杨业
Emperor Taizong was aware that the failure of the East Army would affect the entire campaign and he ordered a retreat. He ordered the East Army to return, the Central Army to guard Ding Prefecture and the West Army to guard four prefectures near the border. Following the defeat of the East Army, the Liao army led by [[Yelü Xiezhen]] attacked them as they retreated. The West Army led by Pan Mei met Yelü Xiezhen's army at Dai Prefecture and faced another defeat at the hands of the Liao army. The two commanders of the West Army started to argue about retreating. Yang Ye proposed that they should retreat since the East and Central Armies had already lost the advantage following their defeats. However, the other generals on Pan Mei's side began to doubt Yang's loyalty to Song as Yang Ye used to serve [[Northern Han]]. Yang Ye led an army to face the Liao troops but they were trapped and Yang committed suicide eventually. Pan Mei was supposed to arrive with reinforcements to support Yang but he failed to do so.