On 11 May, the Central Army led by Chiang Kai-shek launched a series of general offensives against Yan Xishan and Feng Yuxiang. Following the Longhai Railway, the Central Army marched westward from Xuzhou, reaching the outskirts of Kaifeng in the Henan province by 16 May. The Northwest Army, being the strongest in the anti-Chiang coalition, crushed the Central Army led by Chen Cheng in Gansu by the end of May, with Chiang having escaped from near capture.
On May 11th, Chiang Kai-shek's Central Army launched a series of offensives against Yan Xishan and Feng Yuxiang. Following the Longhai Railway, the Central Army marched westward from Xuzhou, reaching the outskirts of Kaifeng in Henan province by May 16th. The Northwest Army, being the most powerful force within the anti-Chiang coalition, defeated the Central Army led by Chen Cheng in Gansu by the end of May, with Chiang escaping a capture attempt.