In the spring of the twenty-fourth year of Jianwu, the eight adults discussed Libi as Hu Han Evil Shan Yu, because Bi's grandfather had returned to the Han Dynasty to be peaceful, so he planned to attack the name of Hu Han Evil Shan Yu. So Bi came to Wuyuansai and expressed his willingness to be a barrier for the Han to defend against the enemy captives in the north. The emperor adopted the opinion of Geng Guo, the general of the Five Palaces, and agreed. In the winter of the year, than self-reliance, he called Han evil single Yu.

In the spring of the twenty-fifth year, Shan Yu sent his younger brother Zuoxian Wang Mo to lead more than 10,000 troops to attack Beidan Yu's younger brother Dian Tar Zuo Xian Wang, and captured Dian Tartar Zuo Xian King alive; He also defeated the army under Beidan Yu's account, merged more than 10,000 people from Beidan Yu's army, and obtained 7,000 horses and 10,000 cattle and sheep. Beidan Yu was very frightened and retreated a thousand miles. At first, the emperor made chariots, which could be driven by a few oxen, and built a tower on the cart, which was placed on the plug to resist the Xiongnu. At that time, the people who saw the chariot talked to each other and said: "The proverb says that the ninth generation of the Han Dynasty will make Beidi retreat for thousands of miles, is this what he is talking about?" By this time, the territory had been opened. In the north, the Marquis of Dian Tartar and the Marquis of the Right Bone led more than 30,000 people to defect to Nandan Yu, who sent envoys to the court again, called him a vassal with the gift of a vassal state, offered the treasures of the country, asked to send an envoy to supervise the protection, sent his son to serve in the court, and concluded the previous covenant.

Xiongnu customs, there are three dragon temples a year, generally in the first month, May, September of the Wu said to worship the gods. Since Nandan Yu returned to the Han Dynasty, he also sacrificed to the Han Emperor, taking this opportunity to convene various ministries to discuss state affairs, and hold horse and camel races for fun. Among the Xiongnu ministers, the honorable is the king of Zuoxian, followed by the king of Zuo Guli, followed by the king of right Xian, followed by the king of right valley, which is called "four corners"; The second is the king of the left and right days, followed by the thousand kings of Wen Yu on the left and right, and the second is the king of the left and right gradual generals, which is called "hexagonal": they are all the sons and brothers of Shan Yu, and they will be the people of Shan Yu in order. Ministers with different surnames have the left and right bone marquis, followed by the left and right corpses and bones, and the others have various official titles of the day, and the canal, and the production, each of which determines the level and order of the position according to the size of the power and the number of subordinates. Single-name imaginary conjunction. There are four surnames with different surnames: Huyan, Xubu, Qiulin, and Lan, who are famous ethnic groups in the Xiongnu and often intermarry with Shan Yu. They are responsible for adjudicating cases and accepting lawsuits, and they will orally tell Shan Yu the severity of the judgment, which is wrapped in a book without documents and notes.

In the winter of the twenty-sixth year, the sons of the five Gudu Marquis who had rebelled before led 3,000 men to the south, and Beidan Yu sent cavalry to pursue them and captured them all. Nandan Yu sent an army to resist and face the unfavorable battle. The imperial court then ordered Shaoshu to move Shan Yu to live in Xihe Meiji, and sent Zhonglang to leave Duan Chen and Deputy Lieutenant Wang Yu in Xihe to protect Shan Yu, so as to set up an official mansion, engage in it, and learn history for Shan Yu. He also ordered Xihe Changsheng to lead 2,000 cavalry every year, 500 prisoners who were released from the shackles, and help Zhonglang to guard Shan Yu, garrison it in winter, and withdraw it in summer, and since then it has been a regular practice. and exempted the eight counties along the border from all taxes and servitude.

After Nandan Yu lived in Xihe, he also set up various princes to help the Han resist the borders. Nandan Yu sent the Marquis of the Han Bone to garrison the north, the Right Xian King to garrison Shuofang, the Marquis of the Gudu to garrison Wuyuan, the Marquis of Huyan to garrison Yunzhong, the Marquis of Lang to garrison Dingxiang, the General Zuo Nan to garrison Yanmen, and the Marquis of Li Ji to garrison Daijun, and they all led the people of the department to reconnoiter the movements of the county as their ears and eyes. Beidan Yu was very frightened and returned many Han people who had been taken captive as a sign of friendship. Every time the army that came out to plunder passed near the south, or turned back to the post where the desert soldiers reconnoitred the enemy, they always apologized and said: "We are fighting the fugitive Dian Tartar and chasing the king, and we do not dare to invade the Han people." ”

In the twenty-seventh year, Beidan Yu sent an envoy to Wuwei to ask for peace, and the Son of Heaven summoned the ministers to discuss in the palace court, but decided not to come down. The crown prince said: "Nandan Yu has just surrendered, and the enemy captives in the north are afraid of being attacked, so they listen attentively and strive for justice. Now the imperial court cannot send troops, but instead communicate with the northern enemy, the minister is afraid that Nandan Yu will give birth to two hearts, and the northern enemy who is willing to surrender will not come to surrender again. The emperor thought it was reasonable, so he told Wuwei Taishou not to accept Beidan Yu's envoy.

In the twenty-eighth year, the Northern Xiongnu once again sent envoys to the imperial court, offering horses and furs, begging for peace again, and wanted to get the music of the Han, and asked the Hu people who led the countries of Xicheng to come to pay tribute and worship, and the emperor handed over the matter to the Three Dukes' Mansion to discuss the matter of replying. Situ Peng Banbiao said in the book: The minister heard that Emperor Xiaoxuan had instructed the generals guarding the border to say: "The Xiongnu are a big country, and there are many changes and frauds. If the relationship is reasonable, you can win the negotiation; Answered them

stratagem, in turn, was despised and bullied by them. "Now the Northern Xiongnu saw that Nandan Yu had come to surrender, and they were afraid that we would plot against them, so they begged for peace many times, and came from afar to do business with the Han and sent famous princes and tributes repeatedly, which were all used to show wealth and strength to the outside world, in order to deceive us. The more the ministers saw what the Xiongnu had contributed, they knew that the more empty the Xiongnu country was, and the more urgent the request for attachment and closeness, the greater their fear. However, since it has not been able to help the south now, it is not appropriate to cut off contact with the north, according to the principle of Huairou envelopment, Yu Lishu cannot fail to reply. The ministers thought that they could be given some reward, roughly equal to the value of what they had offered, and publicly informed them of the results of the affairs of the previous generation of Hu Han and Zhi branches.

The emperor adopted all of Ban Biao's opinions. In the twenty-ninth year, he gave Nandan tens of thousands of sheep. In the thirty-first year, the Northern Xiongnu sent an envoy again as before, and the emperor replied to Shan Yu with a seal book, giving him colored silk silk, and did not send a messenger.

Bi Li Weishan died nine years later, and Zhonglang General Duan Chen led his troops to mourn, pay tribute with wine and rice, and send troops to protect the Southern Xiongnu. The emperor sent an envoy with a seal book to appease him, and gave him a seal, a crown and a turban, three sets of crimson clothes, a knife and a ribbon worn by a child, and four thousand colored silk silks, which were given to the kings and officials below the marquis of Gudu. Since then, whenever Shan Yu has died, the Han Dynasty has gone to mourn and pay tribute, condolences and rewards, as a common practice.

Qiu Fu You Qianshan Yu Mo, succeeded to the throne in the first year of the Zhongyuan Dynasty, died a year later, and his younger brother Khan was established as Shan Yu.

Iva was considered to be a thousand single in Khan, and in the second year of the Middle Dynasty, he was established as a single Yu. In the second year of Yonghu, the Northern Xiongnu Huyu Qiu led more than 1,000 people to surrender. Southern Shan Yu Khan died in the second year of his reign, and Shan Yubi's son Shi succeeded him.