On June 28, 1944, Japanese aircraft arrived over the Salween Front for the first time in the campaign to resupply their besieged troops as Songshan. The Japanese Army Air Force had been preoccupied by the Allied offensive in Burma and the Ichi-go Campaign in central China. By late June, however, the supply situation of the garrison at Songshan was becoming increasingly desperate. Six Ki-43 Oscars escorted four Ki-36 Idas which dropped bamboo containers filled with bullets and grenades. Unlike the Americans, the Japanese did not have a lot of experience with air drops. They made hasty drops to avoid anti-aircraft artillery and the threat of interception. Most of the supplies fell into Allied hands.