may 4, 1926 - Ungern Seized Inner Mongolia

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Ungern seizes Guominjun held Inner Mongolia. Guominjun troops tried to flee through Shanxi, but the Shanxi clique led by Yan Xishan maintained a very strict neutrality policy and attacked any soldiers that encroached their borders. Yan, an ex-Tongmenghui member, was sympathetic with the Guominjun but did not want his province drawn into civil war. Guominjun armies are defeated in North China, remnants of which are incorporated by the Shanxi Clique, the remainder of Feng's forces retreated to Zhangjiakou where his army became known as the Northwest Army.

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