人人自为战 Everyone fights for themselves
Explanation
人人自为战，指每个士兵都能独立作战，不依赖他人。
Everyone fights for themselves, meaning that every soldier can fight independently without relying on others.
Origin Story
楚汉相争时期，韩信率领汉军十万征讨赵国。赵军在井陉口设下埋伏，两军狭路相逢，形势对汉军十分不利。然而，韩信早已料到此点，他采取了‘背水一战’的策略，将汉军置于绝境。汉军将士们背水而战，人人自为战，个个奋勇杀敌，最终大败赵军，取得了井陉之战的伟大胜利。
During the Chu-Han contention, Han Xin led 100,000 Han troops to attack the Kingdom of Zhao. The Zhao army laid an ambush at the Jingxing Pass, and the two armies met on a narrow road, putting Han Xin's army in a very disadvantageous situation. However, Han Xin had foreseen this, and he adopted the strategy of "fighting with their backs to the water." Placing his troops in a desperate situation, the Han soldiers fought valiantly, and everyone fought for themselves. They eventually defeated the Zhao army, achieving a great victory in the Battle of Jingxing.
Usage
用于形容在危急关头，个人独立战斗的情况。
Used to describe the situation where individuals fight independently in a critical juncture.
Examples
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面对强敌，我军将士人人自为战，英勇奋战，最终取得了胜利。
miàn duì qiángdí, wǒ jūn jiàngshì rénrén zì wéi zhàn, yīngyǒng fènzhàn, zuìzhōng qǔdé le shènglì
Faced with a strong enemy, our soldiers fought bravely on their own, and finally won the victory.
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在这次危机中，每个人都必须人人自为战，才能渡过难关。
zài zhè cì wēijī zhōng, měi gè rén dōu bìxū rénrén zì wéi zhàn, cáinéng dù guò nánguān
In this crisis, everyone must fight for themselves in order to overcome the difficulties.
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面对困境，团队成员们人人自为战，各尽所能，最终完成了任务。
miàn duì kùnjìng, tuánduì chéngyuán men rénrén zì wéi zhàn, gè jìn suǒ néng, zuìzhōng wánchéng le rènwu
In the face of difficulties, the team members fought independently, doing their best, and finally completed the task.