Between February 13 and 15 the USAF and RAF launched a massive raid on Dresden. The British launched 722 bombers and Americans 527. Part of the ordinance was incendiary bombs that resulted in a firestorm breaking out. It destroyed 6.5 Kilometers of city and killed as many as 25,000 people. The bombing which was justified by the factories and communications centers in the city has been controversial until this day.