Xiang Yu and Liu Bang originally agreed to take the east and west of the gorge (in present-day Rongxian County, Jia Luhe) as the boundary, and they did not invade each other. Later, Liu Bang followed the advice of Sean and Chen Ping, and thought that Xiang Yu should be destroyed when he was weak. Then he chased Xiang Yu's army with Han Xin, Peng Yue and Liu Jia, and chased Pengcheng (now Xuzhou, Jiangsu) eastward. Finally, several layers of troops were arranged to tightly surround Xiang Yu (in the southeast of Lingbi County, Anhui Province). At this time, Xiang Yu's soldiers were few and there was no food. In the evening, when I heard the troops around him singing the folk songs of Chu, I couldn't help but be very surprised and say, "Did Liu Bang get Chu?" Why are there so many Chu people in his army? "Say, the in the mind has lost the morale, then get out of bed and drink in the camp; Sing with his favorite concubine Yu Ji. After singing, I cried, and everyone around me was very sad, and they all felt that they could not lift their heads. After a while, Xiang Yu got on the horse, took only 800 cavalry, and escaped from the south. Run away and fight, commit suicide by Wujiang River.