Guan Yu was an important general of Shu Han during the Three Kingdoms period, and his sacrifice was a huge loss for Shu Han. According to historical records, Guan Yu was killed in a battle with the Eastern Wu army.
Guan Yu was besieged by the Eastern Wu army during the Battle of Jingzhou, and the Eastern Wu general Lü Meng adopted the tactic of luring the enemy deep into a treacherous area. There, the Soochow army launched a fierce attack on Guan Yu, who, though valiant, was eventually outnumbered and killed.
According to the Chronicles of the Three Kingdoms, Guan Yu was seriously wounded in the battle, but he still insisted on fighting until the last moment. His sacrifice was not only because of the strength of the Eastern Wu army, but also because of his loyalty to Shu Han and his dedication to war.
Guan Yu's sacrifice also triggered a series of incidents. The first is Liu Bei's revenge battle against Eastern Wu, that is, the Battle of Yiling. The war ended in the defeat of Shu Han, and Liu Bei also died shortly after the war. The second was the political struggle within Shu Han, which led to the decline and demise of Shu Han.
Overall, Guan Yu's sacrifice was a historical event that not only affected the political landscape of the Three Kingdoms period, but also became an important event in Chinese history.