《宋史·列传·卷十七》
契丹大军当前，当时正炎热天气，军士困乏，粮草将尽，曹彬退兵，军队不再有阵势，于是被敌人追击战败。
契丹大众当前，时方炎暑，军士乏困，粮且尽，彬退军，无复行伍，遂为所蹑而败。
The enemy's formidable army was close at hand, and as the weather was hot, the soldiers were exhausted, and their provisions were running out, Cao Bin retreated. With their formation broken, the soldiers were pursued and defeated by the enemy.