People from the countryside, with their extraordinary wisdom, helped the weak state of Lu defeat the powerful state of Qi. It left a profound insight for future generations, that is, "gather, then decline, and finally exhaust." Cao Gui explained it this way: "Fighting depends on courage. The first drum encouraged courage, the second drum suppressed courage, and the third drum dried up. Their courage disappeared, and our army's courage became stronger, so it was defeated!

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