Operation Ichi-Go
Promoted to major in 1941, Prince Mikasa served as a staff officer in the Headquarters of the China Expeditionary Army at Nanjing, China from January 1943 to January 1944. His role was intended to bolster the legitimacy of the Wang Jingwei regime and to coordinate with Japanese Army staff towards a peace initiative, but his efforts were totally undermined by the Operation Ichi-Go campaign launched by the Imperial General Headquarters.