Second Zhili–Fengtian War
During the Second Zhili–Fengtian War, Feng Yuxiang changed his support from Zhili to Fengtian and forced the Beijing Coup which resulted in Cao Kun being imprisoned. Feng soon broke off from the Zhili clique again and formed Guominjun and allied himself with Duan Qirui. In 1926, Wu Peifu from the Zhili clique launched the Anti-Fengtian War. Zhang Zuolin took advantage of the situation, and entered Shanhai Pass from the Northeast and captured Beijing. The Fengtian clique remained in control of the capital until the Northern Expedition led by Chiang Kai-shek's National Revolutionary Army forced Zhang out of power in June 1928.