may 11, 1930 - Chiang and Anti-Chiang Forces Clash

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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.

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