Idioms abound, and the northern border has been harassed by Xiongnu. Only when Princess Luyuan marries Mao Dun can she get out of trouble.

During the Qin Dynasty, Qin Shihuang sent general Meng Tian to lead 300,000 troops to the northern expedition to the Huns and recover the Hetao area. At the same time, the Great Wall was built to prevent the Huns from going south. From the peasant uprising at the end of Qin Dynasty to the dispute between Chu and Han, people who have been guarding the frontier have been absent without leave because of the years of war in the Central Plains. Without borders, the Huns took the opportunity to go south. At the height of the fierce battle between Liu Bang and Xiang Yu, Mao Dun Khan, the leader of Xiongnu, had crossed the Yellow River, unified the northern grassland and established a political institution by setting up official positions. At the same time, his troops have gradually improved, with more than 300,000 soldiers.

With such great strength, the Huns naturally forgot the strength of Meng Tian's 300,000-strong army in the Qin Dynasty and rekindled their ambition to invade the Central Plains. Especially after Han Wangxin surrendered to the Huns, he learned more about the situation of the Han Dynasty, felt more at ease, boldly wrote down the mountains of South Vietnam, headed for Taiyuan County, and arrived at Jinyang Gate.

In the winter of 200 BC, Liu Bang led 320,000 troops to the north to meet the Xiongnu. Beat Han Wangxin with a brass cymbal and kill his general Wang Xi. Fled to the Huns, the Ministry sent descendants of Zhao, King Bai Tuman, Qiu Chen, and others to collect down archers and make a comeback, and then attacked the Han army with Mao Dun Khan. With a lesson from the past, the Huns decided not to confront the Han army head-on, and sent more than 10,000 cavalry and Wang Huang to bypass Wang Xian and station in the south of Guangwu. When I arrived in Jinyang, I fought with the Han army and was defeated. The Han army pursued Lishi and lost again. Subsequently, the Huns reorganized their troops in the northwest of Loufan, and then thought of a trick to retreat and lure the Han army.

Before and after Liu Bang sent more than ten people to inquire about the situation and see if there was an ambush. After coming back, a dozen people reported that they had really retreated and could pursue them, but Liu Jing thought the Huns cheated. Liu Jing was an emissary of the Huns, not an intelligence agent who went to the front to inquire about the situation. Therefore, Liu Bang disagreed and led some troops from Jincheng to Pingcheng. Before that, the Han army had never confronted the Huns head-on, and of course they were not familiar with their tactics, so they were cheated.

Rush Khan ambushed 400,000 cavalry in this area. As soon as the vanguard troops led by Liu Bang arrived in Pingcheng, they rashly issued an attack order to the whole army. Seeing the sudden appearance of the enemy, Liu Bang was surprised and immediately deployed Deng Baishan to the east of Pingcheng to meet the enemy. The Xiongnu army soon surrounded the whole mountain. It's snowing, and God seems to be torturing the Han army. The food ran out, and twenty-three of the ten soldiers lost their fingers due to frostbite.

Surrounded by Liu Bang and tarquin, and without the support of shops, the situation is extremely dangerous. At this time, the transshipment households presented gifts in Khan's main room, fanning the flames and saying that Emperor Han presented beauty to Khan. Afraid of falling out of favor, E Shi told Mao Dun that Emperor Wu of the Han Dynasty was blessed by gods, and the land of the Han Dynasty was not suitable for Huns to live in. Morton had already made an appointment with the Ministry, but Wang He and Zhao didn't come. Mao Dun also suspected that the Han army had other designs, so he listened to E Shi and pulled out a corner of the encirclement, and Liu Bangcai was able to get away. Morton left with 400,000 elite cavalry, and Liu Bang led the army to retreat. After Liu Bang fled, he apologized first and sealed 2,000 households.

After the siege of Deng, he fled back to Xiongnu. At that time, Khan was strong, and Liu Bang was too concerned about this issue to sleep. One day, Liu Bang asked Liu Jing to find a way. Liu Jing said: "At present, the world is stable and successful.

"If your majesty can marry big princess to Morton Khan and give him a heavy gift, they know that Emperor Han Xian married big princess and got a gift, which will definitely make her a E Shi. E Shi, as Khan's wife, must become a prince after giving birth to her son and inherit his throne in the future. This reckless greed for the generous gifts that your Majesty gave on time every year in the Han Dynasty was superfluous in the Han Dynasty. At the same time, he took this opportunity to send someone to tell them some manners. In this way, whether you are dead or not, your majesty will never be troubled by this problem again. "

Liu Bang felt very good after hearing this idea, and immediately decided to marry Princess Lv Yuan to Mao Dun. Lv Hou quit, cried twice and quarreled three times, and then hanged himself. Finally, he had to recognize a royal girl as a princess, pretending to be Princess Luyuan, and was escorted by Liu Jing to the Xiongnu to marry him.

There is no record in history of who replaced the real Princess Luyuan, but it is not hard to imagine that this fake Princess Luyuan and Liu Jing risked their heads to go to Xiongnu. Once the identity of the fake princess is exposed, both of them are in danger. However, Mao Dun doesn't seem to care much about blood. Perhaps the beauty and talent of the princess moved him. Since then, Mao Dun has never launched a major military action against the Han Dynasty. But according to historical records, only Mao Dun married the seven princesses of the Han Dynasty. From this perspective, I really like Korean princesses. Of course, it may also be because of the princess's dowry. Due to the unstable local economic income of Xiongnu, the dowry and subsequent trade income of marrying the princess in Han Dynasty were considerable.

After returning from Xiongnu, Liu Jing said to Liu Bang, "Aries and Loufan in Henan, Xiongnu is only seven hundred miles away from Chang 'an. Light cavalry can reach Guanzhong in just one day and one night. Guanzhong has been devastated by war in recent years, with few residents, and fertile land can be enriched by immigrants. At the beginning, the princes opposed Qin. If it weren't for the imperial clan field and the Qu and Jing of Chu, who would dare to provoke? Now, although your majesty has its capital in Guanzhong, there are actually very few people in Guanzhong. The north is close to the invasion of the Hu people, and there are six nobles in the east. Their clan is very powerful, and once something happens, your majesty can't sit back and relax. I hope your majesty will move Zhao, Qu and Jing of Qi, Yan, Zhao, Han and Wei of Chu, and the descendants of famous ministers and heroes in Shandong to Guanzhong. There is nothing in the world, so you can guard against the invasion of the conference semifinals; The change of rulers is enough to lead to their rebellion in the east. This is a strong and weak strategy. "

Liu Bang agreed to Liu Jing's suggestion, and moved the descendants of the imperial clan and dignitaries of the six Shandong countries to Guanzhong. In the early Western Han Dynasty, the northern border was invaded by Xiongnu. The central government of the Western Han Dynasty has always pursued the policy of "pro-intimacy" and strived for border peace through compromise. It was not until Emperor Liu Che of the Han Dynasty that this pattern was broken.