Battle of Chibi

The Battle of Chi Bi was a defining battle of the Three Kingdoms era, and is thought to have caused the founding of the three. In it, Liu Bei after succesfully escaping Cao Cao at Chang Ban formed an alliance with Sun Quan to resist the approaching navies of Cao Cao. With both kingdoms working together, and with the combined brilliance of Zhou Yu, Zhuge Liang, and Pang Tong, Cao Cao's fleet was set aflame, and Cao Cao was barely able to escape with his life.

Aftermath
The battle halted Cao Cao's advance southward, and established a long term alliance between the Sun and Liu families, however, Liu Bei took advantage of Cao Cao's retreat to seize Jing province which was the beginning of a dispute that would tear the alliance apart, and while Zhuge Liang was in Wu to plan the battle, Zhou Yu tried several times to murder him so that he would not harm Wu's intrests in the future, failing each time however, and he became so frustrated that he died.

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