With Bu Shitu Taiji and his Mongolian tribes withdrawing from the Hetao area, and all the tribes of Susang Taiji became part of the Ming Dynasty, the entire Hetao area was completely included in the Ming Dynasty, and the task of post-war reconstruction fell to Yuan Yingtai.

But it is said that Lin Dan Khan of the Chahar tribe has a bad feeling from his heart since he knew that the Horqin Mongol tribe was friendly with the Ming Dynasty, and always felt that the Ming Dynasty would attack him, and the Tumut tribe harassed the Yansui region of the Ming Dynasty, Lin Dan Khan naturally knew what the reason was, at the beginning he thought that his plan was extremely wise, but what he didn't expect was that the Ming Dynasty army's response was so rapid, and it took less than two months to quell the harassment of Sunang Taiji, and captured the tribes that had recovered Sunantai Gi. In the next step, he drove away the entire Tumut tribe of Bu Shitu Taiji with lightning speed, especially when he heard that a 10,000 households of Bu Shitu Taiji was defeated by Lu Xiangsheng's 1,000 households in less than an hour, which made Lin Dan Khan tremble, that is ten times the strength of the army, and it can't even be stopped for an hour, when did the army of the Ming Dynasty have such a strong combat effectiveness?

With the retreat of the Tumut tribe, the right flank of the Chahar tribe has been completely exposed to the Ming Dynasty's troops, and the Ming army can launch an attack on him from the east, south, and west at any time. The big Etoks began to hook up with the Ming Dynasty, and the small Etoks did not dare to make blatant contacts, but they also privately began to send people to contact the exchange of goods. All these unusual things made Lin Danhan very uneasy, in fact, he didn't expect that these things were caused by his own reasons.

The Chahar tribe is the most famous tribe of the Mongolian people, known as the central Mongolian Wanhu in history, and was a direct tribe of the Mongolian Great Khan in the Northern Yuan Dynasty. The lords of each of the Otoks have traditionally been inherited by the descendants of the eldest son of Dayan Khan, the "Golden Family", Tulu Borot, and the sixth son, Hanzir Berrot. They belong to the lineage of the Central Mongolian Khan and the "Golden Family", the elite part of the elite.

Since the Yuan Dynasty withdrew from the Central Plains, the Northern Yuan Dynasty regime has restarted operation on both sides of the desert, and has been at war with the Ming Dynasty for nearly two hundred years, but the characteristics of the nomads have made them unable to maintain a strong war ability, and every time a generation of Khan kings dies, it will cause internal rights disputes, and now the centripetal force of the Central Khan Court and the "Golden Family" against the tribe is getting weaker and weaker, and there are more and more contradictions, and the ability to fight with the Ming Dynasty army has basically been lost. In less than ten years of history, they were divided and subdued by the Later Jin regime, lost their qualifications to independently rule the north and south of the desert, and became vassals of the Later Jin regime.

Lin Danhan thought about what method to use to strengthen the self-reliant forces and regain the ability to fight against the Ming Dynasty, so as not to be driven out of the north and south of the desert like Bu Shitu Taiji. Just when Lin Dan Khan's mind was a little distended, there was good news that the envoy from the Nurhachi faction arrived. Lin Dan Khan pretended to be cold and exposed the envoy for two days, which was because the Nurhachi tribe was disrespectful to himself before, but when the envoy handed over Nurhachi's letter, Lin Dan Khan could no longer be reserved.

Nurhachi told Lin Dan Khan in the letter that the current Ming Dynasty is much stronger than before, in order to ensure that we are not destroyed by the Ming Dynasty, we must unite and attack the army facing the Ming Dynasty from the east and west, once we succeed, we can divide the vast territory of Liaodong equally, and even go south to re-destroy the Ming Dynasty and revive the prosperity of the Yuan Dynasty. At that time, you, Lin Dan Khan, will be the new generation of Great Khan recreated by the Mongols.

After reading Nurhachi's letter, Lin Dan Khan was extremely excited at first, and his ambition was ignited again, as if the Beijing city of the Ming Dynasty had once again become the Kyoto of the Great Yuan Dynasty, and he had become the Great Khan of the whole world. But when he calmed down and took stock of his strength, his psychological face was half cold, looking at the scattered Etoks, Lin Danhan really didn't feel a good feeling in his heart. For the sake of his future, Lin Dan Khan decided to gather all the Etok chieftains to discuss.

When Lin Dan Khan took out Nurhachi's letter for everyone to take turns to watch, and then asked everyone's opinions, the big tent was immediately like boiling water in a pot, and the argument sounded. The 30,000 households on the left and right flanks of Chahar knew very well the strength of the Ming army, especially the 10,000 households on the right flank, and some people in his tribe had seen the firearms of the Ming army, and they had also seen the fierceness of the Hetao light cavalry. Therefore, the 30,000 households on the left and right wings resolutely oppose the fight with the Ming army, not to mention that now the Ming Dynasty has a very large commodity transaction volume with itself, and the tribe is also very comfortable, there is no need to form an alliance with Nurhachi and jointly deal with the Ming Dynasty, plus Nurhachi has been beaten by the Ming army and retreated to the vicinity of the old nest, so he has no ability to unite himself. The 30,000 households in Mobei strongly supported the alliance between Lin Dan Khan and Nurhachi, they had not yet seen the combat effectiveness of the Ming army, and it can be said that they were very ignorant of the Ming army, and only thought about how to restore the glory of the Great Yuan Empire. The outcome of the discussions was pessimistic, with most of the Etoks not in favor of an alliance with Nurhachi, but were willing to maintain the status quo with the Ming Dynasty.

Not to mention that Lin Dan Khan was very disappointed, but said that the leader of the 30,000 households on the right wing of Chahar was very disappointed in Lin Dan Khan's ability, thinking that there was something wrong with his vision, and he would not make friends with the powerful Ming Dynasty, but he wanted to unite with Nurhachi to provoke the Ming Dynasty army, you want to die early and live early, but I haven't enjoyed it enough! The leader of the right wing is called Jaw Mu Buchu Huer, this guy took refuge in Huang Taiji early in history, but the end was not good, and Sun Tzu rebelled and was killed by Emperor Kangxi. After returning to the territory, he discussed with his leaders how to protect themselves, and jointly decided to report to Yuan Chonghuan, who was closest to them.

After Zhu Youxiao learned the information, he immediately ordered Yuan Chonghuan to quickly send troops to intercept the Mobei Mongolian troops, and at the same time let the Oba of Horqin Mongolia send Sun Chuanting to lead his subordinates to expel Lin Dan Khan's central 10,000 households from the Baicheng area, and then let the left and right 30,000 households follow them to occupy the pastures and pastures in these areas, give up their current pastures and pastures, and then immigrate from Shaanxi and Shanxi, so that the water and soil environment can be maintained there, and the grass is cut and cultivated here, and a small amount of land is cultivated.

When Lin Dan Khan found out that the Ming army had begun to move, he felt that something was wrong, especially the unusual behavior of the 30,000 households on the right wing of Chahar, which made him even more worried. Therefore, Lin Dan Khan also took action as soon as possible, and 30,000 households in Mobei Mongolia dispatched 50,000 cavalry to meet his northwest direction and take vigilance measures against the Horqin Mongol tribes. But all these actions were simply vulnerable in the face of the great strength of the Ming army. The Mongol cavalry in Mobei began to retreat in less than half an hour after the confrontation with Yuan Chonghuan's infantry, and Lu Xiangsheng's ferocious pursuit made the Mongolian cavalry, known as the most mobile, even more overwhelming. After hearing about the fiasco of Mobei Mongolia, Lin Dan Khan's central 30,000 households did not dare to stay at all, and quickly evacuated Baicheng before Sun Chuanting's troops arrived, and fled to Mobei Mongolia.