《北史·列传·卷六十七》
当时，乙支文德见宇文述军中士卒多有饥饿之色，想让宇文述之军疲惫，每次战斗都假作失败。
时文德见述军中多饥色，欲疲述众，每斗便北。
When Yizhi Wende saw that many of the soldiers in Yuwen Shu's army were hungry, he wanted to exhaust Yuwen Shu's army, so he pretended to be defeated every time they fought.