At the end of the Eastern Han Dynasty, Liu Bei, a descendant of the royal family, was born in Bu. Later, the Yellow turban insurrectionary gained the official position by the meritorious military service, but it was deposed by Du You. Later, he took Guan Yu and Zhang Fei to Gongsun Zan, but they were not reused by Gongsun Zan. Then he went to Xuzhou, went to Tao Qian, and finally got Xuzhou. However, Xuzhou, which Liu Bei finally got, was cheated and lost by Lu Bu.

In desperation, Liu Bei had to go to Cao Cao, and the two seemed to hit it off, and they also boiled wine to talk about heroes. But Liu Bei has his own ideas. When Yuan Shu proclaimed himself emperor, Liu Bei put forward a crusade and slipped away from Cao Cao. After defeating Yuan Shu, Liu Bei defected to Liu Biao in Jingzhou. Knowing that Cao Cao would not let himself go, Liu Bei repeatedly advised Liu Biao to send troops to attack Cao Cao, but Liu Biao refused.

After Liu Biao's death, his son Liu Cong even ignored Liu Bei. When Cao Cao's army attacked, Liu Cong surrendered directly. Liu Bei abandoned his wife and children in panic and ran for his life. Zhao Yun didn't protect Liu Bei to save Adou. Liu Bei also suspected Zhao Yun's rebellion and surrendered to Cao Cao. In order to prevent any change, he sent Zhang Fei to patrol the rear.

Zhang Fei, with few troops, came to Dangyang Bridge and saw Zhao Yun escape from the encirclement of Jun. Zhang Fei himself had to fend off hundreds of thousands of Cao Jun. At that time, there were less than 50 people under Zhang Fei. It is said that he let 20 people stir up dust with branches behind him, making it look like an ambush. Facing Cao Cao's personal attack, Zhang Fei stood on Dangyang Bridge and shouted, "I am Yan Zhang Yide! Who dares to die with me! "

Zhang Fei led a team that could not be compared with Cao Jun to defend Liu Bei. Cao Cao is a shoo-in. Besides, he is about 100 meters away from Zhang Fei, and Zhang Fei and his military forces can be razed to the ground without direct attack. But in the end, Cao Cao's generals, Chu Xu, Xiahou Chun and Zhang Liao, were afraid to play, and it was not without reason.

First, Guan Yu's embellishment and Zhang Fei's personal courage and resourcefulness. Before Guan Yu surrendered to Cao Cao, Cao Cao once asked Guan Yu who was a hero. At that time, Guan Yu told Cao Cao that his third brother, Zhang Fei, was an easy thing to take the lead among the generals. When Cao Cao saw Zhang Fei alone at Dangyang Bridge, he told his men about Zhang Fei's strength and told them to be more careful.

First of all, from this point of view, he gave his subordinates a wrong position and thought that Zhang Fei was a very powerful hero. At this time, his people have been afraid of Zhang Fei from the bottom of their hearts. Zhang Fei once played against Ma Chao and played against Lu Bu dozens of times, and the outcome was not divided. Chu Xu, the general of Cao Cao, also played against Lu Bu, and eight generals of Cao Cao besieged Lu Bu. Although he didn't win, from the situation at that time, Chu Xu was at a disadvantage.

As Chu Xu, who has experienced this incident, he certainly dare not make a move. Xiahou Chun, Zhang Liao and others are also worried about Zhang Fei's bravery. Besides, Zhang Fei is a crude and refined person. He could think of letting his men stir up the dust with branches, creating the illusion of an ambush and facing Cao Cao's army with great momentum. This also shows that Zhang Fei is resourceful.

Second, the selfishness of Chu Xu, Xiahou Chun and Zhang Liao. Chu Xu: They all know that Zhang Fei has a good reputation. He has played against Ma Chao and Lu Bu, and his strength is to be reckoned with. Besides, in front of Cao Cao, they also dare not rashly. If they are defeated by Zhang Fei, it will make Cao Cao look down on himself, so no one dares to take the risk. Because less loses more, who will want to do it?

Third, Cao Cao himself has reservations. Cao Cao's delicate mind has long seen through people's minds, but Cao Cao didn't force people to go, because Cao Cao has chased Liu Bei like a lost dog. As a winner, he doesn't need to take any more risks. Besides, Cao Cao was suspicious by nature, and naturally he was afraid of an ambush behind Zhang Fei. It is not worth the loss to lose several good men for a Zhang Fei. So choose the wisest way to retreat directly. Cao Cao said nothing, and Chu Xu, Xiahou Chun, Zhang Liao and others certainly didn't need to be early birds.

When the Yangqiao Bridge was broken, Zhang Fei responded to Cao Jun's plan, supported his fearlessness and courage, and was praised by Guan Yu. It has made people hide, what's more, it is even more aggressive to meet Zhang Fei himself, so it is hard not to make people afraid of him. And Zhang Fei made a move, which made Cao Jun have the illusion that there was an ambush behind him. In addition, General Cao Jun is attached to his existing power position, and he doesn't want to lose Cao Cao's trust and esteem for himself because of a Zhang Fei. Naturally, he dare not sell himself short.

To put it bluntly, who would sacrifice their glory for an unnecessary war? Finally, there is no need for Cao Cao's own series of inner drama to sacrifice his good men for an unnecessary war. Cao Cao himself was afraid of an ambush. After all, there is nothing wrong with being careful, and evacuation is also the best choice. So whether because of Zhang Fei's personal factors or starting from Chu Xu, Xiahou Chun, Zhang Liao and Cao Cao, Chu Xu, Xiahou Chun and Zhang Liao dare not fight, and there is no need to fight.