The death of Guan Yu was indeed a significant turning point in the history of the Three Kingdoms, but Zhuge Liang did not fail to consider rescuing Guan Yu.

When Guan Yu was besieged, Zhuge Liang once sent Pang Tong and Ma Su to rescue him, but due to various reasons, the rescue operation led by Pang Tong and Ma Su ultimately failed, and Guan Yu was captured by the Eastern Wu.

In addition, Guan Yu did not seek timely assistance from Liu Bei and Zhuge Liang when he fled to Maicheng. Guan Yu's own choices also played a crucial role. If Guan Yu had sought timely assistance from Liu Bei and Zhuge Liang, and if the rescue operation led by Pang Tong and Ma Su had been successful, perhaps Guan Yu's fate would have been different.

Overall, Guan Yu's death had a profound impact on the entire history of the Three Kingdoms. However, it cannot be entirely blamed on Zhuge Liang for not rescue Guan Yu in time, as the situation at that time was extremely complex, and many factors and reasons led to this tragedy.

Perhaps it was because Zhuge Liang overestimated his own wisdom, believing that he could stabilize the position of Shu Han without taking risks to rescue Guan Yu. He may have believed that even if Guan Yu escaped, he could not make a significant contribution to the future of Shu Han. Additionally, Zhuge Liang may have also believed that allowing Guan Yu to die in the hands of the Eastern Wu could create a reason for war for Liu Bei, allowing him to attack the Eastern Wu and further expand the influence of Shu Han.

Regardless of the reasons, Zhuge Liang's decisions brought a heavy blow to Shu Han. His negligence not only led to the death of Guan Yu but also resulted in the defeat of Shu Han in the Yi Ling battle. This defeat left Liu Bei politically isolated, with no forces willing to help him defeat the Eastern Wu. At this point, the situation of Shu Han became even more precarious, destined to struggle in the coming decades.

In conclusion, Guan Yu's death was an inevitable tragedy for the entire history of the Three Kingdoms. This period of history was filled with war, betrayal, and political struggle, making one marvel at the fragility and sadness of humanity. However, even in such a dark era, heroes like Guan Yu existed, and his loyalty and courage will always be worthy of our remembrance and adoration.

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