After the Qin and Han Dynasties destroyed the Six Kingdoms, why not destroy the Huns?

Qin Shihuang got a meteorite, which said that Hu was the man who destroyed Qin, so he sent Meng Tian to Xiongnu and civilian workers to build the Great Wall. In the thirty-three to thirty-four years of Qin Shihuang (2 14 BC-2 13 BC), Qin Shihuang sent general Meng Tian to attack the Huns in the north.

During the Warring States Period, Huns living in the north of China had entered the slave society. It occupies the vast grassland areas in Inner Mongolia and Ningxia today. At that time, the Central Plains countries had no time to look north, and the Huns often raided the northern border areas of Qin, Zhao and Yan bordering them. After Qin Shihuang annexed six countries, Meng Tian ordered 300,000 troops to attack the Xiongnu in the north in order to relieve the Xiongnu's threat to Qin. In the spring of thirty-three years, the main force of Meng Tian's unification attacked its east from Shang Jun (the county for treating skin, now south of Yulin City, Shaanxi Province). Yang Wengzi led a division from Xiaoguan (now southeast of Guyuan, Ningxia) to the Great Wall and attacked its west. Xiongnu fled after defeat. The State of Qin then seized the land in Henan (now the land in Yike, south of Inner Mongolia River and Zhao Meng). There are 44 counties along the river, and immigrants will be cultivated. Due to the continuous attack of Xiongnu, the following autumn, Qin Shihuang ordered Meng Tianjun to cross the Yellow River north, take Gaoque (now the Jilan Pass in the middle of Langshan Mountain in Inner Mongolia), capture Yangshan Mountain (now the Langshan Mountain and Yinshan Mountain in the north of Wu Jia, Inner Mongolia), and take a vacation to the north (now the Jiashan River area south of Wu Jia). The Huns were defeated and moved north. In order to consolidate Henan, Qin established Jiuyuan County (the county governs Jiuyuan, now northwest of Baotou City, Inner Mongolia). In order to prevent the fierce slaves from going south, Meng Tian was ordered to recruit a large number of migrant workers to build the Great Wall of Wan Li from Lintao (now Min County, Gansu Province) in the west to Liaodong in the east, which played an important role in consolidating the northern border of Qin. The Qin Dynasty's victory over Xiongnu was the first and heaviest blow to the invading army of Xiongnu nobles.

Because Tou Man was invincible in Qin State, Xiongnu Khan was forced to "move northward" for more than ten years.

Therefore, Jia Yi, a famous political commentator in the early Han Dynasty, called it "more than 700 miles away from the Xiongnu, the Hu people dare not go south to herd horses, and the scholars dare not bow down." Sang Hongyang also said: After Meng Tian's counter-offensive, "Huns were too strong and looked south for more than ten years". This counterattack relieved the intrusion and destruction of the Xiongnu slave owners and nobles, "took over the land of Henan", and freed the vast areas inside and outside the Hetao and north and south of the river from the long-term disaster of war. At the same time, the court moved a large number of criminals, "the beginning of the real county." In the thirty-fifth year of Qin Shihuang (2 12 BC), the number of people migrating to the border was further increased. In addition to criminals emigrating, ordinary people are also encouraged to emigrate to border areas. For example, in the thirty-sixth year of the first emperor (2 1 1 BC), 30,000 mainland immigrants settled in Beihe and Yuzhong at one time, and all of them went to "first class". While cultivating land and guarding the border, these immigrants and criminals played an important role in developing the northern border and enriching military equipment.

This is of positive significance to the formation of a unified multi-ethnic country in ancient China, the promotion of economic and cultural development in these remote areas, and the protection of the lives and property of people of all ethnic groups, including the Huns. You see, the Huns come to the Central Plains to rob every year, which is nothing to remember. At that time, cavalry was still in the mainstream. In addition, the desert is vast and sparsely populated, and it is not good to completely eliminate it.