structural:expansion, structural:summarization, stylistic:tone
Liu Bei's takeover of Yi Province

Relations between Liu Bei and Sun Quan deteriorated after Zhou Yu's death, but not to the point of war. Following Zhuge Liang's Longzhong Plan, Liu Bei led his forces westward into Yi Province and seized control of the territories from the governor Liu Zhang. By then, Liu Bei ruled over a vast stretch of land from Yi Province to southern Jing Province; these territories served as the foundation of the state of Shu Han later. Liu Bei declared himself King of Hanzhong after defeating Cao Cao in the Hanzhong Campaign and capturing Hanzhong Commandery.

At the same time, Emperor Xian awarded Cao Cao the title of a vassal king – King of Wei – while Sun Quan was known as the Duke of Wu. In eastern China, Sun Quan and Cao Cao's forces fought in various battles along the Yangtze River, including the battles of Hefei and Ruxu, but neither side managed to gain a significant advantage over the other.