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During the Spring and Autumn period, the state of Qi, relying on its strength, launched an attack on the state of Lu. Duke Zhuang of Lu led his army to confront the enemy.
When the two armies met, the Qi army beat their war drums, but the Lu army, led by Cao Gui, held back and did not beat their drums. By the third time the Qi army beat their drums, their morale had significantly dropped.
It was only then that the Lu army beat their drums for the first time. The Lu army waited until the precise moment of '彼竭我盈' (when the enemy's strength was exhausted and their own was abundant) to defeat the larger Qi army with fewer troops.

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Open the tool →彼竭我盈 (bǐ jié wǒ yíng) is a Chinese idiom (chengyu) meaning “to strike when the enemy's strength or morale is exhausted and one's own is at its peak; to wait for the opportune moment when the opponent is depleted and you are strong”.
彼竭我盈 is pronounced bǐ jié wǒ yíng in Mandarin Chinese.
Literally, 彼竭我盈 means “Their resources exhausted, ours abundant”. It is used to mean “to strike when the enemy's strength or morale is exhausted and one's own is at its peak; to wait for the opportune moment when the opponent is depleted and you are strong”.
彼竭我盈 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
彼:他,对方;竭:尽;盈:充满。他们的勇气已丧失,我们的士气正旺盛。