《宋书·列传·卷五十》
垣护之听说，魏兵已把王玄谟的水兵大船全部用铁链连住，布成三道，截断黄河，想堵住垣护之的退路。
护之闻知，而虏悉已牵玄谟水军大艚，连以铁锁三重断河，欲以绝护之还路。
Yuan Huizhi heard that the Wei soldiers had connected all of Wang Xuanmo's large warships with iron chains and set up three lines to block the Yellow River in order to block Yuan Huizhi's retreat.