- 451 Roman General Flavius Aetius defeats Attila the Hun at The Battle of the Catalaunian Plainsat (Chalons-sur-Marne), halting Hun invasion of Roman Gaul
- 622 Islamic Prophet Muhammed/Abu Bakr arrives in Jathrib (Medina)
- 1519 Spanish expedition led by Portuguese navigator Ferdinand Magellan sets off on the 1st successful circumnavigation of the globe (Magellan killed on route)
- 1854 Battle of the Alma: first major battle of Crimean War. British and French alliance defeat the Russians
- 1990 Both East and West Germany ratify reunification
- 2001 In an address to a joint session of Congress and the American people, U.S. President George W. Bush declares a "war on terror".
Maryland passes 1st anti-amalgamation law to stop intermarriage of English women & black men
On September 20, 1664