On August 18, Chen Cheng reached the front lines to discuss the situation with Zhang Zhizhong. They decided to send the newly arrived 36th Division into the fray, attacking the Hueishan (匯山) docks on the northern side of the Huangpu River. Meanwhile, the 87th Division broke through Japanese lines at Yangshupu, and pushed onto the Hueishan docks along with the 36th Division. On August 22, the tanks of the 36th Division reached the docks, but were unable to hold the position for long. The Chinese troops were insufficiently trained in coordinating infantry-tank tactics, and the troops were unable to keep up with the tanks. Without sufficient infantry to protect them, the tanks were vulnerable to Japanese anti-tank weapons and artillery in close quarters and became useless when they entered the city center. The few troops who did manage to keep up with the tanks through the city blocks were then trapped by Japanese blockades and annihilated by flamethrowers and intense machine gun fire. While the Chinese almost succeeded in pushing the Japanese down the Huangpu River, the casualty rate was exceedingly high. During the night of August 22 alone, the 36th Division lost more than ninety officers and a thousand troops. 36th staff officer Xiong Xinmin saw a Chinese suicide bomber stop a Japanese tank column by exploding himself beneath the lead tank.