In the first year of Xingping (194), Cao Cao sent troops to attack Xuzhou again, when Zhang Miao was left by Chen to guard the Tai, and Chen Gong was left to guard the East County, both of them took the opportunity to betray Cao Cao, Zhang Miao and his younger brother Zhang Chao and Chen Gong and others greeted Lu Bu and asked him to be the pastor of Yanzhou and occupy Puyang.

At that time, Zhang Miao and Zhang Chao were very prestigious, Lu Bu had the merit of killing Dong, and Cao Cao had basically offended the Shi clan gate lords in Yanzhou, so the counties and counties to which Yanzhou belonged responded to Lu Bu's betrayal of Cao Cao.

At that time, only Juancheng (now north of Juancheng, Shandong, Yanzhou Zhishuo) and Fan (now southeast of Fanxian County, Shandong) and Dong'e (northeast of Yanggu, Shandong) were still under Cao Cao's control, and they were respectively held by Sima Xunyu and Shou Zhang Ling Cheng Yu, and Dongjun Taishou Xiahoudun, and the situation was extremely critical.

At first, Zhang Miao and Chen Gong took the opportunity to oppose Cao in Yanzhou and secretly greeted Lu Bu. At that time, Xun Yu and Shou Zhang ordered Cheng Yu to guard Juancheng, and after Lü Bu arrived, Zhang Miao sent Liu Yi to tell Xun Yu: "General Lü came to help Cao Envoy Jun attack Tao Qian, and he should immediately supply them with armaments and food." ”

Everyone was puzzled, but Xun Yu knew his plan, and immediately ordered the army to strengthen the defense, and urgently summoned the Taishou Xiahoudun of Dongjun. And all the cities of Yanzhou responded to Zhang Miao and took refuge in Lu Bu's camp. At that time, Cao Cao led a large army to the expedition, and the troops left behind were not many, and some of them were taken away by Chen Gong, and many people colluded with Zhang Miao and Chen Gong. After Xiahou arrived, he killed dozens of rebels by night, which calmed the morale of the army.

When Cao Cao conquered Tao Qian, he initially left Xiahou to guard Puyang, an important town in Yanzhou. However, after Zhang Miao and Chen Gong betrayed and welcomed Lü Bu, because Cao Cao's family was in Juancheng, Xun Yu knew that after Lü Bu entered Yanzhou, Xiahou led the army to Juancheng, and encountered Lü Bu on the way, and the two armies fought.

Lü Bu took the opportunity to seize Puyang, and then attacked to get Xiahoudun's baggage, and sent generals to pretend to surrender and capture Xiahoudun alive, which shook Xiahoudun's army for a while. However, Han Hao, Xiahoudun's right-hand man, guarded the gate of the camp and gathered all the generals together, asking them to calm his soldiers and not act rashly, and Xiahoudun's army slowly stabilized.

Han Hao arrived at Xiahoudun's residence and angrily reprimanded Xiahoudun's captors and said, "You murderous rebels, you dare to take the general hostage, don't you want to live?" And I'm on a mission to defeat traitors, will I let you do whatever you want because of a great general? He cried and said to Xiahoudun: "The law of the country is like this, I have to do this!" Immediately gather soldiers to attack the hijackers. The kidnappers were so frightened that they prostrated their heads and said, "We only ask for our passage money, so let's go back!" Han Hao denounced the kidnappers' actions and killed them all. At the same time, he also rescued Xiahoudun.

Later, Cao Cao learned about this and said to Han Hao: "Your practice can be used as the law of eternity." So he issued an order that in the future, if there was a hostage-taker, he should destroy the hostages together, and that the hostages should not be taken without any scruples, and that the hostage-taking would never happen again.

At that time, Guo Gong, the assassin of Yuzhou, was instigated by Lu Bu and led tens of thousands of troops to attack Juancheng, and the army was very afraid. Guo Gong asked to see Xun Yu, Xun Yu was about to go, Xiahoudun and others said: "You are the barrier of a state, if you go, it will definitely be dangerous, you can't go." ”

Xun Yu said: "Guo Gong and Zhang Miao have no dealings with each other, and now they are in a hurry, and the plan must not have been decided; Lobbying him now while he is still undecided, if not to help us, can keep him neutral, and if he doubts first, he will be angry and make up his mind. So he went out of the city to meet Guo Gong, Guo Gong saw that Xun Yu was not afraid, and thought that Juancheng was easy to defend and difficult to attack, so he led his troops away.

After Xun Yu retreated from Guo Gong, the surrenderers in Lu Bu's army said that Chen Gong was going to personally lead his troops to capture Dong'e, and also asked Bianwei to capture Fan County, and the officials and people couldn't help but panic. At this time, Xun Yu said to Cheng Yu: "Now that Yanzhou is in rebellion, there are only these three cities. Chen Gong and others forced the city with heavy troops, if it weren't for someone to go deep into it and unite as one, the three cities would also change. You are the hope of the people, and if we can go back to the city and persuade them, we can still succeed! ”

Cheng Yu then returned, passed by Fan County, and persuaded the county commander Jin Yun to say: "I heard that Lu Bu has arrested your mother, younger brother, wife, and children, which is absolutely intolerable to filial sons!" Now that there is a great chaos and heroes are rising, there will definitely be people who have the talent to kill the world and have the ability to quell the chaos in the world, which requires a wise man to make a prudent choice. Those who have the Lord's Wisdom will prosper, and those who have lost the Lord's Sight will perish. Chen Gong rebelled and greeted Lu Bu, and all the cities responded, as if they could do something. However, in your opinion, what kind of person is Lu Bu! That Lu Bu was rude and denied by his six relatives, rigid and rude, but he was just a puppet hero. Chen Gong and others cooperate with snobbery and can't help you. Although they have many soldiers, they will not succeed in the end. Cao Yuanjun's outstanding wisdom is rare in the world, and it can almost be said that it is bestowed by God. You will definitely be able to hold on to Fancheng, and I will defend Dong'a, so that the credit for recovering lost territory like Tiandan can be established. Who would disobey the wicked and cause the death of both parents? I hope you've thought about it carefully! ”

Jin Yun said with tears in his eyes: "I don't dare to have other thoughts." At this time, Bi Wei was already in the county, so Jin Yun summoned Bi Wei, ambushed the soldiers to assassinate him, and went back to restrain the soldiers to defend the city. Cheng Yu sent cavalry to block the Cangtingjin ferry, and Chen Gong came and was not allowed to cross the river.

Cheng Yu arrived in Dong'e, and Dong'e County Ling Zaoyi had already led the officials and people to stick to the city. There was also Yanzhou engaged in the joint planning of Xue Yi and Cheng Yu, and finally preserved the three cities and was able to wait for Cao Cao's return.

After Zhang Miao, Zhang Chao, and Chen Gong betrayed, and Lu Bu entered Yanzhou, even if Xun Yu, Cheng Yu and others kept Juancheng and other places, Cao Cao still fell into an extremely passive situation.

At that time, many of Cao Cao's subordinates carried him, including Xu Xi, Mao Hui and others, among which the more famous ones were Bi Chen and Wei Chong.

After Cao Cao became the pastor of Yanzhou, he appointed Bi Chen, a native of Dongping, as a separate driver, and after the Yanzhou Rebellion, Zhang Miao robbed Bi Chen's mother, younger brother, wife and children, Cao Cao dismissed Bi Chen and said to him: "Your old mother is a traitor, you can also leave me." But Bi Chen knelt down and kowtowed to Cao Cao, saying that he would never have two hearts because of this, and Cao Cao was moved to tears and praised him very much.

But then Bi Chen left Cao Cao and joined Zhang Miao.

And Wei Chong has always been very admired by Cao Cao, and Cao Cao even personally promoted him as filial piety. After Lü Bu entered Yanzhou, many of Cao Cao's subordinates turned away, but Cao Cao said to everyone: "Only Wei Chong will not rebel against me." ”

As a result, Wei Chong also turned away from Cao Cao, and Cao Cao was furious when he found out: "As long as you Wei Chong can't escape from Yuedi in the south and Hudi in the north, I will definitely not forgive you!" ”

At this time, although Cao Cao fought in Xuzhou and defeated Liu Bei and Cao Bao one after another, it was still very early to capture the entire territory of Xuzhou, and even Tao Qian could not be cleaned up in a moment, and after the news of Zhang Miao's betrayal of Lu Bu into Yanzhou came, Cao Cao's soldiers changed their minds and panicked, and they no longer had the conditions to continue fighting in Xuzhou.

And even if Cao Cao gave up Yanzhou in a desperate attempt and finally succeeded in controlling Xuzhou, it would be difficult for him to hold it, Cao Cao had too much blood on his hands when he invaded Xuzhou twice, and it was impossible for Cao Cao to win the hearts of the people of Xuzhou.

So at that time, it was inevitable for Cao Cao to return to the army to rescue Yanzhou. At this time, Xun Yu, Cheng Yu, Xiahoudun and others guarded Juancheng, the seat of Yanzhou for Cao Cao, and it was very important for Cao Cao to retain a base in Yanzhou.

As long as Juancheng is still there, Yanzhou will not be taken away by Lu Bu, as long as Cao Cao still has territory in Yanzhou, then the army will be returned, and the outcome is still unknown.