 The first Qin invasion was a disaster when the 200,000 Qin troops were defeated by 500,000 Chu troops in the unfamiliar territory of Huaiyang (modern-day northern Jiangsu and Anhui provinces).Ying Zheng recalled Wang Jian, who finally agreed to lead the second invasion force after being allocated the force of 600,000 men that he had earlier requested.In 224 BC, Wang Jian began the second invasion by Qin forces of Chu.