/kloc-The Northern Expedition, which began in 0/926, progressed smoothly with the joint efforts of the state and Qi Xin of the workers and peasants movement, and dealt a heavy blow to the rule of Beiyang warlords. However, the contradiction between China and the Kuomintang, especially the conflict between Chiang Kai-shek, China and the left-wing forces of the Kuomintang, also began to appear. 1927 After the Northern Expeditionary Army occupied Shanghai in March, Chiang Kai-shek, then commander-in-chief of the National Revolutionary Army and in control of military power, plotted to launch a coup against * * *. He used hooligans and thugs to oppose and harass the Shanghai Federation of Trade Unions, and also instructed his cronies to organize the "Shanghai Provisional Political Committee" to seize power in Shanghai. Chiang Kai-shek issued a proclamation in the name of the General Command to restrict the activities of trade unions and workers' pickets; On the other hand, he sent a banner to the workers' picket with his autograph "Struggle Together", which paralyzed the vigilance of the workers. At this point, China * * * supreme leader Chen Duxiu blindly compromise, unprepared for emergencies. Chiang Kai-shek suddenly staged a coup when his opponent was unprepared.