1268: The Crusader city of Antioch fell to the Mamluk sultan Baybars, who razed it to the ground and killed or enslaved its inhabitants.
1969: The Apollo 10 space mission is launched from Cape Kennedy. In a dry run for the lunar landings two months later, astronauts Thomas Stafford and Eugene Cernan will approach to within nine miles of the moon’s surface.
1412: Henry IV and a group of French lords led by the Duke of Orleans signed the Treaty of Bourges. In exchange for the acceptance of his sovereignty over the Duchy of Aquitaine, Henry agreed to aid Orleanists against the Burgundians, and sent an army to France under the command of his son, the Duke of Clarence. But when a temporary peace was made with the Burgundians, Clarence was left isolated in Normandy. He responded by leading his army on a raid on English-held Bordeaux.
1803: The temporary cessation of hostilities between Britain and revolutionary France came to an end when Britain revoked the Peace of Amiens and declared war on France.
1980: A major volcanic eruption of Mount St Helens in Washington State caused the deaths of 57 people and completely destroyed more than 200 square miles of forest.