World War II: One thousand British bombers launch a 90-minute attack on Cologne, Germany.

Bombing of Cologne in World War II

The German city of Cologne was bombed in 262 separate air raids by the Allies during World War II, all by the Royal Air Force (RAF). A total of 34,711 long tons (35,268 t) of bombs were dropped on the city causing 20,000 civilian casualties.