《北史·列传·卷二十九》
加之水流迅急，水手无法控制，那么，我们就会失掉这里的有利条件。 于是，隋军夜间发动进攻。
素曰： 负胜在此一举，若昼日下船，彼则见我，滩流迅激，制不由人，则吾失其便。 乃夜掩之。
Coupled with the rapid flow of water, it will cause the sailors to lose control, and then we will lose the advantage here. Therefore, the Sui army launched an attack at night.