the King requested to convey "an expression of his sincere sympathy" to the families and committee concerning the tragic deaths of the "two gallant explorers," Mallory and Irvine. On 17 October 1924, a solemn memorial service at St Paul's Cathedral, London, was held in honour of the two climbers, at which the presiding, Right Reverend Henry Paget, the Bishop of Chester, from whose diocese both men had come, delivered the sermon. The other clergy present included the Archdeacon of London Ernest Holmes, Canon William Newbolt, and Canon Simpson. The parents of both mountaineers, the widow of the deceased, Mrs Christiana Ruth Leigh-Mallory, their relatives and close friends, members of the 1921, 1922, and 1924 Everest expeditions, members of the Mount Everest Committee, the Alpine Club, the Royal Geographical Society, and several other distinguished explorers and scientists also attended. Additionally present were representatives of the royal family; Sir Sidney Robert Greville represented the King; Lieutenant-Colonel Sir Piers Walter Legh, the Prince of Wales; Lieutenant Colin Buist, the Duke of York; Lieutenant-Colonel Douglas Gordon, the Duke of Connaught; and Major Eric Henry Bonham, Prince Arthur of Connaught.

Mallory's will was proven in London on 17 December; he bequeathed his estate of £1706 17s. 6d. (roughly equivalent to £0 in ) to his wife.

Discovery of the ice axe, 1933
On 30 May 1933, at 5:40a.m., during the 1933 British Mount Everest expedition, Percy Wyn-Harris and Lawrence Wager commenced their summit attempt from Camp VI, at 8380.4 m, on the Yellow Band, below the Northeast Ridge. After approximately one hour of climbing, Wyn-Harris, who was leading, found an ice axe located about 18 m below the crest of the Northeast Ridge and some 229 m east of and below the First Step, at an elevation of 8450 m. Wyn-Harris and Wager left the ice axe exactly where the former had discovered it, and after retreating from a failed summit attempt where they had reached approximately the same place as Edward Norton in 1924, at 8572.8 m, Wyn-Harris retrieved the ice axe and presumably left his own in its place. The ice axe, discovered, was positively ascertained to be a possession of either Mallory's or Irvine's, to the exclusion of all others. During his descent with Edward Norton on 4 June 1924, Howard Somervell dropped his ice axe in the Yellow Band near the Norton Couloir, further west from where Wyn-Harris had found the ice axe, and no mountaineers from the Everest expeditions before 1933, other than Mallory and Irvine, were at the location where Wyn-Harris discovered the ice axe. Although it is definitive that the ice axe found by Wyn-Harris was, in fact, Mallory's or Irvine's, there was no decisive evidence to prove which mountaineer owned the axe after its discovery. In 1934, Noel Odell inspected the ice axe when it was shown to him by Wyn-Harris and saw three parallel horizontal nick marks on its shaft, which he learned neither Harris nor Wager had seen. He thought it might have been a mark used by Irvine on some of his equipment, although not verified by visual inspection of such items returned to Irvine's family, some of whom seemed to remember seeing a similar marking. Mallory's widow Ruth informed Odell that, "as far as she was aware"—which may indicate she was not entirely sure—Mallory never marked his equipment with triple marks or any other type of mark and assumed it most probable the axe belonged to Irvine. To Odell, Wyn Harris suggested that a porter may have cut the triple mark on the axe of the shaft to identify his masters' property during the 1924 expedition, though such was not the practice of many, if any, of the 1924 porters. Wyn Harris assured Odell that his porter Pugla cut the X mark, seen lower down on the shaft of the axe found in 1933, during the return journey from the 1933 expedition. A number of the 1933 British Mount Everest expedition members considered it likely that the ice axe belonged to Mallory because it had Swiss manufacturers, Willisch of Täsch, stamped upon it, and Mallory had journeyed to the Alps a short time before the 1924 expedition, when he may have acquired it. They were unaware that this manufacturer had supplied all members of the 1924 expedition with light axes and that Mallory or Irvine might have used them during their fatal summit attempt. In 1962, a brother of Andrew Irvine found a military swagger stick, which is presumed to have belonged to Irvine, and upon it are three horizontal identification nick marks resembling those on the ice axe discovered by Wyn-Harris in 1933; therefore, the axe is possibly Irvine's, but it is inconclusive.

In a 1971 letter published in The Sunday Times, Wyn-Harris recalled that his porter cut the cross mark on the ice axe discovered in 1933:

In July 1977, Walt Unsworth, author of Everest: The Ultimate Book of the Ultimate Mountain, examined the ice axe discovered in 1933 and observed four sets of marks on its shaft. On the axe's shaft, in addition to the three parallel horizontal nick marks seen by Odell and the cross mark cut by Pugla, he saw a single horizontal nick mark above the three observed by Odell and another three nick marks, though fainter in appearance, on the other side of the shaft opposite the cross mark.

Frank Smythe's sighting, 1936
In 1937, Frank Smythe wrote a letter to Edward Norton in reply to Norton's approbation of Smythe's book Camp Six, an account of the 1933 British Mount Everest expedition. Among other things mentioned in his letter was the discovery by Wyn-Harris of the ice axe in 1933 found below the crest of the Northeast Ridge, where Smythe felt certain it marked the scene of an accident to Mallory and Irvine in 1924. Also in the letter, Smythe disclosed to Norton that during the 1936 British Mount Everest expedition, he scanned the North Face of Everest with a high-powered telescope from Base Camp and spotted an object, which he presumed was the body of either Mallory or Irvine and that it was not to be written about because he feared press sensationalism:

Smythe's sighting was unknown to the public until his son Tony revealed the information in his book, My Father, Frank: Unresting Spirit of Everest, released in 2013; the author discovered a copy of the letter that his father had written to Norton in the back of a diary.

Tom Holzel, Mount Everest historian
Everest historian, German-American Thomas Martin Holzel, the co-author with Audrey Salkeld of The Mystery of Mallory and Irvine, first became interested in the Mallory and Irvine mountaineering enigma after reading a brief reference about the subject in a 1970 edition of The New Yorker. Holzel devised a theory regarding the Mallory and Irvine mystery, initially published in the 1971 September edition of Mountain magazine. His theory was that the two mountaineers split up soon after Noel Odell had sighted them ascending the Second Step at 12:50p.m., and when successfully climbed, each had only $1 1/2$ hours of supplemental oxygen remaining, not sufficient for both men to reach the summit in two or three hours from that location. Holzel argued that given this dilemma, Mallory took Irvine's oxygen equipment, belayed him down the Second Step, from where he descended towards Camp VI at 8138 m, and with the additional oxygen, Mallory recommenced the attempt to reach the summit alone. He further surmised that as the exhausted Irvine descended after parting with Mallory shortly after 1:00p.m., the "rather severe blizzard" described by Noel Odell, which lasted from approximately 2:00p.m. until 4:00p.m., covered the mountain with snow, turned his descent into a deadly endeavour, and caused him to slip and fall to his death. Holzel added that Mallory presumably reached the summit in the late afternoon, and during his descent, darkness prevented him from descending the Second Step; left with no alternative, he bivouacked and froze to death overnight. He also theorised that where the ice axe was found—presumably the scene of an accident—by Percy Wyn-Harris in 1933, a body tumbling down the North Face from the area of its discovery would come to a halt on a snow terrace below at approximately 8200 m.

On Valentine's Day, 14 February 1980, Holzel received a letter dated 7 February 1980 from Hiroyuki Suzuki, foreign secretary of the Japanese Alpine Club. Suzuki's letter was in reply to Holzel, who had written to the Japanese inquiring about their 1979 Sino-Japanese Mount Everest reconnaissance expedition and requesting that they look out for Irvine's body—which Holzel had prognosticated might be discovered on a snow terrace at about 8200 m—and the camera he may have carried. The letter from Suzuki contained grievous news and unexpected information. He expressed that on 12 October 1979, at 2:12p.m., as their reconnoitring party attempted to reach the North Col, an avalanche occurred at an elevation of 6850 m that swept three Chinese, Wang Hongbao, Nima Thaxi, and Lou Lan, into a crevasse, resulting in their deaths. In the latter part of the letter, Suzuki told Holzel that on 11 October 1979—the day before the avalanche caused his death—Hongbao informed their expedition climbing leader, Japanese Ryoten Hasegawa, that during the 1975 Chinese Mount Everest expedition, he had seen "two deads." One of them he had seen close to a side moraine in the East Rongbuk Glacier below the 1975 expedition Camp III, and the other was on the Northeast Ridge route at an altitude of 8100 m. Suzuki further expressed in the letter that Hongbao was a non-English speaker but repeated the word "English, English" to Hasegawa. Suzuki added that the first was possibly Maurice Wilson, questioned who the second he saw at 8100 m was, and informed Holzel that Hongbao touched the latter's torn clothes, some of which the wind had blown away, and he buried the corpse by placing snow on it.

The 1986 Mount Everest North Face Research Expedition
On 25 August 1986, the Mount Everest North Face Research Expedition (MENFREE), which Holzel instigated, congregated at Mount Everest's North Base Camp in Tibet. The expedition aimed to resolve the enigma surrounding Mallory and Irvine's disappearance on 8 June 1924. Their primary objective was to ascend to the 8230 m snow terrace, where they intended to locate the remains of the "English dead" Wang Hongbao had sighted during the 1975 Chinese Mount Everest expedition. They assumed that if found, the cameras both mountaineers may have carried would resolve the 62-year-old mystery of whether or not they attained the summit before they died. Their secondary objective was to search the area immediately above the Second Step, where they hoped to discover Mallory and Irvine's empty oxygen cylinders, proving that they had reached that elevation and thus possibly gained the summit. The expedition leader was Andrew Harvard, and the other members were Tom Holzel, Audrey Salkeld, David Breashears, Ken Bailey, Mary Kay Brewster, David Cheeseman, Catherine Cullinane, Sue Giller, Alistair Macdonald, Al Read, Steve Shea, David Swanson, Roger Vernon, Mike Weis, Jed Williamson, Mike Yager, and a team of fifteen Sherpas led by Nawang Yonden. They successfully established Camp V on the North Ridge at an elevation of 7772 m but were hampered by snowstorms and avalanches, which prevented them from reaching 8382 m, where they had planned to establish Camp VI, from which they intended to search for the bodies of Mallory and Irvine. Despite the adverse weather and snow conditions, they discovered two oxygen cylinders from the 1922 British Mount Everest expedition. On 17 October 1986, nine days before the expedition retreated from Mount Everest, one of their team, Sherpa Dawa Nuru, perished in an avalanche below the North Col.

During the Mount Everest North Face Research Expedition, their liaison officer, Zhiyi Song, also a 1975 Chinese Mount Everest expedition member, on which Wang Hongbao had presumably seen "two deads," informed Holzel that he heard about Hongbao's story and declared, "None of it is true. Wang never reported finding an English mountaineer." Holzel asked Song if it was conceivable that Hongbao had discovered an English body and suggested that perhaps he did not officially report it and only informed his friends. Song knowledgeably replied, "If that is so," he knew who Hongbao's mountaineering partners were in 1975 and that Holzel could meet them on the return journey to Peking, China. In Lhasa, Tibet, after the cessation of the Mount Everest North Face Research Expedition, Song introduced Holzel to Chen Tianliang, Hongboa's 1975 group climbing leader. During the interview with Holzel, Tianliang denied that Hongbao had discovered an English body at 8100 m in 1975 and asserted that he would know because he was with Hongbao the entire time they were at high altitudes on Everest. Tianliang was positive that if Hongbao had come across mortal remains, it must have only been those of a missing Chinese mountaineer whom Tianliang was assigned to search for and who was located a few days later by expedition members. As the interview continued, Tianliang agreed with Holzel that Hongbao could not have found the remains of the missing Chinese climber because he would have identified and reported his find immediately. As their conversation neared its conclusion, Holzel asked Tianliang if there were anything he would like to add, and Tianliang declared that during a rest period at Camp VI, he received a radio call instructing him to ascend to Camp VII to search for the missing climber. Tianliang and a Tibetan porter left Camp VI and ascended to Camp VII to search, leaving two remaining climbers at Camp VI, Wang Hongbao and Zhang Junyan. Holzel asked Tianliang did he think it possible that Hongbao might have found an English body's mortal remains after he and his porter departed for Camp VII, and Tianliang conceded that it was conceivable and added that Zhang Junyan now resided in Peking. Zhiyi Song, the research expeditions' liaison officer, arranged a meeting for Holzel in Peking with Zhang Junyan. At the interview, through his interpreter, Holzel questioned Junyan about what had occurred at Camp VI after Tianliang and his porter left to search for the missing Chinese climber. Junyan stated that he remained in his sleeping bag, and Hongbao exited the tent to go for a walk; he was gone for approximately twenty minutes, and later, as they descended, Hongbao informed him that during his walk, he had discovered the remains of a foreign mountaineer and that Hongbao had also mentioned this to a few additional climbers.

The 1999 Mallory and Irvine Research Expedition
The 1999 Mallory and Irvine Research Expedition was funded jointly by WGBH/Boston's Nova series and the BBC. The Seattle-based Internet site MountainZone, sponsored by Lincoln LS, also provided daily expedition dispatches on their website. The expeditions' other sponsors were Mountain Hardwear, Outdoor Research, Lowe Alpine, Eureka!, Starbucks, PowerBar, Vasque Footwear, Slumberjack, and Glazer's Camera. The expedition personnel were Eric Simonson, mountaineer and expedition leader; mountaineer and high-altitude cameraman Dave Hahn; and mountaineer and assistant film producer Graham Hoyland. Mountaineers Conrad Anker, Jake Norton, Tap Richards, and Andy Politz. Mountaineering historian, researcher, and support climber Jochen Hemmleb; mountaineering historian, researcher, and expedition organiser Larry Johnson; and expedition doctor Lee Meyers. High-altitude cameraman Thom Pollard; film producers Liesl Clark and Peter Firstbrook; film sound technician Jyoti Lal Rana; photographer Ned Johnston; and a team of twelve Sherpas led by Sirdar Dawa Nuru. The expedition's objective was to search for evidence of the 1924 British Mount Everest expedition and to obtain information about the high point attained by Mallory and Irvine, which may have either supported or refuted whether or not they reached the summit.

After he had re-examined the historical record of Mount Everest North Face expeditions, Jochen Hemmleb recognised that the only seemingly factual information about Mallory and Irvine—other than artefacts such as the ice axe, found in 1933—was that during the 1975 Chinese Mount Everest expedition, Wang Hongbao had discovered a body that he had intransigently expressed as "English, English!" during what he asserted was a brief twenty-minute walk from Camp VI. The initial challenge was to identify the location of the 1975 Chinese Camp VI and use it as the centre point of a circular search zone with a twenty-minute walk or more, if necessary, radius. From a photograph of the 1975 Camp VI, published in the book Another Ascent of the World's Highest Peak—Qomolangma, Hemmleb predictably determined that the Camp was on an ill-defined rib of rock that bisects the snow terrace on the North Face. On 1 May 1999, at approximately 10:00a.m., Anker, Hahn, Norton, Politz, and Richards reached 8199 m, where they were to establish Camp VI. From there, the five mountaineers set out at 10:30a.m. for the "ill-defined rib" identified in Hemmleb's search guidelines and traversed west over the North Face's precipitously angled terrain. Anker searched on intuition and descended to the lower margin of the snow terrace, where it drops away approximately 2000 m to the head of the central Rongbuk Glacier and soon after zig-zagging back up the slope in the direction of Camp VI, he looked to the west and saw a "patch of white," which he proceeded towards, and ascertained that it was an old body; it was 11:45a.m., and 8156 m was the elevation where the corpse lay. The body was partially frozen into the scree and well preserved due to the cold, dry air and constant freezing temperatures; it was lying prone, fully extended, with both arms somewhat outstretched and the head pointed uphill. The right leg had broken, and the left leg was crossed over it, possibly for protection, suggesting the mountaineer was still consciously aware after coming to rest. The rear of the body was predominantly exposed, as the clothing had been partially destroyed by the elements and blown away by the wind. The exposed skin was bleached white, and although the corpse was frozen, purportedly, some elasticity remained in the frozen tissue; the hands and forearms appeared dark. Despite the body being notably intact, Everest's goraks had damaged the right leg, the buttocks, and the abdominal cavity by pecking at them and consuming most of the internal organs. Tied to the corpse's waist were the remnants of a braided cotton climbing rope, some tangled around the body, from which its broken, frayed end trailed. On the right foot was an intact green leather hobnailed boot; only the tongue of the left boot remained, jammed between the left foot's bare toes and the heel of the right boot.

The prevalent assumption was that Irvine had fallen in 1924 from where, in 1933, Percy Wyn-Harris had discovered the ice axe, presumably Irvine's; therefore, Anker, Hahn, Norton, and Richards expected the body to be his, but Politz said, "This is not him." When they found the remains, before they touched them and determined who it was, they documented photographically and cinematographically both the body and the discovery site. Richards, an archaeologist by training, and Norton carefully separated the remaining layers of tattered garments, protected somewhat from the elements that still covered part of the body: multiple layers of cotton, silk underwear, a flannel shirt, woollen pullover and pants, and an outer garment that resembled canvas. Close to the nape of the neck, Norton turned over part of the shirt collar and found affixed to it a clothing label with red print, reading, "W.F. Paine, 72 High Street, Godalming," and below it a second label, again with red print, reading, "G. Mallory." They discovered another label with "G. Leigh. Ma," written in black, and a third label. The expedition members realised, to their surprise, that they had not found Irvine as expected but had discovered the remains of Mallory. Because the corpse had frozen into the surrounding scree, the mountaineers used their ice axes and pocketknives to excavate the site to find crucial artefacts and, most importantly, Howard Somervell's Vest Pocket Kodak camera that he "allegedly" had lent to Mallory for his summit attempt with Irvine. Presumably, if they had discovered the camera, it might have solved the mystery of whether or not the summit of Mount Everest was reached for the first time in 1924, twenty-nine years before the first confirmed successful ascent of the world's highest peak by Edmund Hillary and Tenzing Norgay on 29 May 1953. Experts from Eastman Kodak Company have said that it might be possible to develop images from the camera's film using sophisticated techniques and have drawn up specific professional guidelines for an expedition that might discover the camera.

The injuries on Mallory's body were severe; above the hobnail boot on his right foot, both the tibia and fibula of his right leg—which lay at a grotesque angle—were broken. His right scapula was somewhat deformed, and his right elbow was fractured or dislocated. Along his right side were multiple still-noticeable cuts, bruises, and abrasions; on his torso, his ribs had fractured, and black and blue bruises were visible on his chest's skin. The broken climbing rope, which had been looped around his waist and secured with a bowline knot, had severely crushed his ribs and burned his skin; the indentation marks caused by the rope tugging on his skin were still observable around his torso; undoubtedly, he had fallen. The rope-jerk injuries around Mallory's torso indicate that he and Irvine were roped to each other when the accident occurred; the exact circumstances surrounding their deaths are unknown.

After chipping at the ice and rock for one hour with their axes, the expedition members had freed one jacket pocket in which they discovered an altimeter manufactured by Cary, London, that could record altitude to a maximum of 9144 m; broken was its crystal and the hands were absent. Norton reached underneath Mallory's body and found a pouch that hung from his neck. After cutting the pouch's underside with his knife, he discovered a tin of Brand & Co's Savoury Meat Lozenges. Also found were a pair of nail scissors in a leather case and a letter inside an envelope, flawlessly preserved. Other artefacts were discovered in a pouch on Mallory's right side and from separate pockets: a handkerchief—wrapped around some letters. addressed to Mallory—with a burgundy, blue, and green foulard pattern, decorated with the monogram G.L.M.; a second-handkerchief with a red, yellow, and blue pattern, also monogrammed with the initials G.L.M.; a tube of petroleum jelly wrapped in a white handkerchief; one fingerless glove; a W.E. Oates of Sheffield manufactured Lambfoot antler-handle pocket knife with a leather case; an intact box of still usable Swan Vestas matches; and a variety of boot laces and straps. Other artefacts found were: a pencil and safety pin; adjustable straps attached to a metal spring clip—used to connect an oxygen mask to Mallory's fur-lined leather helmet; a note from expedition member Geoffrey Bruce; gear checklists, written by pencil on scraps of paper; a bill addressed to G.H. Leigh Mallory, Esq., Herschel House, Cambridge, from A.W. Gamage Ltd, Holborn, London, E.C.1.; and discovered deep inside a pocket was a pair of unbroken snow goggles. The artefacts and samples of each layer of garments were placed one by one in resealable plastic Ziploc bags for examination. To the dismay of Anker, Hahn, Norton, Richards, and Politz, the most sought-after artefact, the Vest Pocket Kodak camera that Mallory had "allegedly" borrowed from Somervell, was not found after a thorough search. With the prior permission of Mallory's son, John Mallory, Anker cut a small skin sample from Mallory's right forearm for DNA analysis. The five expedition mountaineers buried Mallory by covering his remains with rocks, and Politz read a Church of England committal ceremony provided by Barry Rogerson, the Anglican Bishop of Bristol.

On 16 May 1999, expedition members Andy Politz and Tom Pollard returned to Mallory's burial site for one last search for the camera that he had reportedly carried, this time using a metal detector. After removing the rocks that covered his remains, Politz, using the metal detector, discovered a Borgel wristwatch in Mallory's pants pocket—an artefact the team had missed during their initial search on 1 May 1999. At the time of its discovery, the watch's crystal and minute hand were missing, and neither were discovered in Mallory's pocket or elsewhere; the second hand and hour hand were still in place on the watch when found; subsequently, the hour hand became dislodged from the watch. Politz also recovered a piece of Mallory's climbing rope—brittle from seventy-five years of exposure to the elements—and removed the hobnail boot from Mallory's right foot to add to the assemblage of artefacts. Again, the search for a camera proved unsuccessful after they thoroughly searched the site using the metal detector. Pollard resolved that he wanted to see Mallory's face frozen into the scree and remove the ice and dirt surrounding his head. After excavating, he had uncovered and freed Mallory's head adequately so that he could lie on the ground and look straight at his face, which was, to a small extent, distorted; his eyes were closed; there was stubble on his chin; and on his forehead above his left eye was a puncture wound from which two pieces of skull protruded; and there was dried blood. Politz and Pollard reburied Mallory's remains by covering him with rocks and then repeated the committal ceremony. Expedition leader Eric Simonson discovered an old oxygen bottle below the First Step on 15 May 1991, the same day he reached the summit of Everest for the first time and subsequently realised that it may have belonged to one of the pioneering British Mount Everest expeditions. On 17 May 1999, at 2:00a.m., Anker, Hahn, Norton, Richards, and two Sherpas, Dawa and Ang Pasang, left Camp VI at 8200 m and began their summit bid. At about 10:30a.m., Norton, Richards, and the two Sherpas abandoned, retreating at an altitude of circa c. 8560 m between the First and Second Steps; Anker and Hahn would later reach the summit at 2:50p.m. Shortly after Norton and Richards had decided to retreat, they radioed Eric Simonson at Advanced Base Camp and informed him about their decision, and Simonson asked them to search for the oxygen cylinder he had found in 1991. After approximately half an hour of searching, Richards radioed A.B.C. and stated that he had discovered an oxygen cylinder at a location subsequently established as c. 170 m to 180 m horizontally east from the top of the First Step and at an altitude of c.  8470 m to 8475 m. The oxygen cylinder's shape, size, valve assembly, and stamp, no 9, E.O.C. (Everest Oxygen Cylinder), conclusively confirmed that the bottle had belonged to the 1924 British Mount Everest expedition and had been used by Mallory and Irvine, as they were the only party who had used oxygen for a summit attempt. The no 9, stamped on the bottle, corresponded to the no 9 written by Mallory—as part of a list of oxygen cylinders he and Irvine took on their summit bid—on the envelope, addressed to him from "Stella," which also contained a letter from her, discovered on Mallory's body on 1 May 1999. Sir Edmund Hillary—recognised, along with Tenzing Norgay, as the first mountaineers to have reached the summit of Mount Everest—enthusiastically welcomed the news of the discovery of Mallory's body and described it as "very appropriate" that Mallory might have summited decades earlier. "He was really the initial pioneer of the whole idea of climbing Mount Everest," Hillary said.

Further research expeditions
The 2001 Mallory and Irvine Research Expedition was led by 1999 expedition leader Eric Simonson and was composed of new and returning members, and their objective was to conduct further historical research. On 28 April 2001, expedition members Jake Norton and Brent Okita discovered the remnants of the 1924 British Mount Everest expeditions' Camp VI on the North Ridge at an altitude of 8138 m, from which Mallory and Irvine had departed on the morning of 8 June 1924, the day of their ill-fated summit attempt. The following day, 29 April 2001, Norton discovered a woollen mitten of unknown origin on the Northeast Ridge at an altitude of 8440 m, but it may have probably belonged to either Mallory or Irvine. There were further research initiatives on Mount Everest in 2004, 2010, 2011, 2012, 2018, and 2019, and in 2007, the Altitude Everest Expedition retraced Mallory and Irvine's footsteps.

The difficult "Second Step"
If Mallory and Irvine had chosen the Northeast Ridge route to reach Everest's summit, they would have had to free-climb the formidable Second Step. Of the Three Steps on the upper Northeast Ridge, the Second and most prominent, rising approximately 30.48 m and comprised of precipitous, brittle rock at an extreme altitude of 8610 m, is the most demanding. The final upper section of the Second Step is its crux, a 4.87 m nearly vertical headwall slab to which the 1975 Chinese Mount Everest expedition affixed a 4.6 m aluminium ladder, later replaced in 2007. Although disputed, the first successful ascent of the Second Step occurred on 24 May 1960, during the summit attempt of the 1960 Chinese Mount Everest expedition, as all four of the summit party were breathing supplemental oxygen. They used a technique called "courte-échelle" (short ladder) in which Chu Yin-hau stood on Liu Lien-man's shoulders to successfully climb to the top of the Second Step's crux. Chu Yin-hau then belayed himself to a rock at the top of the Step and brought Liu Lien-man, Wang Fu-chou, and Konbu up on the rope. It took three hours for the four Chinese mountaineers to ascend the 4.87 m crux of the Second Step, and they also used pitons, which neither Mallory nor Irvine had in 1924.

On 28 August 1985, in full-monsoon conditions and without supplementary oxygen, Òscar Cadiach, climbing on lead, achieved the first successful free-climb of the Second Step, ascending the crux on belay with a sling tied to one of the rungs of the Chinese ladder and he graded the vertical crack that forms the crux V+ (5.7–5.8). On 17 May 1999, during the 1999 Mallory and Irvine Research Expedition, member Conrad Anker, belayed by Dave Hahn, attempted to free-climb the Second Step's crux to the Chinese ladder's left but failed after being forced to step onto one of the rungs of the ladder. Anker rated the climb 5.10 and considered it beyond the capabilities of Mallory and Irvine in 1924. On 22 May 2001, Austrian Theo Fritsche free-climbed the crux headwall of the Second Step, free-solo style, without supplementary oxygen and assessed the climb as having a grade of IV+ to V- (5.6–5.7). On 22 May 2003, Russian Nickolay Totmjanin, to avoid the crowd and the possibility of developing frostbite, free-climbed the 4.87 m crux of the Second Step without supplementary oxygen in an unknown style and provided no opinion of the climbing grade. On 14 June 2007, as part of the 2007 Altitude Everest expedition, Conrad Anker and Leo Houlding successfully free-climbed the Second Step's crux headwall, having first removed the Chinese ladder, with the former rating it 5.10 and the latter 5.9; Anker changed his 1999 opinion, stating, "Mallory and Irvine could have climbed it."

Western Disturbance
Research, published in the August 2010 edition of the Royal Meteorological Society's Journal, Weather, and authored by George William Kent Moore, John Semple, and Dev Sikka, indicates that an extreme storm may have contributed to the deaths of Mallory and Irvine. George William Kent Moore, a physicist at the University of Toronto, Canada, discovered meteorological data from the 1924 Expedition at the Royal Geographical Society's library in London, which formed the basis of their research.

The data consisted of daily barometric pressure and temperature measurements recorded at Base Camp in 1924 at 5029 m. Temperature measurements were recorded at several higher camps, also. The data collected during the 1924 Expedition, together with a manually analysed sea-level pressure map hand-drawn by the Indian Department of Meteorology, were used to show that Mallory and Irvine's summit attempt on 8 June 1924 occurred during a period when there was a drop in barometric pressure and temperature on Mount Everest, which was likely the result of the passage of an upper-level trough. This meteorological phenomenon is known locally as a Western Disturbance. The authors hypothesised that the passage of the disturbance possibly triggered an outbreak of convective activity that resulted in the blizzard, witnessed by observation, engulfing Everest during Mallory and Irvine's summit attempt. Noel Odell described the morning of 8 June 1924 as "clear and not unduly cold," with snowfall and increasing winds beginning at approximately 2:00p.m., which he described as a "rather severe blizzard," lasting about two hours and possibly severe enough to force Mallory and Irvine to abandon their summit bid. Records show a drop in barometric pressure at Base Camp of 18 millibars during the summit attempt. A drop of a similar magnitude possibly occurred at higher altitudes on the Himalayan peak during this time. This decrease in barometric pressure likely induced aggravation of their hypoxic state. Also, if they had run out of supplemental oxygen during the early afternoon of 8 June 1924, this would have further exacerbated their hypoxic condition. The cumulative effects of hypoxia, fatigue and bitter cold during a severe blizzard would have left Mallory and Irvine at the limits of their endurance. Although the full details of what happened to Mallory and Irvine during their ill-fated summit attempt are unknown, the authors, in conclusion, believe there is persuasive evidence that the severe weather they experienced during their summit attempt may have been more extreme than previously thought. The harsh weather and the decreased barometric pressure may have contributed to their tragic demise.

Climbing partners
Harry Edmund Guise Tyndale, one of Mallory's climbing partners, said of Mallory: "He cut a superb staircase, with inimitable ease and grace and a perfect economy of effort. In watching George at work one was conscious not so much of the physical strength as of suppleness and balance; so rhythmical and harmonious was his progress in any steep place, above all on slabs, that his movements appeared almost serpentine in there smoothness."

Geoffrey Winthrop Young, an accomplished mountain climber, held Mallory's ability in awe: "His movement in climbing was entirely his own. It contradicted all theory. He would set his foot high against any angle of smooth surface, fold his shoulder to his knee, and flow upward and upright again on an impetuous curve. Whatever may have happened unseen the while between him and the cliff, in the way of holds or mutual adjustments, the look, and indeed the result, were always the same—a continuous undulating movement so rapid and so powerful that one felt the rock must either yield, or disintegrate."

Edmund Hillary's assessment
Edmund Hillary, the first mountaineer, together with Tenzing Norgay, to summit Mount Everest, argued: "If you climb a mountain for the first time and die on the descent, is it really a complete first ascent of the mountain? I'm rather inclined to think, personally, that maybe it's quite important, the getting down. And the complete climb of a mountain is reaching the summit and getting safely to the bottom again."

Hillary's daughter, Sarah, when asked about her father's take on the debate, said: "His view was that he had got 50 good years out of being conqueror of Everest and, whatever happened, he wasn't particularly worried. That's my feeling as well."

Chris Bonington's assessment
Chris Bonington, the British mountaineer, argued: "If we accept the fact that they were above the Second Step, they would have seemed to be incredibly close to the summit of Everest and I think at that stage something takes hold of most climbers ... And I think therefore taking all those circumstances in view ... I think it is quite conceivable that they did go for the summit ... I certainly would love to think that they actually reached the summit of Everest. I think it is a lovely thought and I think it is something, you know, gut emotion, yes I would love them to have got there. Whether they did or not, I think that is something one just cannot know."

Reinhold Messner's assessment
Reinhold Messner, the Italian mountaineer and first to climb all 14 eight-thousanders gave his opinion: "Suddenly they see a huge rock step towering over them ... Scaling it is impossible—it is far too high, too smooth, too exposed. Mallory risks a look at the arête on the left: unthinkable ... It is impossible to climb any farther ... Having failed to surmount the Second Step, Mallory and Irvine begin their descent ... Night is falling quickly. Their descent is made even more dangerous by a brewing snowstorm ... As it gets darker and the intensity of the storm increases, they became desperate to make it back to camp ... They know that in these conditions, no one survives unprotected. Their oxygen runs out ... Lethargy forces them to stop after every step, and they have difficulty finding secure footholds ... The circumstances are ripe for an accident."

Conrad Anker's assessment
Conrad Anker, who found Mallory's body in 1999, free climbed the Second Step in 2007, and has worn replica 1924 climbing gear on Everest, said he believes it is "possible, but highly improbable, that they made it to the top," citing the difficulty of the Second Step and the position of Mallory's body. He said that in his opinion: "I don't believe they made it, and I'm not saying that to make Mallory less than what he is. I don't think it's fair to say that, oh, that he made it because he was a great climber; he was the first. The climbing up there is so difficult, and I think that Mallory was a very good climber. And part of being a good climber is knowing when you're at too much of a risk, and it's time to turn back. I think he saw that. He turned back, and it was either he or Irvine; as they were descending the Yellow Band, slipped and pulled the other one off; the rope snapped, and then he came to his rest."

Robert Graves' tale of Mallory's Pipe
Robert Graves, who climbed with Mallory, recounts in his autobiography Good-Bye to All That this story, at the time famous in climbing circles, about an ascent that Mallory made as a young man in 1908, now known as Mallory's Slab: "My friend George Mallory ... once did an inexplicable climb on Snowdon. He had left his pipe on a ledge, half-way down one of the Lliwedd precipices, and scrambled back by a shortcut to retrieve it, then up again by the same route. No one saw what route he took, but when they came to examine it the next day for official record, they found an overhang nearly all the way. By a rule of the Climbers' Club, climbs are never named in honour of their inventors but only describe natural features. An exception was made here. The climb was recorded as follows: 'Mallory's Pipe, a variation on Route 2; see adjoining map. This climb is totally impossible. It has been performed once, in failing light, by Mr G. H. L. Mallory.'"

Legacy
At Winchester College, where Mallory was a scholar from 1900 to 1905, there is a memorial to him in the cloister adjacent to the college chapel. Mallory was honoured by having a court named after him at his alma mater, Magdalene College, Cambridge, where he was an undergraduate from 1905 to 1908 and a graduate from 1908 to 1909, with an inscribed stone commemorating his death set above the doorway to one of the buildings. To memorialise Mallory's position as Magdalene Boat Club Captain from 1907 to 1908, the Friends of Magdalene Boat Club changed their name to the Mallory Club, a boat club for alums of the Magdalene Boat Club. A bronze memorial plaque commemorates him in the South African Cloisters at Charterhouse, where Mallory was a schoolmaster from 1910 to 1921. A stained-glass triptych window at St Wilfrid's Church, Mobberley, Cheshire, portraying three figures from English mythology, Saint George, King Arthur and Sir Galahad, also has two panels, one on the lower right and the other on the lower left, with both having inscriptions commemorating Mallory. Also in the church is a brass plate memorialising Mallory's brother, Sir Trafford Leigh-Mallory. In addition to his father, Herbert Leigh Mallory, the rector of Mobberley, Mallory's grandfather, George Leigh Mallory (1806–1885), was also the parish's rector. In the cloisters of Chester Cathedral, there is a joint memorial window commemorating both Mallory and Irvine. Two high peaks in California's Sierra Nevada, Mount Mallory and Mount Irvine, located 2.64 mi and 2.25 mi southeast of Mount Whitney, respectively, are named after them.

The Times obituary of George Finch called Mallory and Finch the "two best alpinists of [their] time."

Tragedy in the mountains has proved a recurring theme in the Mallory line; Mallory's younger brother, Air Chief Marshal Sir Trafford Leigh-Mallory, met his death on a mountain range when the Avro York carrying him to his new appointment as Air Commander-in-Chief of South East Asia Command crashed in the French Alps, 1.24 mi west of Le Rivier d'Allemont, on 14 November 1944, killing all on board. Mallory's daughter, Frances Clare, married physiologist Glenn Allan Millikan, who was killed in a climbing accident on 25 May 1947 at Buzzard's Roost in Fall Creek Falls State Park, Tennessee.

Frances Mallory's sons, Richard and George Millikan, became respected climbers during the 1960s and 1970s. On 16 July 1963, Richard Millikan and six other members of the Harvard Mountaineering Club, David Roberts, Henry L. Abrons, Pete Carman, Chris Goetze, John Graham and Don Jensen, made the first ascent of the central rib of the Wickersham Wall on the north face of Mount McKinley, reaching North Peak at 5934 m. On 14 May 1995, together with six other climbers, George Mallory, the grandson of Mallory, reached the summit of Everest via the North Col-North Ridge-Northeast Ridge route as part of an American Everest expedition and evoked a sense of "unfinished business" by leaving a photograph of his grandparents on the summit.

Mallory was captured on film by expedition cameraman John Noel, who released his film of the 1924 expedition, The Epic of Everest. Film director George Lowe used footage from The Epic of Everest in the 1953 documentary, The Conquest of Everest. A documentary on the 2001 Mallory and Irvine Research Expedition, Found On Everest: Detectives on the Roof of the World, was produced by Riley Morton. Brian Blessed played Mallory in Galahad of Everest, a 1991 re-creation of his last climb. In Anthony Geffen's 2010 documentary film about Mallory's life and final expedition, The Wildest Dream, Conrad Anker and Leo Houlding attempt to reconstruct the climb, dressed and equipped like Mallory and Irvine.

Everest, a proposed Hollywood version of the 1924 attempt, adapted from Jeffrey Archer's 2009 novel Paths of Glory, to be directed by Doug Liman, had first Tom Hardy and then Benedict Cumberbatch slated to play Mallory, but a June 2014 interview with Liman implied that the film was no longer in production. As of late 2021, it is in production again, with Liman directing and Ewan McGregor starring as Mallory. It was announced in April 2015 that Michael Sheen would play Mallory in a biopic titled In High Places, to be written and directed by James McEachen; his website currently states it has not received funding.

In September 2009, a temporary exhibition detailing Mallory and Irvine's lives opened at the Salt Museum (now Weaver Hall Museum and Workhouse), Northwich, Cheshire, near Mobberley, Mallory's place of birth. The exhibition, "Above the Clouds – Mallory and Irvine and the Quest for Everest," was curated by Matt Wheeler and featured items discovered in May 1999 on Mallory's body and many artefacts and photographs from the 1924 British Mount Everest expedition. It was one of the most extensive exhibitions ever conducted on the topic, and it later toured Irvine's birthplace, Birkenhead, Cheshire, at the Williamson Art Gallery and Museum. On 12 May 2010, in London, it came "jointly highly commended" after being nominated in the Museums and Heritage Awards for Excellence.

During Mallory's lecture tour of the United States and Canada in early 1923, when asked why he wanted to climb Mount Everest, he purportedly answered, "Because it's there." Mallory and the phrase were referenced by President John F Kennedy on 12 September 1962, in his speech at Rice University about the nation's space effort (often referred to as the "We choose to go to the Moon" speech), regarded as one of the greatest speeches of the 20th century.

Belgian rock band Girls in Hawaii's song "Mallory's Height" on their 2013 album Everest is a homage to Mallory. Extracts of the Nova / BBC broadcast can be heard (around 3:35).