After a six-week siege the Chinese city of Hengyang fell to the Japanese on August 8, 1944. That morning, eight P-40s of the 75th Fighter Squadron (FS), led by Maj. Donald Quigley, encountered nine Ki-43s of the 48th Sentai at low altitude near Hengshan during a strafing mission. Following a brief action, the 75th FS returned to base and claimed one victory, two probables and four damaged. However, the 48th Sentai had actually lost three Ki-43s, while the sentai commander, Maj. Masao Matsuo, was wounded. No P-40s were lost, although the 48th Sentai pilots claimed seven victories.