Briefly describe the relationship between Han and Xiongnu, and ask God for help.

During the Qin and Han Dynasties, with the development of social economy, the Huns had established a powerful slavery regime. Xiongnu Mao Dun Khan took advantage of the struggle between Chu and Han to break the East Lake, attack Yueshi in the west, levy Dingling, Jiankun and other departments (in today's Mongolia to Siberia), destroy Loufan and Aries in the south (in today's southern Inner Mongolia), and control the vast areas of North China, Northeast China and Northwest China, with more than 300,000 cavalry, which is very powerful. With the formation and development of slavery, the state institutions of Xiongnu became more and more perfect. The supreme leader is Shan Yu. Under Shan Yu, there are Tuqin's left and right kings (that is, left and right wise kings), Guli's left and right kings, left and right generals, and left and right commanders. These big noble all commanded the army, riding more than 10,000, but less than 1,000. There are also officers at all levels under big noble; Political affairs are handled by Xiao Wang, Xiang, Feng, Danghu and others. These positions were inherited by nobles. Khan also divided the national territory into three parts, the left king Tuqin ruled the east, Khan ruled the middle directly, and the right king Tuqin ruled the west. Xiongnu nobles often invaded the northern part of the Western Han Dynasty in order to plunder slaves and property. In 20 1 year BC (the sixth year of Han Dynasty), Mao Dun Khan sent troops to besiege Mayi, Han Wangxin surrendered, and attacked Jinyang (Taiyuan City, Shanxi Province) the following year. When Emperor Gaozu heard the news, he led 300,000 troops and was besieged by Xiongnu in Dengbai Mountain, Pingcheng (southeast of Datong, Shanxi). Later, Chen Pingji bribed Khan E Shi to escape. History is called "the siege of the city of peace". At the beginning of the Han Dynasty, due to the urgent need to restore the economy and the fact that the political power had not been consolidated, Emperor Gaozu had to adopt the method of "pro-marriage", married the Han master to Shan Yu, and sent a lot of silk, food, wine and so on every year. However, the democratic policy could not stop the Huns from plundering. BC 166 (14th year of Emperor Wendi), Xiongnu Lao Shang Khan led 140,000 cavalry, attacked and killed the governor of Beidi County (near the county governing Guyuan), and the vanguard troops arrived in Yong (Fengxiang, Shaanxi) and Ganquan (Chunhua, Shaanxi) and burned back to the palace. Eight years later, the Huns invaded 30,000 riders from Yun Yun (Togtoh Banner, Inner Mongolia) and the monk army (near Yubao, south of Yulin, Shaanxi), and Chang 'an City was frequently disturbed. During the Wenjing period, although the pro-Xiongnu policy was adopted, some preventive measures were taken to resist the invasion of Xiongnu. For example, Wendi reformed the rotation system of border guards and immigrated to the "real border" through tax exemption, knighthood and atonement. He also strongly advocated raising horses and prepared to fight back against the Huns. After Emperor Wu of the Han Dynasty ascended the throne, due to the great strengthening of centralization, the country's economic strength was unprecedented, and the conditions for countering the Xiongnu were completely mature. During the period of Emperor Wu of the Han Dynasty, the war against Xiongnu was mainly from 133 BC (the second year of Yuanguang) to10/9 BC (the fourth year of Yuanshou), and more than a dozen battles were fought successively, including three decisive battles. The first battle took place in 127 BC (the second year of yuan Shuo). This year, the Huns invaded Shanggu and Yuyang (Miyun County, Beijing). Emperor Wu of the Han Dynasty sent General Wei Qing and General Li Xi to lead the troops out of the cloud to launch a surprise attack on Hetao and the Xiongnu army south of it, and the Xiongnu Aries King fled. The Western Han Dynasty completely recovered Henan and relieved the Xiongnu's threat to Chang 'an. The Western Han Dynasty established Shuofang County (Hangjinqi, Inner Mongolia) and Wuyuan County (Wuyuan, Inner Mongolia) here. The second battle was in BC 12 1 year (the second year of Yuanshou). Emperor Wu of the Han Dynasty sent Huo Qubing out of Longxi, crossed Yanqi Mountain (Rouge Mountain in the southeast of Shandan County, Gansu Province) to the west, and entered the territory of Xiongnu for more than 1,000 miles, where he fought hand-to-hand with the Xiongnu army and won a great victory. In the summer of the same year, Huo Qubing's second Western Expedition crossed Yanze (Juyanhai, Inner Mongolia) and attacked Qilian Mountain, which greatly wiped out the Xiongnu army, and the Xiongnu nobles in Hexi suffered heavy losses. In the same year, the Xiongnu nobles split internally, and the evil king of Xiongnu led 40 thousand people to surrender to the Han Dynasty. After this campaign, Han established four counties, Wuwei, Jiuquan, Zhangye and Dunhuang, which were called "Hexi Four Counties" in history. Since then, the road of communication between Han and the western regions has been opened. The third battle took place in 1 19 BC (the fourth year of yuanshou). In order to completely defeat the Huns, Emperor Wu of the Han Dynasty called the generals to discuss and decided to go deep into Mobei and fight back against the Huns. This year, General Wei Qing and General Huo Qubing, a title of generals in ancient times, led hundreds of cavalry and marched in two ways. In view of the wrong judgment of Xiongnu nobles that the Han army could not go on an expedition, the Western Han Dynasty adopted the tactics of attacking and chasing. The marked army led by Wei Qing, starting from Dingxiang, crossed the desert and traveled thousands of miles to the north, surrounded the Xiongnu Khan army. After fierce fighting, Xiongnu Khan led hundreds of riders to break through and fled, and the main force was wiped out. The Han army chased Zhao Xincheng (at the foot of the Han Gai Mountain in Mongolia). Huo Qubing's East Route Army sent troops from Dai Jun (Yuxian county, Hebei province), traveled more than 2,000 miles, crossed the desert, fought against Xiongnu Left, defeated his opponent and returned home in triumph. After this war, the Huns were too weakened to go south on a large scale. Emperor Wu of the Han Dynasty won a decisive victory in the Xiongnu War, stopped the brutal plunder of Xiongnu nobles, protected the development of feudal economy, further developed the northern frontier, and facilitated the traffic between Han and the western regions. With the weakening of the military power of the Xiongnu nobles, the struggle of the Xiongnu and other enslaved people of all ethnic groups against the Xiongnu nobles has become increasingly fierce. In this case, the Xiongnu ruling group clashed. During the reign of Zhao Di, there was an event of five khans fighting for independence, which was later divided into two parts: the north and the south. In 5 1 year BC (the third year of Ganlu), Uhaanyehe, a southern Xiongnu, surrendered to the Han Dynasty, and Khan, a branch of the northern Xiongnu, was forced to move westward and was later killed by the Western Han Dynasty. With the help of the Han Dynasty, Uhaanyehe reunited the Huns. In 33 BC (the first year of Jingning), Emperor Yuan of Han Dynasty married as an imperial envoy (Zhaojun), ending the armed conflict between Han and Hungary for more than a hundred years. About half a century later, there was a scene of peace on the northern border. In recent years, the words "Khan Qin" have been unearthed in the tombs of the late Han Dynasty in Baotou and other places, which is a powerful proof of the improvement of Sino-Hungarian relations. The Eastern Han Dynasty seized the opportunity that the Xiongnu suffered from natural disasters and internal divisions, and joined hands with the northern nationalities such as the Southern Xiongnu, and defeated the flexible, tenacious and tactical northern tarquin with the tactics of long-range attack, divide and rule, encirclement before the annihilation war, and hot pursuit, thus defending the peace of the northern border counties of the Eastern Han Dynasty. When the southern Xiongnu was annexed, the strength of the northern Xiongnu was greatly reduced, and it was far from the north of the desert, the Eastern Han Dynasty still pursued it. Although the Xiongnu regime in the north was eliminated, it provided favorable conditions for the development of Xianbei and became a new frontier disaster in the Eastern Han Dynasty.

Satisfied, please adopt.