《史记·七十列传·匈奴列传》
所以在打仗时，每个人都自动地去寻求自己的利益，善于埋伏军队以突然迎击敌人。
故其战，人人自为趣利，善为诱兵以冒敌。
Therefore in battle, everyone would automatically go to seek their own interests, and would be good at ambushing troops to suddenly meet the enemy.