[Explanation]: flag: flag; Easy: Change. The metaphor overthrows others and takes possession of oneself.

【Idiom Story】:

After Han Xin was worshiped by Liu Bang as a general, he led the Han army to capture Wei and Dai, and then, with the assistance of Zhang Er, led tens of thousands of troops east to Jingcheng to attack Zhao. King Zhao and the main general Chen Yu gathered 200,000 troops at Jingchengkou to block it.

The strategist Li Zuojun suggested that Chen Yu give him 30,000 troops, set off from the small road, and unexpectedly intercept the logistics equipment and food of the Han army; And its former army did not engage in battle when it arrived at Jingcheng. In this way, the heads of Han Xin and Zhang Er can be removed in less than ten days.

Chen Yu was a scholar who did not like to use tricks and tricks, believing that Han Xin's soldiers were only a few thousand, and after a thousand miles of marching, he was very tired and could attack him directly, so he did not adopt Li Zuojun's strategy.

When Han Xin's men heard the news, they were very happy, and they were relieved to go east to Jingcheng and march to a place thirty miles away from the mouth of Jingcheng, and Han Xin ordered to rest. In the middle of the night, he selected 2,000 light cavalry, and asked them to carry a red banner each, and went down the trail to hide behind the Jingchengkou Mountain, and said to them: "I will send another army to confront the Zhao army, and pretend to be defeated." In this way, the Zhao army will definitely come out of the nest and come to pursue. You take this opportunity to quickly enter the Zhao camp, pull out the banner of the Zhao army, and replace it with the red banner of our Han army. ”

Then, Han Xin sent an army of 10,000 men and told them to set up a position on their backs. When Zhao Jun saw that the Han army discharged the most taboo backwater formation in the art of war, they all laughed, thinking that the Han army had cut off the back road.

As soon as dawn, Han Xin commanded an army of 10,000 people to march towards the Jingcheng Pass, and the Zhao army immediately opened the camp gate to meet the attack. After fighting for a while, Han Xin and Zhang Er ordered the Han soldiers to abandon their strength and retreat to the water's edge. The Han soldiers retreated to the waterside position, and could no longer retreat, so they had to fight desperately.

At this time, the 2,000 Han soldiers hidden behind the mountain, taking advantage of the fact that the Zhao camp was unguarded, quickly rushed into the Zhao camp, quickly pulled out the banner of the Zhao army, and replaced it with the red banner of the Han army. The Zhao soldiers, who were fighting by the water, could not win because of the stubborn resistance of the Han soldiers who fought against the water, and wanted to return to the camp, but they saw that there were all the red flags of the Han army, thinking that the king of Zhao had been captured by the Han soldiers. Then, the Han army attacked the Zhao army on both sides, and as a result, the main general Chen Yu was killed and the king of Zhao was captured alive.

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