About 27 years before the dynasty, when the Central Plains was in turmoil, in the grasslands and deserts in the north, there were Menghu, Xianrong, Turkic, Xiongnu and other ethnic groups, constantly competing for land and water and grass, they attacked each other, and it was also more and more intense, among them, Menghu was the strongest, constantly expanding to the east, and annexed many Xianrong territories. Xianrong also continued to expand northward to the east, forcing the Xiongnu to the depths of the desert, and almost annexing the Turks, leaving only the remaining Turkic branches to flee to the easternmost part of the desert to survive.

As a result, in the entire north, there are only two tribes of equal strength, that is, Menghu and Xianrong, and the two families are also in the continuous battle, winning and losing each other, and both are defeated, and they urgently need to recuperate, so the two families have also reached an agreement to take the two current war zones Baishi Mountain as the boundary, and the truce will be repaired.

At that time, the leader of Menghu was already old, and he only had a young grandson under his knees, so he borrowed a donkey from the slope and agreed to a truce with Xianrong.

Soon after the armistice, the leader of Xianrong took the lead in claiming the king, proclaimed himself the king of Xianrong, and set up a royal tent, divided the land into five tents (roughly equivalent to today's military district) and sealed five lords to govern each account.

The leader of Menghu then also proclaimed himself king and proclaimed himself king of Menghu.

Thus, the two great powers of the steppe were formally formed.

The two families reconciled and intermarried.

In that year, King Menghu died of illness, and his young grandson became the heir and became the new King of Menghu.

In the second year, the Xianrong King also relapsed from the old injury, a sickness, and soon drove the crane to the west, because several sons of the Xianrong King were killed in the war for many years, so there was no heir, so, a power struggle within Xianrong began, and the adults of the five tents began to compete for the throne, and finally, the Lord of the West Tent took the lead in leading the army to control the king's tent, and the rest of the adults were not satisfied, and they raised troops to attack.

A civil war began, just in the second year of the founding of Xianrong.

At this time, the previously destroyed Turks revived, and the Xiongnu who fled north also waited for an opportunity.

Xian Rong lost nearly a tent of territory in the blink of an eye.

At this time, the five tents who were inseparable had to stop and deal with foreign enemies.

When the territory was recaptured, the Lord of the Four Tents found that his strength had been greatly consumed, and he was far inferior to the Western Horde, so he was unable to compete for the throne, so he could only have his own thoughts and grit his teeth angrily.

Then at this moment, the Menghu people naturally did not let go of this opportunity, and under the consultation of several old Menghu leaders, Menghu decided to take the opportunity to send troops, intending to take the opportunity to defeat Xianrong in one fell swoop.

Menghu's army crossed the White Stone Mountain in the summer and assaulted the Xianrong West Horde, which was defenseless and directly routed.

The sudden attack shocked the entire Xianrong.

Lord West Horde was forced to retreat to the territory of the Middle Horde.

Menghu also showed no mercy, and his troops attacked in three directions.

At this time, the five tents realized that Xian Rong had gone to the danger of destruction, and they panicked.

At this time, the Lord of the West Tent immediately made a decision, sent a messenger, made peace with the Four Tents, and proposed, in the future, the Five Tents will be governed together, how to govern together? That is, the king's tent is composed of five lords, who make decisions on military and political affairs, preside over state affairs, and are called elders.

This proposal was immediately approved by the Lord of the Four Tents, and then they all said that they should put aside their personal grievances and unite with the outside world, and so on.

In the autumn of the same year, just when Menghu had already captured most of Xianrong's territory, the Xianrong Five Tents coalition army was ...... Gather 200,000 people and start a counteroffensive.

The violent counterattack made Menghu a little overwhelmed, and he kept losing and retreating. Xianrong people took advantage of the victory to pursue, under the leadership of the generals Tuoba Chi, Qihong, and Duo Plating, the Xianrong army drove the Menghu army all the way back to the east of Baishi Mountain, and recovered all the lost territory.

The Xianrong people who suffered a loss naturally would not agree, and insisted on annihilating Menghu in one fell swoop. Then the calm Lord of the West Tent knew that the Xianrong army had also reached the limit, and if it continued to fight, I was afraid that it would be desperately resisted by Menghu, and it would be unpredictable to say that the outcome would be unpredictable, and I was even more afraid that the surrounding small clans would take advantage. So, under his mediation, Xian Rong put forward conditions, demanding that several old leaders of the Menghu royal court be handed over to Xian Rong, and Menghu declared himself a vassal to Xian Rong, provided war horses and forage every year, ceded the territory east of Baishi Mountain, and re-bounded Yabulai Mountain.

There was no way out, and the Menghu royal court was forced to accept this humiliating condition, cede the land and claim the vassals, and submit them to the people.

In the end, the war ended with a complete victory for Xian Rong, who executed the old leader of Menghu, and from then on, the Menghu royal court lost its auxiliary government, and the young Menghu king began to govern himself. At the same time, Menghu also began to decline and collapsed.