After Han Gaozu Liu Bang ascended the throne, he once publicly praised the talents of his subordinates, and because of his words, Zhang Liang, Xiao He, and Han Xin became the "Three Masters of the Early Han Dynasty", and Liu Bang said very modestly that he only defeated Xiang Yu and won the final victory by relying on the ability to employ people. This is naturally true, but in fact, Liu Bang's own ability is not small, at least the merits he has established are enough and large enough.
However, after the establishment of the Han Dynasty, Liu Bang, who had deep doubts about the princes with different surnames, did not let these people live with peace of mind. The successive rebellions of Zang Di and Han Wangxin and others made Liu Bang even more firm in his suspicions, among them, Han Wangxin was originally a candidate sent by Liu Bang to defend the Xiongnu, but the strength of the Xiongnu at that time was no longer what it used to be, how could a Han Wangxin resist the enemy? Moreover, the leader of the Xiongnu, Mao Dundan, was definitely not a small role.
Mo Dun Shan Yu also experienced a court tilt similar to that of the Central Plains royal family. He was originally the eldest son of his father Touman Danyu, the position of prince was his bag, but unexpectedly Touman's younger son was born, this young son was very popular with Touman, coupled with the pillow wind of the Fu clan, Touman actually wanted to let the eldest son go to death, sent him to the Yue clan to be a proton, and as soon as Mo Dun arrived there, Touman announced that he would start a war against the Yue clan.
At this point, Touman's intentions have been exposed. However, he did not expect that Mao Dun was more ruthless than himself, not only single-handedly killed back the tribe, but also Tao Guang raised obscure fathers to stand on his own, Mao Dun trained Xiongnu elite soldiers, broke the Eastern Hu, Yue clan, Lou Fu, etc., and even the territory that Qin took away from Meng Tian was taken back by him, and the powerful Xiongnu Empire was established in the north and south of the desert, directly threatening the Han Dynasty.
When Han Wangxin defected to the Xiongnu, Liu Bang was furious and took Chen Ping, Lou Jing, Fan Duo, Xiahou Bao, and Zhou Bo with him, and the imperial conquest went to fight Against Dun Shan Yu, but he made a fatal mistake: the light enemy ventured forward. The Xiongnu were about to collapse at a touch, which gave Liu Bang great confidence, he believed that the Strength of the Xiongnu was no more than that, so he took advantage of the victory to pursue, and as a result, he fell into the trap set by Mo Dun and was surrounded by 400,000 Xiongnu troops on Baishan Mountain.
Of course, Liu Bang finally escaped, as for the reason for his escape, some say that Chen Ping made a strange plan, so that Mao Dun's Fu clan made a speech to Mo Dun and persuaded Mo Dun to let Liu Bang go; others said that the Han army infantry led by Zhou Bo defeated the Xiongnu left and right Xianwang, and copied the Xiongnu cavalry from the back, and Mao Dun was afraid that he would not be able to get good fruit to eat, so he took a step back, let Liu Bang go, and temporarily negotiated peace.
In short, Liu Bang woke up after suffering losses here in Maodun and realized that the Xiongnu were powerful, and only by recuperating, accumulating strength, and then breaking through in one fell swoop was the best policy. To this end, he not only pardoned Lou Jing, who had previously advised him not to rush forward, but was locked up by him, and reused this person again, but also followed Lou Jing's advice and chose the princess of the clan to marry Mo Dun Shan Yu (at first he wanted to marry the eldest princess of his own birth, but Lü Hou resolutely disagreed).
Liu Bang did not shake the foundation of the Xiongnu until his death, and when he saw that the Han Dynasty could not defeat him, he gradually became a little arrogant, not only repeatedly harassing the Han Dynasty's border areas, but even teasing Liu Bang's wife Lü Yan. In 195 BC, Mo Dun wrote to Lü Yan, proposing that he wanted to see the scenery in the Central Plains, and said that he and Lü Yan were equally lonely and lonely, so why not be one and better, and exchange what they had for what they had?
After receiving the letter, Lü Yan was naturally furious, and resisted under the persuasion of Ji Bu, and wrote back to Mo Dun saying that he was old and not worthy of Mo Dun's favor, and his words were very modest. A momentary forbearance is for revenge in the future, this point, the Han Dynasty can be said to be exactly the same as the young Mao Dun, after the rule of Wenjing, Emperor Wu of Han ascended the throne, the Xiongnu cavalry lost to the Han Dynasty cavalry, Liu Bang under the Nine Springs if he can know, I am afraid he will be overjoyed.