In 307 BC, King Wuling of Zhao ordered to "change his uniform, ride and shoot", build the Great Wall at the southern foot of Yinshan Mountain, recruit Hu soldiers, defend the Huns in the north, and conquer Qin in the south. He then attacked Zhongshan Kingdom six times, and finally destroyed his old enemy Zhongshan Kingdom in 296 BC.
In 302 BC, King Wuling of Zhao ordered the slaves of officials and officials to move to Jiuyuan, and ordered generals, officials, legitimate sons, and acting officials, all wearing Hu clothes, to immigrate to Shibian.
In 265 BC (the first year of King Zhao Xiaocheng), the Xiongnu took advantage of the competition among the Central Plains princes to occupy the north and south of Yinshan Mountain in Hetao. In 244 BC, Zhao general Li Mu defeated more than 100,000 Xiongnu cavalry.
In 215 BC, Emperor Qin sent General Meng Tian to lead an army of 300,000 men to station in Jiuyuan to attack the Xiongnu in the north.
In 127 BC, General Wei Qing of the Western Han Dynasty attacked the Xiongnu and recovered Jiuyuan (named Wuyuan in the Han Dynasty) and other places.
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