《资治通鉴·汉纪·汉纪五十三》
杨定、董承率军接献帝到杨奉营，夏育等出兵企图阻拦献帝，杨定、杨奉奋力作战，击败夏育等，献帝才得以逃出。
杨定、董承将兵迎天子幸杨奉营，夏育等勒兵欲止乘舆，杨定、杨奉力战，破之，乃得出。
Yang Ding and Dong Cheng led their troops to escort Emperor Xian to Yang Feng's camp. Xia Yu and the others sent troops to try and intercept Emperor Xian, but Yang Ding and Yang Feng fought hard and defeated Xia Yu and the others, and then Emperor Xian was able to escape.