This Day in History: 0000-08-21
21 Aug – In the Battle of Vimeiro, British and Portuguese soldiers under Sir Arthur Wellesley (Duke of Wellington, 1769-1852) scored the first major victory against Napoleon’s French forces in the Peninsular War (1808).
21 Aug – William Seward Burroughs patented the first practical adding machine in the United States (1888).
21 Aug – Italian Vincenzo Peruggia stole the Mona Lisa from the Louvre (1911). He was finally apprehended and the painting returned two years later.