First of all, we all know that Guan Yu was finally captured and killed by Sun Quan. You should know that Guan Yu is promising and loyal to Liu Bei. If Guan Yu had not been killed, I believe the ending of Shu Han would have been rewritten. It is a pity that Guan Yu was careless in planning, which can be said to be a pity.
Secondly, we all know that Guan Yu failed in Maicheng. Is Guan Yu really destined to see the devil? Actually, it's not. Originally, Guan Yulai had a chance, but it was ruined by Meng Da, the lieutenant of Liu Feng. Meng Da said to Liu Feng when Guan Yu sent troops to fight. Guan Yu's careless invasion is bound to fail. He will certainly come to you for help. You should take the opportunity to kill him, so that we can find Cao Cao with Xiang Yu's head and you will have vitality ...?
Then, when Liu Feng heard Meng Da say this, he didn't want to talk to him and wanted to arrest him. However, Mengda added: My Lord, don't think that Liu Bei can't leave the emperor to you. He has his own son, and taking refuge in Cao Cao is your only life ...? After listening to Meng Da's analysis of the situation, Liu Feng felt that Liu Bei would not do this to himself, so he wanted to take this opportunity to seize the military power in Guan Yu's hands and put Guan Yu's death on Meng Da, so that he could reap the benefits of the fisherman.
Finally, Guan Yu was forced to ask Liu Feng for help. Liu Feng really walked out of the ruins like Meng Da said. In the end, Guan Yu died and Liu Bei was furious. Liu Bei couldn't help killing Liu Feng. After all, to consider the forces behind Liu Feng. But Zhuge Liang's words made Liu Bei understand that Liu Feng's staying was a future trouble, so he killed Liu Feng on the pretext of killing Guan Yu. Liu Feng didn't understand what Mengda said until he died. He said loudly: I regret not listening to Mengda! ?