The Battle of Yiling was an important battle between Liu Bei and Sun Quan during the Three Kingdoms period. Although Liu Bei's army lost 50,000 men in the war, this war was an important turning point for Liu Bei. After the Battle of Yiling, Liu Bei's reputation had suffered a great blow, and his power and status had also been weakened. During the Battle of Yiling, Liu Bei's military style and tactics were also criticized, which forced him to readjust his military strategy and tactics. The Battle of Yiling also revealed the weaknesses of Liu Bei's army, such as the lack of training and combat effectiveness, especially in the early stages of the war. These weaknesses caused Liu Bei's army to suffer heavy losses in the war, resulting in low morale and a decline in combat effectiveness. The Battle of Yiling also symbolized the political instability of Liu Bei's forces. Liu Bei had lost a large number of supporters and allies in the war, which had threatened his political status. At the same time, Liu Bei's wrong decisions and indecisiveness in the war also aggravated his political instability. To sum up, the Battle of Yiling was a turning point for Liu Bei, which led him to begin his journey to decline. Although he lost 50,000 men, his weakness in military strategy and tactics, as well as political instability, led to his decline.