《资治通鉴·晋纪·晋纪三十》
十一月，己卯，突然狂风大作，黄河上的冰很快封死，魏王拓跋带兵过河，留下军用物资，挑选了二万多骑兵精锐部队，火速追赶后燕部队。
十一月，己卯，暴风，冰合。魏王珪引兵济河，留辎重，选精锐二万馀骑急追之。
In November, Ji Mao, a sudden strong wind blew, and the ice on the Yellow River quickly sealed off, King Wei Tuoba led his troops across the river, left military supplies, selected more than 20,000 cavalry elite troops, and hurriedly chased the Houyan army.