Second Zhili–Fengtian War
During the Second Zhili–Fengtian War a personal grievance over a friend's removal from command caused him to retreat and nearly cost his army the war. A sense that he was being under-appreciated, along with gradual encouragement by Guominjun rival Feng Yuxiang to help put Zhang's more liberal son on the Manchurian throne, led to his mutiny in mid-1925.