Guan Yu shouted the slogan of letting Liu Bei avenge him before he died. Later, Liu Bei really led the Shu army to attack Dongwu, which led to Liu Bei's direct loss of 750 thousand troops. Of course, Liu Bei attacked Dong not only to avenge Guan Yu, but also to recapture Jingzhou, because this place is too important to him, just as Zhuge Liang said when he was in the Dragon Squadron. If Liu Bei wants to win the world, he must win Jingzhou and Yizhou. It is possible to realize his desire to unify the world, so Liu Bei must firmly hold Jingzhou in his own hands.

In addition to subjective factors, Guan Yu's loss of Jingzhou also has a lot to do with Liu Bei. Zhuge Liang said a long time ago that Guan Yu was a very arrogant man. He is not fit to be a general in Jingzhou, but he wants to put Jingzhou under his nose, and Liu. Don't listen to Zhuge Liang at all. He thinks that Guan Yu, the second brother, is a general and there is no problem in guarding Jingzhou. What Liu Bei said is not wrong. But there are also mistakes. There is nothing wrong with Liu Bei and Guan Yu's ability to defend Jingzhou, but there is something wrong with his character. This is indeed a fatal problem.

Jingzhou has always been a battleground for military strategists. Sun Quan, Cao Cao and Liu Bei all want this place. In fact, after Jingzhou fell, Intellectually speaking, Liu Bei should not take the initiative to attack Soochow. Because Liu Bei didn't have the strength at that time, from a big strategic point of view, he should still unite Sun Quan against Cao Cao. Only in this way can Liu Canbei hope to unify the world.

But Liu Bei couldn't wait because he was very old at that time. Liu Bei has been wandering from place to place for the first half of his life. No chance to prove myself. At this age, he is still ambitious, and he hopes to see the unity of the world before he dies. So, in the end, he had to try, but he also paid the price for his impulsive behavior. The army he led was almost wiped out, and the Shu-Han regime was in jeopardy.