 The King of Qin, Ying Zheng, decided to finally defeat the remnants of the Chu state located in Huaiyang.According to Shiji's chapter on the great generals of the Warring States, Ying Zheng had first requested his general Wang Jian to lead the invasion, and further inquired as to the military strength needed for the siege.Wang Jian stated that he needed a force of 600,000 men for the invasion.