World War II: In the second firestorm raid on Germany, the British Royal Air Force conducts an air raid on the town of Kassel, killing 10,000 and rendering 150,000 homeless.

The Kassel World War II bombings were a set of Allied strategic bombing attacks which took place from February 1942 to March 1945. In a single deadliest raid on 22–23 October 1943, 150,000 inhabitants were bombed-out, at least 6,000 people died, the vast majority of the city center was destroyed, and the fire of the most severe air raid burned for seven days. When the US First Army captured Kassel on 3 April 1945, only 50,000 inhabitants remained of its 1939 population of 236,000.