After the establishment of the Three Kingdoms, the State of Wei was the most powerful, followed by the State of Eastern Wu and Shu, so Shu wu formed an alliance against the State of Wei. Gradually, in the alliance, the power of the Shu state became more and more prosperous, the generals and strategists and other talents were abundant, the hidden forces surpassed the Eastern Wu, and the Shu state reached its peak in Chengdu to claim the emperor. In order to expand his power, Liu Bei chose to enter Sichuan shu to attack Liu Zhang, so Jingzhou was left to Guan Yu to guard.
Guan Yu carelessly lost Jingzhou
Guan Yu made great contributions to the rise of the Shu state, but Guan Yu eventually became a turning point in the decline of the Shu state. Guan Yu was not at peace with Jingzhou, and after cultivating for a while, he started the idea of the State of Wei, so Guan Yu launched the famous Battle of Fancheng. Fancheng was the forerunner of the Xu capital of the State of Wei and was a very important place. Guan Yu defeated the Wei army in the Battle of Fancheng, and even flooded the Yu Forbidden army that came to support.
Later, at Guan Yu's facilitation, the State of Wei and Eastern Wu chose an alliance to surround and kill Guan Yu together. Sun Quan sent a general to besiege and kill Lü Meng, and before Lü Meng left, Sun Quan also ordered Guan Yu to stay alive. Guan Yu was attacked in the front battlefield, and was carelessly defeated and defeated maicheng, and finally killed by Lü Meng. After the matter reached this point, Sun Quan could only sacrifice Guan Yu's head to Cao Cao, and even gave cao Cao the credit for killing Guan Yu.
If Lü Meng obeyed Sun Quan's words and did not kill Guan Yu, and the last thing to give Cao Cao was the living Guan Yu, then how would Cao Cao deal with Guan Yu? There are no more than four outcomes - kill and descend. The first possibility to kill Guan Yu, Guan Yu's return to the Shu kingdom is definitely unfavorable to Cao Cao, once Cao Cao let Guan Yu go once but brought endless trouble to himself, so the second time he captured Guan Yu, Cao Cao will definitely not let Guan Yu go, then killing has become the best means. But Cao Cao loved Guan Yu, and everyone in the world knew it, so the possibility of killing Guan Yu would not be very large.
The second possibility is to persuade Guan Yu to surrender, which should be the most difficult of the three hypotheses to achieve. Guan Yu was known for his loyalty, and the first time the high-ranking official Hou Lu did not tempt Guan Yu, the possibility of the second time Guan Yu surrendering to Cao Cao was almost zero. The third type of imprisonment of Guan Yu, this possibility has a high probability of occurrence. Since Guan Yu could not persuade him to surrender, cao Cao was reluctant to kill, so Guan Yu would definitely be imprisoned. From various points of view, this method can not only ensure Guan Yu's life, but also ensure that Guan Yu will not operate with Cao. The fourth way to return Guan Yu to Liu Bei was the best way to break up the alliance between Eastern Wu and Shu. Eastern Wu rebelled against Guan Yu, and Liu Bei already had resentment in his heart, so returning Guan Yu would definitely cause civil unrest to Sun Liu. In summary, the probability of the third and fourth possibilities is relatively large.