Burn one's bridges: In the second year of Qin Ershi, Zhao was besieged by Qin in Julu City, and the prince of Zhao turned to Chu Huaiwang and other governors for help. The following year, the king of Chu sent Xiang Yu to lead tens of thousands of Chu troops north to solve the plight of Julu.

On the sidelines: Chu troops are all brave and good at fighting, and their power is overwhelming the princes. There are more than ten vassal barracks to rescue the giant deer, but no one dares to send troops to attack.

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If the cavalry throws the whip into the river