《资治通鉴·晋纪·晋纪二十七》
后秦王姚苌率领七万兵众攻打前秦，前秦王苻坚派杨壁等人抵抗，被姚苌打败。擒获了杨壁以及右将军徐成、镇军将军毛盛等将帅官吏数十人，姚苌对他们全都以礼相待，然后放他们回去了。
后秦王苌帅众七万击秦，秦王坚遣杨璧等拒之，为苌所败；获杨璧及右将军徐成、镇军将军毛盛等将吏数十人，苌皆礼而遣之。
Yao Chang, King of Later Qin, led a force of seventy thousand to attack Former Qin. Fu Jian, King of Former Qin, sent Yang Bi and others to resist, but they were defeated by Yao Chang. Yang Bi and dozens of generals and officials, including the Right General Xu Cheng and the Commander of the Garrison Troops Mao Sheng, were captured. Yao Chang treated them all with courtesy and then released them.