642: Arab forces under Amr ibn al-‘As conquer Alexandria
1683: Dutch scientist Antonie van Leeuwenhoek is the first to report the existence of bacteria
1787: The US Constitution is signed by delegates at the Philadelphia Convention
1862: Battle of Antietam [Battle of Sharpsburg], bloodiest day in the American Civil War: 22,000 dead, wounded or missing in first battle on Union soil
1916: WWI flying ace The Red Baron of the German Luftstreitkräfte, wins his first aerial combat near Cambrai, France
1940: Adolf Hitler indefinitely postpones Operation Sealion, the planned German invasion of Great Britain
1978: Anwar Sadat, Menachem Begin and Jimmy Carter sign the Camp David Accords, frameworks for peace in the Middle East and between Egypt and Israel
Source: Onthisday.com
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