《资治通鉴·晋纪·晋纪三十四》
后秦国主姚兴带领军卒四万七千人前去救援姚平，准备占据汾水以西的天渡，从这里运送粮食接济坚守柴壁的姚平部队。
秦王兴将兵四万七千救之，将据天渡运粮以馈平。
Yao Xing, the supreme chief of Later Qin, led 47,000 soldiers to rescue Yao Ping, and prepared to occupy Tiandu on the west side of Fen Shui, to transport food and supplies from there to help the troops of Yao Ping who were holding on in Chaibi Fort.