Operation Gomorrah was the codename for an American/British bombing of Hamburg in Germany during the last week of July 1943, causing mass destruction and mass deaths. Wikipedia states 42,600 civilians killed and 37,000 wounded, "virtually destroying most of the city".
There were also many other bombings of Hamburg during the war.
- Gomorrah: Firestorm created ‘Germany’s Nagasaki’
- Terror Bombing: The Crime of the Twentieth Century
- Life beneath the Facades of Bombed-out Streets