第二次直奉戰爭
During the Second Zhili–Fengtian War, as the Zhili army marched on Fengtian forces, On September 27, 1924, Zheng cabled Cao Kun, the Chinese president. Beijing sent 250,000 troops with modern weaponry against Zhang Zuolin's forces in Manchuria. Zheng said "Mukden will be captured in a matter of days".