After the Long March, the Chinese Communists were mostly in northern Shaanxi, wanting a breather. 

Japan had continued its aggression in China after it set up the puppet state of Manchukuo under Emperor Pu Yi. It manufactured incident after incident and had expanded its army’s reach into northern and northeast China. It was trying to influence Inner Mongolia and Hebei, around Beijing. It looked to set up warlords as puppet leaders under Japanese control.

Students and intellectuals in Beijing and other Chinese cities began protesting against the Japanese and against politicians that they perceived as being too friendly to Japan. It was a reminder of earlier demonstrations against Japan like the May Fourth movement of 1919. 

The Communist Party and Comintern supported these student protests against Japan. The Soviet Union was very concerned by Japan’s aggression and the fact that Nazi Germany and Imperial Japan had signed an anti-Comintern pact in late 1936. Stalin wanted either an anti-Japanese China, or alternatively, a Communist controlled buffer state between it and Japan. 

Chiang Kai-shek and his KMT government in Nanjing was prioritizing pacifying internal enemies before resisting foreign aggression. Chiang was not against resisting Japan. He had done so when Japan had attacked Shanghai and at other times, but Chiang Kai-shek's strategy was clear-cut. First, eliminate the internal threat posed by the Chinese Communists, then turn attention towards the aggressive expansion of Japan.

His subordinates, especially Generals Zhang Xueliang and Yang Hucheng had other ideas.  

They then kidnapped Chiang Kai shek and placed him under house arrest in Xi'an. Negotiations ensued. Madame Chiang Kai Shek and Zhou Enlai both travelled to Xi'an. Eventually Chiang was released and Zhang Xueliang volunteered to travel with him back to Nanjing.

Zhang was then put under house arrest for 5 decades.

This ended the encirclement of the Chinese Communists and started the Second United Front. This time, they would focus on resisting Japanese expansion into China. But Japan was furious by this development and the Xian Incident helped cause the Second Sino-Japanese War.

Image: "1937 China Nanking Chiang Kai-Shek" by manhhai is licensed under CC BY 2.0.  

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