The China Expeditionary Army (支那派遣軍, Shina hakengun) was an army group of the Imperial Japanese Army from 1939 to 1945. The China Expeditionary Army was established in September 1939 from the merger of the Central China Expeditionary Army and Japanese Northern China Area Army, and was headquartered in the pro-Japanese Reorganized National Government's capital city of Nanking. The China Expeditionary Army was responsible for all Japanese military operations in China and was the main fighting force during the Second Sino-Japanese War, with over 1 million soldiers under its command at its peak. The China Expeditionary Army was dissolved upon the Surrender of Japan in August 1945.