(Cao Gui) Q: "Why did you fight?" Zhuang Gong said, "I dare not enjoy the food and clothing I have for my health, but I must share it with you." Replied: "small favors can't be spread to the public, and people won't follow suit." Duke Zhuang said, "If you dare not quote more, you must be honest and trustworthy." Answer: "small honesty is not credit, and God will not bless you." Zhuang Gong said: "Even if a lawsuit (big or small) cannot be thoroughly investigated, it must be judged to be reasonable." Answer: "Loyalty (loyalty to the duties as a king) can be used to fight a war." Please let me go to war with you. "
Zhuang Gong asked him to sit in the same chariot and fight in the ladle. Zhuang Gong wanted to beat the drum and said, "No." Qi people beat the drums three times (later) and said, "You can beat the drums." Qi was defeated. Duke Zhuang is going to chase the Qi army by car. Cao Gui said, "Not yet." Get off the bus and look at the enemy's car prints. Climb the crossbar in front of the bus and look at the enemy (behind) and say, "You can pursue." So he chased the qi army.
After defeating (the enemy), Duke Zhuang asked him why. Answer: "Fighting depends on courage. Beating gongs and drums for the first time will boost morale; Beating gongs and drums again will weaken morale; When you beat gongs and drums for the third time, your morale will be exhausted. The enemy's morale is exhausted, and our morale is full, so we can defeat them. Qi is a vast and unpredictable country. I'm afraid there will be an ambush. I saw that their car prints were messy, and the flags were dragged backwards, so I chased them. "