In the 24th year of Jian 'an (2 19), Liu Bei crossed Mianshui from Yangping and settled in Dingjun Mountain. Xia led a great army to deus ex. Liu Bei led more than ten thousand soldiers and captured Zhang He in ten nights. Zhang He led Sineitai to fight back, but Liu Bei couldn't beat him. Xia sent Zhang He to guard the eastern part of the antlers, while he led the elite to guard the southern part of the antlers. Liu Bei then stormed Zhang He with all his strength, and Zhang He was defeated. Xia then divided his troops into half to save Zhang He, so Liu Bei adopted the strategy of burning the corner of the encirclement in the valley, and sent general Huang Zhong to raid the deep army and Xia. Say yes.

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In the 19th year of Jian 'an (2 14), shortly after Liu Bei defeated Liu Zhang to conquer Chengdu, Cao Cao also captured Hanzhong. Hanzhong and Shu are as close as lips and teeth If Shu does not control Hanzhong, the security of Chengdu, its capital, will always be threatened by Cao Jun. Therefore, in the 22nd year of Jian 'an (2 17), Liu Bei entered Hanzhong, entered Yangpingguan, the western gateway of Hanzhong (now Mianxian County, Shaanxi Province), and competed for Hanzhong with Xia, commander of Cao Jun, but the two armies were deadlocked for more than a year.

In the 23rd year of Jian 'an (2 18), Liu Bei led the Shu-Han army to attack Hanzhong, and fought with Zhang He for many years, without any breakthrough. The attack is difficult and the defense is tenacious. In the 24th year of Jian 'an (2 19), Liu Bei obeyed Fazheng's plan, led his troops across Mianshui River and went straight to Dingjun Mountain, occupying the favorable terrain of Dingjun Mountain, and the battle of Dingjun Mountain began with the battle of Xiahou Yuan.