The Battle of Changsha (1944), (also known as the Battle of Hengyang or Campaign of Changsha-Hengyang) was an invasion of the Chinese province of Hunan by Japanese troops near the end of the Second Sino-Japanese War. As such, it encompasses three separate conflicts: an invasion of the city of Changsha and two invasions of Hengyang. In June 1944, the Japanese deployed 360,000 troops (not including air and naval support), to attack Changsha for the fourth time (the first being in 1939). The Operation involved more Japanese troops than any other campaign in the Second Sino-Japanese war.