The Bombing of Wewak was a series of air raids by the USAAF Fifth Air Force, on 17–21 August 1943, against the major air base of the Imperial Japanese Army Air Force on the mainland of New Guinea, at Wewak. The four raids, over a five-day period, represented a decisive victory for the Allies: the Japanese Fourth Air Army lost about 100 planes on the ground and in the air, reducing its operational strength to about 30 planes. Ten aircraft from the U.S. Fifth Air Force were lost.