《百战奇略·第二卷·强战》
匈奴见此情景，先是派遣小股兵力入侵，接战后李牧佯装不胜，故意丢弃几千人而退走。
匈奴来，佯败不胜，以数千人委之。
When the Huns saw this, they first sent a small force to invade. After some fighting, Li Mu pretended to be defeated and retreated on purpose, losing thousands of men.