Chinese mythology, folktales, and literature
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In 211 CE, news reached Liu Zhang, governor of Yizhou (modern Sichuan province), that Cao Cao planned to march through Guanzhong to attack Hanzhong – the northern gateway to Yizhou.
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In 201, Liu Bei was defeated by Cao Cao in Runan and lost his base, so he fled south to Jingzhou to seek the protection of Liu Biao. Liu Biao also needed Liu Bei as a northern barrier against Cao Cao, so he granted Liu Bei a thousand troops and stationed him in Xinye.