Regarding the Xiongnu, the story that impressed the Han people the most should be called "The Siege of Baideng". At that time, Liu Bang's cold sweat left a strong mark in the history books of Danqing, so that the entire China could not forget the grassland overlord of "400,000 people who controlled the strings" for two thousand years.

Later, the story of the Xiongnu belonged to Wei Qing, Huo Quzhi, Li Guang, Ban Chao, and the four-hundred-year-old Han Dynasty. The direct consequence of the continuous military action is to divide the Xiongnu into two parts, the north and south, and the two parts attack each other, and there is no peace. Of course, this was for the Huns, but the Han people who were born in the Central Plains lived happily ever after. Later, the story came into the hands of Cao Cao, who was known as "the traitor of the troubled times and the capable minister of the world".

In 215, the great Cao Cao did a great thing, he defeated the Southern Xiongnu and moved all the Southern Xiongnu to Shanxi. And, in order to prevent them from becoming a catastrophe one day, Cao Cao used a trick "Split Plum Blossom Strategy", dividing the Southern Huns into five parts, left, right, south, north and middle, and imprisoning the last generation of Southern Huns in Yecheng (I don't know if Cao Cao led him to Tongquetai).

Although the five Xiongnu tribes formally retained the tribal organization of the Xiongnu, in practice they were placed under the strict and effective control of the Central Plains Dynasty. The 400-year war of killing and looting each other also means that the two nations have a deep hatred for 400 years.

At the time, this was a great and wise feat!

Finally overthrew the Huns, and when Cao Cao finished all this, the excitement in his heart was beyond words. What the wise and martial Emperor Wu of the Han Dynasty did not do in his life, Cao Cao did. However, decades later, when the control of the Huns was no longer as strong as ever, or even virtually nonexistent, trouble ensued. These Huns no longer had to climb over the mountains and cross the Great Wall, and their cavalry galloped directly across the plain plains. No one can stop them from coming and going like the wind.

However, we really can't blame Cao Cao, in that era, he had done the best he could.

In fact, there are still Southern Huns who have not moved inward.

The nomadic yearning for immortality made the Huns who refused to move inward hold the whips in their hands, and they continued to ride horses and graze together with the Northern Huns, galloping around the vast grasslands. But soon the grassland changed its owner called "Xianbei", and there was no place for them anymore.

I had to find another place to live, but Cao Cao refused to accept it again: since you don't want to move inward, then never move inward.

The only road left for the Huns was to go west, west, and west again until the end of the west.

The westward migration of the Xiongnu actually began in the early Eastern Han Dynasty, a walk is two hundred years, under the influence of Cao Cao's policy to go the most thorough, they have been to the Danube and the Rhine, they will encounter the most barbaric species in Europe - the Germans, and defeat this group of Germanic barbarians, expelled them into the territory of the Roman Empire, these Germanic people who fled by the Huns eventually led to the collapse of the Roman Empire. So, the Europeans gave this group of Huns who migrated westward a resounding name - the whip of God.

While the Huns were sweeping across Europe, the same miracle was being performed in the East by those who remained of their countrymen, a miracle that the Huns had never had, even in their most powerful era! The one who led them to do all this was a Hun named Liu Yuan.

It is not for nothing that Liu Yuan was able to do all this, the Rebellion of the Eight Kings made the whole of China like a pot of porridge, and hundreds of thousands of Jin troops killed each other in the vast Central Plains at every turn. Years of war have left the entire Jin Empire in ruins, and the severe infighting has exhausted almost all the strength of the country, and there is no longer time to take care of the ethnic minorities who have migrated inward, and in many cases, they want to use their strength to pursue their own selfish desires. Liu Yuan took advantage of this opportunity to blow the horn of the Huns' attack again. And, out of control.