On April 12, 1927, Chiang Kai-shek launched the April 12 Counter-Revolutionary Coup in Shanghai, carrying out a brutal massacre of Communist Party members and revolutionary masses, which led to the collapse of the First United Front between the Kuomintang and the Communists. In response, the Communist Party led the Tingpang Uprising, marking the beginning of a large-scale revolutionary movement in eastern Zhejiang. It was soon besieged by the Nationalist provincial defense forces, and Bao Ding led the crowd in a fierce battle against the enemy at Hulongtou.