Cui Xingwu was an officer in the 55th Army of Jehol province under its governor Tang Yulin. In February 1933 while commanding the 9th Cavalry Brigade at Kailu in Jehol, Cui defected to the Japanese invaders with his whole unit. Later in April with puppet forces of Liu Guitang and Li Shouxin and the Japanese 4th Cavalry Brigade Cui moved into eastern Chahar Province. His force captured several cities but was defeated and driven out of Chahar by the Chahar People's Anti-Japanese Army.