1515 – Battle at Marignano ends in French/Venetian victory
1807 – Aaron Burr acquitted of a misdemeanor charge
1862 – Battle at South Mountain: Union troops defeat an outnumbered Confederate force
1882 – British General Wolseley reaches Cairo
1911 – Russian Prime Minister Peter Stolypin is assassinated in Kiev; his regime has been characterized by harsh measures to control dissidents
1939 – British fleet attacks German U-39 boat
1950 – Western allies rearm West Germany
1981 – Entertainment Tonight premieres on TV
2009 – David Attenborough and Prince William officially open the Darwin Centre at the National History Museum London, in what is the Museum’s most significant expansion since 1881
2011 – Elizabeth Warren announces she intends to run for the Democratic nomination for the 2012 Massachusetts Senatorial election