Wikipedia:Selected anniversaries/August 21

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 * 1689 – Jacobite risings: Jacobite clans clashed with a regiment of Covenanters in the streets of Dunkeld, Scotland.
 * 1717 – Austro-Turkish War: Austrian troops under the command of Prince Eugene of Savoy captured the strategically important city of Belgrade from the Ottoman Empire.
 * 1789 – The national colours of Italy first appeared on a tricolour cockade in Genoa.
 * 1808 – Peninsular War: British–Portuguese forces put an end to the first French invasion of Portugal at the Battle of Vimeiro.
 * 1858 – The first of seven debates between Abraham Lincoln and Stephen A. Douglas (both pictured), candidates for an Illinois seat in the U.S. Senate, was held in Ottawa, Illinois.
 * 1911 – Leonardo da Vinci's Mona Lisa (pictured) was stolen from the Louvre by museum employee Vincenzo Peruggia and was not recovered until two years later.
 * 1942 – World War II: The Imperial Japanese Army lost the Battle of the Tenaru, the first of its three major land offensives during the Guadalcanal Campaign.
 * 1944 – World War II: A combined Canadian–Polish force captured the town of Falaise, France, in the final offensive of the Battle of Normandy.
 * 1963 – South Vietnamese special forces loyal to Ngô Đình Nhu, the brother of President Ngô Đình Diệm, raided and vandalised Buddhist pagodas across the country, arresting thousands and leaving hundreds dead.
 * 2015 – Passengers on a Thalys train from Amsterdam to Paris confronted and subdued an attacker who attempted a mass shooting.
 * Born/died this day: | Baldwin II of Jerusalem |d|1131| Alphonse, Count of Poitiers |d|1271 John Claypole |b|1625| Lady Mary Wortley Montagu |d|1762| John MacCulloch |d|1835| Christopher Robin Milne |b|1920| Thomas S. Monson |b|1927| Art Farmer |b|1928| Stephen Hillenburg |b|1961| Sergey Brin |b|1973| Eve Torres |b|1984