abstract
| - Before the end of the Han Dynasty, the warlord Ma Teng commanded a sizable army in the northwestern frontiers of China that threatened the North China Plain controlled by Cao Cao. When Cao Cao finished his unification of northern China in 207, he wished to turn south to attack Liu Bei and Sun Quan; so to avoid being attacked from behind, Cao Cao appointed Ma Teng as an official and summoned him to Ye City. Ma Teng and some of his family members were effectively held hostage to prevent Ma Teng's son, Ma Chao, from invading Cao Cao's territory. Cao Cao's southern expedition did not go well; however, as he was defeated by the combined forces of Sun Quan and Liu Bei at the Battle of Red Cliffs in 208. He soon turned his attention west instead, with the intention to invade Guanzhong. In March 211, Cao Cao sent Zhong Yao to attack Hanzhong (Han'ning), which was controlled by Zhang Lu, while sending Xiahou Yuan to rendezvous with Zhong's forces. Gao Rou cautioned Cao Cao against such a move, saying that sending massive armies west could draw suspicion from the western warlords and cause the latter to revolt. However, Cao Cao paid no heed to his advice. As predicted, the western forces began suspecting an assault from Cao Cao, and soon Ma Chao, Han Sui, Hou Xuan, Cheng Yin, Yang Qiu, Li Kan, Zhang Heng, Liang Xing, Cheng Yi, and Ma Wan (馬玩) rallied their armies and marched on Tong Pass (in present-day Tongguan County, Shaanxi). The coalition comprised a mixture of Han Chinese, Qiang, and Hu soldiers. Many counties of the area joined the uprising, and some civilians had to escape into Hanzhong via Ziwu Valley (子午谷). In response, Cao Cao ordered Cao Ren to defend against the invading forces and issued orders that they must refrain from engaging the enemy.
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