The Allies carried out an aerial bombing campaign against the Axis in Belgrade during the Allied bombing of Yugoslavia in World War II. The air strikes lasted from 16 April 1944 to 6 September 1944. Belgrade was bombed eleven times by the Anglo–American air force. Infrastructure in Belgrade was bombed three times in April, twice in May, once in June and July and four times in September 1944. The heaviest casualties were recorded during the April bombing on 16 April and 17 April 1944, which coincided with the first and second days of Orthodox Easter that year. The main unit in this action was the American Fifteenth Air Force, with a base in Foggia in the south of Italy. 600 bombers took part, dropping carpet bombs from 3,000 – 5,000 metres. There was no anti-aircraft defense. Several people