German Army (1935–1945)

The German Army (Heer, ; lit. 'army') was the land forces component of the Wehrmacht, the regular armed forces of Nazi Germany, from 1935 until it effectively ceased to exist in 1945 and then was formally dissolved in August 1946. During World War II, a total of about 13.6 million soldiers served in the German Army. Army personnel were made up of volunteers and conscripts.

Only 17 months after Adolf Hitler announced the German rearmament programme in 1935, the army reached its projected goal of 36 divisions. During the autumn of 1937, two more corps were formed. In 1938 four additional corps were formed with the inclusion of the five divisions of the Austrian Army after the Anschluss in March. During the period of its expansion under Hitler, the German Army continued to develop concepts pioneered during World War I, combining ground and air assets into combined arms forces. Coupled with operational and tactical methods such as encirclements and "battle of annihilation", the German military managed quick victories in the two initial years of World War II, a new style of warfare described as Blitzkrieg (lightning war) for its speed and destructive power.

Structure
The Oberkommando des Heeres (OKH) was Nazi Germany's Army High Command from 1936 to 1945. In theory, the Oberkommando der Wehrmacht (OKW) served as the military general staff for the Reich's armed forces, co-ordinating the Wehrmacht 's (Heer, Kriegsmarine, Luftwaffe, and the Waffen-SS) operations. In practice, the OKW acted in a subordinate role to Hitler's personal military staff, translating his ideas into military plans and orders, and issuing them to the three services. However, as World War II went on, the OKW found itself exercising an increasing amount of direct command authority over military units, particularly in the west. This meant that by 1942, the authority of the Army High Command (OKH) was limited to the Eastern Front.

The Abwehr was the army intelligence organisation from 1921 to 1944. The term Abwehr (German for "defence", here referring to counterintelligence) had been created just after World War I as an ostensible concession to Allied demands that Germany's intelligence activities be for defensive purposes only. After 4 February 1938, the name Abwehr was changed to the Overseas Department/Office in Defence of the Armed Forces High Command (Amt Ausland/Abwehr im Oberkommando der Wehrmacht).

Germany used a system of military districts (German: Wehrkreis) in order to relieve field commanders of as much administrative work as possible and to provide a regular flow of trained recruits and supplies to the field forces. The method the OKW adopted was to separate the Field Army (OKH) from the Home Command (Heimatkriegsgebiet) and to entrust the responsibilities of training, conscription, supply, and equipment to Home Command.

Organisation of field forces
The German Army was mainly structured in army groups (Heeresgruppen) consisting of several armies that were relocated, restructured, or renamed in the course of the war. Forces of allied states, as well as units made up of non-Germans, were also assigned to German units.

For Operation Barbarossa in 1941, the army forces were assigned to three strategic campaign groupings:
 * Army Group North with Leningrad as its campaign objective
 * Army Group Centre with Smolensk as its campaign objective
 * Army Group South with Kiev as its campaign objective

Below the army group level forces included field armies – panzer groups, which later became army level formations themselves, corps, and divisions. The army used the German term Kampfgruppe, which equates to battle group in English. These provisional combat groupings ranged from corps size, such as Army Detachment Kempf, to commands composed of companies or even platoons. They were named for their commanding officers.

Select arms of service

 * Afrika Korps (Africa Corps)
 * Feldgendarmerie (Field Military Police)
 * Feldjägerkorps (Field Police Corps)
 * Gebirgsjäger (Mountain Troops)
 * Geheime Feldpolizei (Secret Field Police)
 * Ostlegionen (Eastern Legions)
 * Panzergrenadier (Mechanized Infantry)
 * Panzerjäger (Anti-Tank Troops)
 * Panzerwaffe (Armoured Forces)
 * Nachrichtentruppe (Signal Corps)

Doctrine and tactics
The German operational doctrine emphasized sweeping pincer and lateral movements meant to destroy the enemy forces as quickly as possible. This approach, referred to as Blitzkrieg, was an operational doctrine instrumental in the success of the offensives in Poland and France. Blitzkrieg has been considered by many historians as having its roots in precepts developed by Fuller, Liddel-Hart, and Hans von Seeckt, and even having ancient prototypes practised by Alexander the Great, Genghis Khan, and Napoleon. Recent studies of the Battle of France also suggest that the actions of either Erwin Rommel or Heinz Guderian or both of them (both had contributed to the theoretical development and early practices of what later became Blitzkrieg prior to World War II), ignoring orders of superiors who had never foreseen such spectacular successes and thus prepared much more prudent plans, were conflated into a purposeful doctrine and created the first archetype of Blitzkrieg, which then gained a fearsome reputation that dominated the Allied leaders' minds. Thus  'Blitzkrieg' was recognised after the fact, and while it became adopted by the Wehrmacht, it never became the official doctrine nor got used to its full potential because only a small part of the Wehrmacht was trained for it and key leaders at the highest levels either focused on only certain aspects or even did not understand it.

Max Visser argues that the German Army focused on achieving high combat performance rather than high organisational efficiency (like the US Army). It emphasised adaptability, flexibility, and decentralised decision making. Officers and NCOs were selected based on character and trained towards decisive combat leadership. Good combat performance was rewarded. Visser argues this allowed the German Army to achieve superior combat performance compared to a more traditional organisational doctrine like the American one; while this would be ultimately offset by the Allies' superior numerical and materiel advantage, Visser argues that this allowed the German Army to resist far longer than if it had not adopted this method of organisation and doctrine. Peter Turchin reports a study by US colonel Trevor Dupuy found that German combat efficiency was higher than both the British and US armies – if a combat efficiency of 1 was assigned to the British, then the Americans had a combat efficiency of 1.1 and the Germans of 1.45. This would mean British forces would need to commit 45% more troops (or arm existing troops more heavily to the same proportion) to have an even chance of winning the battle, while the Americans would need to commit 30% more to have an even chance.

Tactics
The military strength of the German Army was managed through mission-based tactics (Auftragstaktik) (rather than detailed order-based tactics), and an almost proverbial discipline. Once an operation began, whether offensive or defensive, speed in response to changing circumstances was considered more important than careful planning and co-ordination of new plans.

In public opinion, the German military was and is sometimes seen as a high-tech army, since new technologies that were introduced before and during World War II influenced its development of tactical doctrine. These technologies were featured by Nazi propaganda, but were often only available in small numbers or late in the war, as overall supplies of raw materials and armaments became low. For example, lacking sufficient motor vehicles to equip more than a small portion of their army, the Germans chose to concentrate the available vehicles in a small number of divisions which were to be fully motorised. The other divisions continued to rely on horses for towing artillery, other heavy equipment and supply-wagons, and the men marched on foot or rode bicycles. At the height of motorisation only 20 per cent of all units were fully motorised. The small German contingent fighting in North Africa was fully motorised (relying on horses in the desert was near to impossible because of the need to carry large quantities of water and fodder), but the much larger force invading the Soviet Union in June 1941 numbered only some 150,000 trucks and some 625,000 horses (water was abundant and for many months of the year horses could forage – thus reducing the burden on the supply chain). However, the production of new motor vehicles by Germany, even with the exploitation of the industries of occupied countries, could not keep up with the heavy loss of motor vehicles during the winter of 1941–1942. From June 1941 to the end of February 1942 German forces in the Soviet Union lost some 75,000 trucks to mechanical wear and tear and combat damage – approximately half the number they had at the beginning of the campaign. Most of these were lost during the retreat in the face of the Soviet counteroffensive from December 1941 to February 1942. Another substantial loss was incurred during the defeat of the German 6th Army at Stalingrad in the winter of 1942–1943. These losses in men and materiel led to motorised troops making up no more than 10% of total Heer forces at some points of the war. In offensive operations the infantry formations were used to attack more or less simultaneously across a large portion of the front so as to pin the enemy forces ahead of them and draw attention to themselves, while the mobile formations were concentrated to attack only narrow sectors of the front, breaking through to the enemy rear and surrounding him. Some infantry formations followed in the path of the mobile formations, mopping-up, widening the corridor manufactured by the breakthrough attack and solidifying the ring surrounding the enemy formations left behind, and then gradually destroying them in concentric attacks. One of the most significant problems bedeviling German offensives and initially alarming senior commanders was the gap created between the fast moving "fast formations" and the following infantry, as the infantry were considered a prerequisite for protecting the "fast formations" flanks and rear and enabling supply columns carrying fuel, petrol, and ammunition to reach them.

In defensive operations the infantry formations were deployed across the front to hold the main defense line and the mobile formations were concentrated in a small number of locations from where they launched focused counterattacks against enemy forces who had broken through the infantry defense belt. In autumn 1942, at El Alamein, a lack of fuel compelled the German commander, Field Marshal Erwin Rommel, to scatter his armoured units across the front in battalion-sized concentrations to reduce travel distances to each sector rather than hold them concentrated in one location. In 1944 Rommel argued that in the face of overwhelming Allied air power, the tactic of employing the concentrated "fast formations" was no longer possible because they could no longer move quickly enough to reach the threatened locations because of the expected interdiction of all routes by Allied fighter-bombers. He therefore suggested scattering these units across the front just behind the infantry. His commanders and peers, who were less experienced in the effect of Allied air power, disagreed vehemently with his suggestion, arguing that this would violate the prime principle of concentration of force.

Campaigns
The infantry remained foot soldiers throughout the war; artillery also remained primarily horse-drawn. The motorized formations received much attention in the world press in the opening years of the war, and were cited as the main reason for the success of the German invasions of Poland (September 1939), Denmark and Norway (1940), Belgium, France, and the Netherlands (May 1940), Yugoslavia (April 1941), and the initial stages of Operation Barbarossa, the invasion of the Soviet Union (June 1941). However, their motorised and tank formations accounted for only 20% of the Heer 's capacity at their peak strength. The army's lack of trucks (and of petroleum to run them) severely limited infantry movement, especially during and after the Normandy invasion when Allied air-power devastated the French rail network north of the Loire. Panzer movements also depended on the rail, since driving a tank long distances wore out its tracks.

Equipment
Contrary to popular belief, the German Army in World War II was not a mechanised juggernaut as a whole. In 1941, between 60 and 70 percent of their forces were not motorised, relying on railroad for rapid movement and on horse-drawn transport cross country. The percentage of motorisation decreased thereafter. In 1944 approximately 85 percent of the Army was not motorised. The standard uniform used by the German Army consisted of a Feldgrau (field grey) tunic and trousers, worn with a Stahlhelm.

War crimes
Nazi propaganda had told German soldiers to wipe out what were variously called Jewish Bolshevik subhumans, the Mongol hordes, the Asiatic flood, and the red beast. While the principal perpetrators of the killings of civilians behind the front lines amongst German armed forces were the Nazi German "political" armies (the SS-Totenkopfverbände, the Waffen-SS, and the Einsatzgruppen), the army committed and ordered war crimes of its own (e.g. the Commissar Order), particularly during the invasion of Poland and later in the war against the Soviet Union.

Propaganda
The German Army was extensively promoted by Nazi propaganda.