《北史·列传·卷二十九》
现在应该严令全军将士不要轻举妄动，贼兵一定认为我军见形势险要不敢向前，心中轻视我军，然后乘其不备掩杀过去，可以一举平定。 
今宜勒三军勿更侵掠，贼必谓见险不前，心轻我军，然后掩其不备，可一举而平。 
Now we must order the entire army not to advance rashly, making the rebels think that our army dare not move forward because of the difficult terrain. They will look down upon us and then we can attack them by surprise and kill them, and then we can conquer them all at once.