I don't like quoting Wikipedia as a rule, but Wiki sez:


"The Bombing of Dresden by the British Royal Air Force (RAF) and United States Army Air Force (USAAF) between 13 February and 15 February 1945, twelve weeks before the surrender of the Armed Forces (Wehrmacht) of Nazi Germany, remains one of the most controversial Allied actions of the Second World War. The raids saw 1,300 heavy bombers drop over 3,900 tons of high-explosive bombs and incendiary devices in four raids, destroying 13 square miles (34 km2) of the city, the baroque capital of the German state of Saxony, and causing a firestorm that consumed the city centre. Estimates of civilian casualties vary greatly, but recent publications place the figure between 24,000 and 40,000."