May 11

• May 11, 1189
  Emperor Frederik I Barbarossa and a massive expedition of 100,000 crusaders, including 20,000 knights, depart Regensburg for the Third Crusade
• May 11, 1421
  Possessions of Jews are confiscated in Austria, Jews are expelled
• May 11, 1573
  Polish Parliament selects Henry, duke of Anjou, as king who becomes the first elected king of Poland
• May 11, 1689
  French defeat English in naval battle at Bantry Bay
• May 11, 1745
  French forces defeated an Anglo-Dutch-Hanoverian army at Fontenoy
• May 11, 1784
  England and Tipu Sultan sign peace treaty bringing an end to the Second Anglo-Mysore War
• May 11, 1792
  Columbia River discovered and named by US Captain Robert Gray
• May 11, 1812
  The Waltz is introduced into English ballrooms, but most observers consider it disgusting and immoral
• May 11, 1857
  Sepoys seize Delhi during the Indian Mutiny against British Empire, triggered by the ammunition for the Enfield Rifle, used paper cartridges containing tallow derived from beef, which would be offensive to Hindus
• May 11, 1858
  Minnesota becomes the 32nd state admitted into the Union
• May 11, 1860
  Giuseppe Garibaldi, Italian general, lands at Marsala, Sicily starting series of campaigns that politically unified most of the Italian peninsula, known as the Expedition of the Thousand
• May 11, 1867
  Treaty of London is drawn, guarantees the neutrality of Luxembourg
• May 11, 1928
  General Electric opens first TV-station in Schenectady New York
• May 11, 1931
  The Creditanstalt, Austria's largest bank, goes bankrupt, beginning the banking collapse in Central Europe that causes a worldwide financial meltdown
• May 11, 1939
  The Japanese army attacks Outer Mongolia at Nomonhan, starting Battles of Khalkhin Gol against Soviet Union
• May 11, 1940
  Nazis start invasion in the Netherlands and Belgium with attack of Belgian Fort Eben Emael
• May 11, 1951
  Jay Forrester, an American computer engineer, patents computer magnetic-core memory, used tiny magnetic toroids, the cores, through which wires are threaded to write and read information
• May 11, 1968
  Students and police battle in Paris, France, hundreds injured starting May 1968 events in France
• May 11, 1997
  IBM's Deep Blue chess computer defeats Garry Kasparov in the last game of the six-game series, the first time a computer beat a chess World Champion in a match
• May 11, 1998
  India conducts three underground nuclear tests in Pokhran, including one thermonuclear device, as an answer to Pakistan tests medium-range missiles
• May 11, 2002
  Ray Charles with other musicians takes part in a peace concert in Rome, organized in partnership with the Glocal Forum and the Quincy Jones Listen Up Foundation, which is the first event to take place inside the city's ancient Colosseum since 404 A.D
• May 11, 2010
  Queen Elizabeth II asks Britain's Conservative leader David Cameron to form a new government and he accepts to form a coalition with the Liberal Democrats