The reason why Liu Bei and Zhuge Liang did not send troops to rescue Guan Yu is not clear in history, but there are some possible explanations.

First, sending a large number of troops to support Guan Yu by Liu Bei and Zhuge Liang may have made the Wei and Dong Wu feel threatened, thus intensifying their attacks on Shu Han. This is also one of the reasons why Shu Han continued to strengthen the defense of the northwest border during this period.

Second, Liu Bei and Zhuge Liang may have also believed that the situation Guan Yu faced was irreversible. Because during Guan Yu's attack on Xiangyang, Cao Cao and Sun Quan tightened their defense of Jingzhou and Jiangdong, and took the initiative. Against this backdrop, sending a large number of troops to support Guan Yu may have only increased the losses of Shu Han.

Finally, it may also be because Liu Bei and Zhuge Liang were dissatisfied with Guan Yu's actions. According to historical records, Guan Yu did not follow Liu Bei's advice when attacking Xiangyang, which may have led to Guan Yu's defeat. Therefore, Liu Bei and Zhuge Liang may have believed that Guan Yu had brought this upon himself and was not worth supporting.

Regardless of the reasons, Guan Yu's failure and death have become historical facts. Although some people have tried to explain this event through conspiracy theories, most historians believe that these claims are not supported by sufficient evidence.

　　Disclaimer: The above content is sourced from the internet and the copyright belongs to the original author. If there is any infringement of your original copyright, please inform us and we will delete the relevant content as soon as possible.