When Guan Yu surrendered to Cao Cao, he put forward three conditions. As long as Cao Cao agrees, he is willing to surrender. These three conditions are:
1, not Cao, but Han;
2. Two ladies who are good to Liu Bei;
Once Liu Bei's whereabouts are known, Guan Yu will leave immediately, and Cao can't stop him at all.
In the battle of Guandu, Cao Cao's generals didn't know what to do with Yan Liang. Cheng Yu suggested to Cao Cao that Guan Yu be invited to play. Guan Yu beheaded Yan Liang and punished Wen Chou, which made great contributions to Cao Cao. Soon Liu Bei learned that Guan Yu was in Cao Cao's camp and sent a letter to Guan Yu. Guan Yu saw Liu Bei's letter and decided to go back to Liu Bei and meet him in Runan.
Guan Yu sealed up the gold, silver, jewels and beauties given by Cao Cao, took Liu Bei's two wives, rode on a red hare, took a dragon crescent moon blade and went out to vote for Liu Bei.
When Cao Cao heard this, he asked Zhang Liao to tell Guan Yu that he would take someone to see Guan Yu off and give him a brocade robe. Guan Yu was very alert, took the robe and continued on his way. Next, he broke through the famous five customs and six generals.
Because Guan Yu left in a hurry, there was no customs clearance document issued by Cao Cao, so the generals along the way were not released. Guan Yu killed Kong Xiu, Han Fu, Mencius, Bian Xi, Wang Zhi, Chyi Chin and others, and Guan Yu killed Chyi Chin, which led Xia Houdun to lead troops to stop Guan Yu.
Because Chyi Chin is the Ministry of Xia Houdun, and Xia Houdun is the most powerful person in Cao Cao's camp except Cao Cao, and now Guan Yu has killed Xia Houdun's Ministry, so Xia Houdun refused to let go and caught up with Guan Yu with 300 people. A big war is about to break out.
When the two men were preparing for war, the messenger sent by Cao Cao arrived, holding the customs clearance documents that Cao Cao gave Guan Yu. However, Guan Yu has already killed people, passed five customs and beheaded six generals, which has already caused a fait accompli. Xia Houdun seized this opportunity and refused to let Guan Yu go. Even though the messenger of Cao Cao brought the document, Xia Houdun ignored it and still wanted to kill Guan Yu.
The two also played for about ten rounds, regardless of the outcome. Guan Yu's forces far exceeded Xia Houdun's. During the battle of Guandu, all Cao Cao's generals were afraid to face Yan Liang, including Xia Houdun. In the face of powerful enemy Yan Liang, Xia Houdun is extremely timid. He came to Guan Yu just to bully him by virtue of his numerical superiority.
Guan Yu had killed Yan Liang and Wen Chou before this. Speaking of what Yan Liang and Wen Chou said to Xia Houdun, Xia Houdun was defeated, not to mention Guan Yu. Xia Houdun only dares to cross in the nest. Fortunately, Zhang Liao arrived at this time and conveyed the news of Cao Cao, saying that Guan Yu was allowed to leave. Xia Houdun didn't take the messenger seriously, but he didn't dare to take Zhang Liao seriously and knew Zhang Liao's force.
At this time, Xia Houdun had nothing to say, so he had to let Guan Yu go. Guan Yu left this time, and he already owed Cao Cao, so he dared not do anything. Since Xia Houdun gave up, Guan Yu left without saying anything. Guan Yu was able to leave because of Cao Cao's generosity.
Cao Cao greatly appreciated Guan Yu's loyalty, and at the same time understood that it was not sweet to twist a melon. Guan Yu was reluctant to stay, and it was meaningless to stay. Cao Cao was patient and tried his best to make Guan Yu owe himself a favor. It was this favor that saved Cao Cao's life in Huarong Road after Battle of Red Cliffs.
A few years later, Cao Cao was defeated and fled in Chibi. When crossing Huarong Road, Guan Yu led the troops. Guan Yu released Cao in order to repay the favor owed by the five customs and six generals. I have to say that Cao Cao has a long-term vision.
As for Xia Houdun, Guan Yu didn't want to do things too well. Although Guan Yu is fully capable of killing Xia Houdun, Xia Houdun is the most important person for Cao Cao. If Guan Yu kills Xia Houdun, it may cause more hatred, and he may really be unable to leave.
Guan Yu just wanted to leave quickly and didn't care too much, so he didn't kill Xia Houdun. Otherwise, Xia Houdun had ten heads, all of which were cut by Guan Yu's dragon crescent moon blade.