In 211, Liu Zhang, following Zhang Song's advice, sent Fa Zheng to invite Liu Bei into Sichuan to help him resist Zhang Lu, when Liu Bei was preparing to plot against Yizhou at the suggestion of Fa Zheng and Pang Tong. However, this time it was not easy to enter Sichuan to compete for Yizhou, Liu Bei entered Sichuan in 211, knowing that it was only in 214 AD that it took more than three years. However, after occupying Yizhou, Liu Bei's strength increased greatly, and he became more and more courageous, first defeating Cao Cao in the Battle of Hanzhong and capturing Hanzhong, then he sent Meng Da and Liu Feng to capture the three counties of Shangyong, Guan Yu took advantage of the situation, led his army north, besieged the two cities of Xiangfan, successfully defeated Yu Ban, and made the 30,000 troops surrender. It was seen that the Shu Han forces were about to usher in its most powerful moment, but at this moment, Sun Quan sent Lü Meng to cross the river in white clothes, defeated Guan Yu and occupied Jingzhou.
In fact, whether It is Liu Bei attacking Liu Zhang, or Sun Quan attacking Liu Bei, both belong to the category of sneaking allies, and morally speaking, these two acts are despicable, but it is puzzling that the same is the same sneak attack on allies, and the evaluation of the two is very different in later generations. Liu Bei's attack on Yizhou did not have too many people reprimand Liu Bei in later generations, but Sun Quan's attack on Jingzhou made posterity much more criticized. Since both were sneaking allies, both of which could not be morally justified, why was Sun Quan spurned and Liu Bei rarely blamed?
In fact, there is a certain difference between the two, mainly because the motivation for the two to contribute and act is not the same. Liu Bei entered Yizhou at the invitation of Liu Zhang, who was on the front line around Yemengguan to help Liu Zhang resist Zhang Lu, although there was no record of Liu Bei fighting with Zhang Lu at that time, so that a large number of later commentators believed that Liu Bei was passive and sluggish, but from a reasonable point of view, if Zhang Lu did not meet Liu Bei and stopped his military operations, this is also not credible, he at least to do some military inquiries, otherwise he could not know Liu Bei's military strength. Therefore, after Liu Bei entered Sichuan, he served Liu Zhang.
However, Su Qin was different, after the incident between Borrowing Nan Commandery and Changing Jingzhou, Sun Quan and Liu Quan were divided by Sun Quan, at that time Sun Quan also wanted Liu Bei to share part of his own pressure, which led to an exchange between the two sides on the territory, and during the Sun Liu Alliance, Sun Quan did develop towards Jiaozhou, which shows that neither of them owes anyone, but in this case, Sun Quan still took the initiative to launch a sneak attack, defeated Guan Yu, and captured Jingzhou, and the reason why Liu Bei launched a war was also after Zhang Song was killed. Therefore, the treatment and motivation of the two are not the same.
The author believes that in comparison, Liu Bei's hands still have a certain truth, Sun Quan's hands are incredible, and it is for this reason that the difference between the two things will be so big.