In September 12, 1945, the Eleven Japanese Division and Fourth Manchurian Division of the Japanese Armed Forces entered Hohhot, Inner Mongolia. The commander of Chinese Army in Inner Mongolia, General Chen Xuogun officially surrendered to the commander of Japanese Army in Kalgan, General Chiba Ketsuzo in September 19, 1945. The Interim Executive Committee of the Inner Mongolia formed in September 25, 1945 and headed by Nayaan Tuunamiir.