 Just one month later, however, Sun was appointed "high military advisor" for the Military Affairs Commission's Beiping branch by the central government.In 1937, when the Second Sino-Japanese War erupted, Sun resurfaced once again, commanding troops against the Japanese, taking command of the Hebei-Chahar Guerillas in 1938.He was eventually appointed as general of the NRA's 5th Army, but alongside his superior Pang Bingxun defected to the Japanese in 1943.