Hong Chengchou
On 20 August 1641, the Ming army attacked the Qing camp. The battle lasted the whole day, and the result was too close to call. However, Prince Ajige unexpectedly captured the Ming army's provisions in Bijia Mountain, significantly undermining their ability to fight. The battle continued on 21 August, and was unfavourable to the Ming army. After this defeat Datong full general Wang Pu lost the will to fight. Before Hong Chengchou issued orders, Wang fled with his troops, which completely disrupted the original breakthrough plan. More surprisingly, Wu Sangui also fled in the chaos, escaping on Wang's heel. At such a life-or-death moment, Wu revealed selfishness.