《新唐书·本纪·卷二·太宗》
眼下我们应先撤军几十里地，让敌寇白天看到我军旗，夜间听见我军指挥进退的钲鼓声，以为援军大批涌至，即可不攻打而让它跑掉。
今宜先后吾军为数十里，使其昼见旌旗，夜闻钲鼓，以为大至，则可不击而走之。
Right now, we should retreat for dozens of miles first, let the enemy see our military flag in the day time, and hear the military drum and gong of us to command the advance and retreat at night, they would think there are a lot of reinforcements, then they would leave without attacking.