Background
In 194, while Cao Cao was away attacking Tao Qian in Xu Province, his subordinates Chen Gong and Zhang Miao rebelled against him and aided Lü Bu in taking over Cao's home base of Yan Province. Cao Cao abandoned his invasion of Xu Province and turned back to attack Lü Bu, culminating in the Battle of Yan Province that lasted for more than 100 days. By 195, Cao Cao had retaken all his cities in Yan Province and defeated Lü Bu at Juye. Lü Bu and his men fled east to join Liu Bei, who had succeeded Tao Qian as Governor of Xu Province.
In 196, Cao Cao found Emperor Xian in the ruins of Luoyang and brought him to Xuchang, where the new capital and imperial court would be based. In the same year, Lü Bu took advantage of the conflict between Liu Bei and Yuan Shu to capture Xiapi (present-day Pizhou, Jiangsu), capital of Xu Province, effectively seizing control of the province from Liu Bei. Liu Bei was forced to surrender his governorship of Xu Province to Lü Bu and settle in the nearby city of Xiaopei. Not long later, Lü Bu felt threatened by Liu Bei's presence and led his troops to attack Liu. Liu Bei was defeated by Lü Bu and had no choice but to join Cao Cao. Cao Cao provided Liu Bei with supplies and sent him to garrison at Xiaopei.
Around 197, Yuan Shao was in control of the three provinces of Ji, Qing and Bing north of the Yellow River, so he wrote a letter to Cao Cao in an arrogant tone. Around the same time, Cao Cao had just been defeated by Zhang Xiu at the Battle of Wancheng and the letter angered him. Cao Cao felt threatened by Yuan Shao's growing influence in northern China and wanted to attack Yuan, but felt that his forces were not strong enough. Cao Cao's strategists Guo Jia and Xun Yu assessed the situation, listing out the various advantages Cao Cao had over Yuan Shao. They also advised him to use the opportunity to eliminate Lü Bu when Yuan Shao was at war with Gongsun Zan, because it was possible that Yuan Shao might ally with Lü Bu to attack him. Cao Cao then made preparations for a campaign against Lü Bu.
Read more about this topic: Battle Of Xiapi
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