Among the princes with different surnames, Han Wangxin (Han Xin, the grandson of the Warring States Han Xiang Wang, was named the king of Han by Liu Bang, in order to avoid confusion with the famous general Han Xin, so it is called Han Wangxin) fief in the Yingchuan area, and the king is Yangzhai (Yuzhou, Henan).

Yangzhai is located in the hinterland of the Central Plains, Liu Bang was worried that Han Wangxin would pose a threat in the future, so in the name of defending against the Xiongnu, Han Wangxin moved to Taiyuan County, and set the capital Jinyang (Taiyuan, Shanxi). Han Wangxin was not stupid, knowing that Liu Bang did not trust him, so he wrote that Jinyang was too far away from the frontier and was not conducive to guarding, and requested that the royal capital be moved to Mayi (Shuozhou, Shanxi) further north, which was approved by Liu Bang.

Han Wangxin fought with the Xiongnu, and lost more than victory. In the autumn of 201 BC, Mao Dunshan led an army of 100,000 to besiege Mayi, and Han Wangxin sent envoys to the Xiongnu to sue for peace. The imperial court suspected that Han Wangxin was secretly communicating with the Xiongnu, and issued an edict to reproach him. Han Wangxin was worried about being held accountable and punished, so he simply surrendered to the Xiongnu in the land of Mayi. Subsequently, Han Wangxin and the Xiongnu waved their troops south, entered Yanmen Pass, and captured Taiyuan County. Poor princes and grandsons, and princes of one side have become accomplices of foreign races for their own selfish interests.

In the winter of 200 BC, Liu Bang personally led an army of 320,000 troops to fight against the Xiongnu and at the same time suppressed the rebellion of Han Wangxin. Before leaving, Liu Bang selected Chen Ping as his staff officer. It was this decision that saved Liu Bang and changed the course of history.

The Han army defeated Han Wangxin at Tongba (Qin County, Shanxi), and Han Wangxin fled to the Xiongnu. Han Wangxin's subordinate Wang Huang and others gathered the remnants of the defeated army, supported Zhao Li as king, and continued to unite the Xiongnu against the Han army. Mao Dunshan sent the left and right Xianwang each with more than 10,000 cavalry and Wang Huang and other tun troops near Jinyang, in an attempt to block the Han army from moving north. The Han army pursued the victory, broke through the Xiongnu Jinyang defense line, won three battles and three victories, and the front of the army was directed at the station of Maodun Shan in Daigu (the area of Fanzhi County, Shanxi).

The Han army won victories one after another, and the troops developed the mentality of underestimating the enemy. Liu Bang was still very cautious at this time, and he successively sent more than ten groups of envoys to visit the Xiongnu, and used the name of the visit to explore the reality of the Xiongnu.

When the envoys saw that the soldiers in the Xiongnu camp were old, old and small, cattle and sheep were scarce, and the military horses were thin, they all came back and told Liu Bang that the Xiongnu could fight. Liu Bang was overjoyed and ordered the main force of 200,000 to rush out of Yanmen Pass to the front line.

Liu Bang was still not completely relieved, and sent envoys to the Xiongnu for the last time. The envoy's name was Liu Jing, that is, the aforementioned Lou Jing, and after his suggestion to set the capital of Guanzhong was adopted, Liu Bang gave him the surname Liu and named Langzhong. This time to attack the Xiongnu, Liu Bang also brought him.

The world is unpredictable. Liu Jing came back and reported: "When the two countries fight each other, according to common sense, they will show off and show off their strength. When I arrived at the Xiongnu, I only saw inferior horses, thin cattle and old and weak soldiers, which must have been deliberately shown weakness by the Huns, wanting to ambush the strange soldiers to win. I don't think the Huns can fight. ”

Liu Bang was anxious to defeat the Xiongnu and remove the threat from the northern border, Liu Jing's advice was so unpleasant, he scolded: "Qi State cowardice!" With one mouth, he grabbed an official, and now he dares to talk nonsense and disturb the morale of the army! He immediately ordered Liu Jing to be arrested and imprisoned in Guangwu County (Dai County, Shanxi), and then dealt with when he returned from victory.

Liu Bang led the light cavalry to Pingcheng (Datong, Shanxi) first, and the main force of the Han army had not yet arrived. Mao Dunshan saw that the Han army had taken the bait and set up an ambush on Baishan Mountain (Datong Mapu Mountain).

Liu Jing's judgment is very accurate! Every time the Han envoys came, the Huns hid the elite soldiers and fat livestock to show an illusion.

As soon as Liu Bang's cavalry entered the encirclement, Mao Dunshan immediately commanded an army of 400,000 Huns and besieged Liu Bang's soldiers and horses in Baishan Mountain.

White Mountain, the name of the mountain is full of evil spirit.

The Han army had no food and grass inside, and no reinforcements outside. Liu Bang organized a breakthrough, and after several fierce battles, he failed to open a breakthrough. Mao Dun Shan Yu led the cavalry to besiege the Han army from all sides, the Hun cavalry in the west was all white horses, the east was all green horses, the north was black horses, and the south was red horses. Relying on its geographical advantages, the Han army resisted stubbornly, and the battle situation was stalemate. The Xiongnu besieged it for seven days and seven nights, but did not capture Baishan Mountain.

It was the middle of winter, the climate was very cold, and the Han army was running out of food, so it was really hungry and cold. The situation is extremely dire. Liu Bang's intestines are about to repent.

Chen Ping, the conspirator, once again played a big role. Mao Dun Shan Yu newly married the Yan family (princess), it was the time when the feelings were blazing, this time to send troops, Mao Dun brought a new wife, the two rode horses together and went in and out together, often taking advantage of the time between the war to show a love and bask in happiness. Chen Ping got this information from the sentry sergeant, used his brains, and made up his mind on the Yan family.

Liu Bang adopted Chen Ping's strategy and sent envoys down the mountain in the thick fog to present many gold, silver and jewels to the Yan clan, and it is said that he also brought a painting.

There is no woman who doesn't like jewelry, and she is happy. The envoy also said that the Han Dynasty wanted to offer a beautiful woman to Shan Yu, and this time the troops were in a hurry, and the beauty did not accompany him, so he sent the portrait of the beauty first.

When she heard that the beauty was unhappy, she opened the scroll and saw that the beauty in the painting was indeed very beautiful, and she was even more nervous, so she hurriedly said, "I'll keep the things." Go back and tell you the emperor, I'll intercede with Shan Yu. Don't send beautiful women, and don't show the portrait to Shan Yu. ”

That night, the Yan clan said to Mao Dunshan Yu: "The army has received news that hundreds of thousands of reinforcements from the Han Dynasty are coming, and I am afraid that they will arrive tomorrow." ”

Maudun was taken aback and asked, "Is there such a thing?" ”

"Han and Hungary shouldn't be persecuting each other too much, now that their emperor is trapped in the mountains, how can the Han people give up?" Naturally, they will desperately save it. Even if you defeat the Han people, we Huns are not willing to live in the south for a long time. As soon as the Han army's rescue arrived, we attacked inside and outside, and if we couldn't win, we wouldn't be able to stay together for a long time. ”

Mao suddenly felt his heart crisp and asked, "What should I do then?" ”

Yan struck while the iron was hot and said: "The Han Emperor has been surrounded for seven days and is fine, presumably there must be gods to help." Why should you disobey the Mandate of Heaven? It's better to let him live, and it can be regarded as accumulating virtue for the two of us. ”

Mao Dunshan originally agreed with Zhao Li and Wang Huang on the date of the meeting, but the army of the two traitors did not come on time. Mao Dun suspected that they were colluding with the Han army, so he listened to the words of the Yan clan, opened the encirclement, and let the Han army withdraw.

Early that morning, fog was thick. Chen Ping suggested that the soldiers should be unsheathed and their arrows wound up, so as to slowly retreat in a state of readiness. Wait for the troops to completely get out of Baishan Mountain, and then march quickly all the way south to join the main army.

Liu Bang killed more than a dozen envoys who had reported that the Xiongnu could fight and pardoned Liu Jing. Liu Bang apologized to Liu Jing in person and named Liu Jing as a letter candidate. It is rare in history for an emperor to admit his mistakes to his ministers.

Truly confident people dare to admit their mistakes. Liu Bang's heart is too strong!

Liu Bang is not afraid of losing face, and Liu Jing reciprocated him with loyalty. In order to guard against the Xiongnu, Liu Jing suggested that the descendants of the nobles of the Six Kingdoms should be moved to settle in Guanzhong, so as to increase the population density around the capital and facilitate the control of the remnants of the Six Kingdoms.

In 198 B.C., Liu Bang issued an edict to move more than 100,000 people from the Tian, Qu, Jing, Zhao and Huai clans of Qi and Chu to Guanzhong, and the imperial court allocated land and houses.

Liu Bang realized the strength of the Xiongnu, and once the war started, the Han had no certainty of winning. In order to recuperate, Liu Bang adopted Liu Jing's suggestion to marry Princess Lu Yuan and make peace with the Xiongnu.

Empress Lu was born only to Princess Lu Yuan and the crown prince Liu Ying, Empress Lu rarely showed warmth, she refused to agree, and cried from morning to night every day.

Liu Bang could only find a girl from the clan surnamed Liu to be named a princess and marry Mao Dunshan Yu. The poor girl fell victim!

In addition, the Han Dynasty sent large quantities of cotton, silk, grain and wine to the Xiongnu every year. The Han and Xiongnu agreed to become brothers, with the Great Wall as the boundary, and bilateral relations were temporarily eased.

After decades of waiting, during the period of Emperor Wu of the Han Dynasty, the Han Dynasty finally beat the Xiongnu all over the ground, which is a later story.