《资治通鉴·晋纪·晋纪二十九》
而前秦国主苻登又在陇东进攻后秦天水太守张业生，姚苌赶去解救他，苻登率兵退去。
秦主登攻后秦天水太守张业生于陇东，苌救之，登引去。
Then the ruler of the Former Qin, Fu Deng, attacked the Prefect of Tianshui in the Later Qin, Zhang Yusheng, in Longdong, and Yao Chang rushed to rescue him. Fu Deng's army then retreated.