August 23, 1305 - William Wallace is executed by Edward I for treason. He was hanged, beheaded, and quartered in London. Afterward his body parts were displayed in different cities as a deterrent to other would be "rebels" against the King.
August 23, 1775 - George III declared that the American colonies were in an open and declared state of rebellion.
August 23, 1914 -The Battle of Mons - the first major battle of World War I.
August 23, 1940 - The German Luftwaffe began night bombing London (the London Blitz).