But this time, Li Shimin failed to bring the leader of the enemy army back to Chang'an, let Li Yuan meet him, count his crimes, and then according to his hobbies, drag people to the downtown of Chang'an and behead him.

Because, the leader of the enemy army, Liu Heimin, fled.

After Liu Heimin and Fan Yuan fled to the Turks with more than 1,000 people, they revived half a year later, borrowed the Turkic soldiers and horses, and attacked back again, which was very dramatic, and Li Shimin finally settled down the territory, and in the next few months, it was occupied by Liu Heimin for himself.

Li Yuan really had his lungs exploding, and he had to spend troops to clean up this stinky stone that seemed to be unbeatable and burning, he sent his fourth son Li Yuanji to conquer Liu Heimin, the situation was not very optimistic, when he fell into deep thought, the prince Li Jiancheng took the initiative to ask Ying to clean up Liu Heimin.

Li Jiancheng's initiative was completely Wei Zheng's idea. He thought that Li Shimin's military achievements were too great, and naturally the people in the court obeyed him, and they were willing to follow him physically and mentally, and there were more people loyal to him, which would threaten his status as the crown prince. If he leads the army and completely cleans up Liu Heimin, it will be of great benefit to stabilize his position.

Moreover, Wei Zheng and the crown prince Li Jiancheng analyzed the situation: Li Jiancheng cleaned up Liu Heimin, it was very easy, after the last time Li Shimin beat Liu Heimin and fled to the Turks, Dou Jiande's old department, that is, the group of people who responded to Liu Heimin, has been almost cleaned up by Li Shimin, this time he came back from the counterattack, and the support he received will be limited, and after the first battle, his old troops were lost, and it was only a matter of time before he beat Liu Heimin.

Li Jiancheng's self-recommendation made Li Yuan's heart bloom, this was exactly what he wanted, and he didn't want Li Shimin's merits to be too big and threaten Li Jiancheng's position as the crown prince. Li Jiancheng is the son-in-law, and it is natural for him to be the prince, and he does not want the prince to move and affect the regime of the Tang family.

In this way, Li Jiancheng embarked on the road of destroying Liu Heimin, replacing Li Yuanji sent by Li Yuan before, and officially crusading against Liu Heimin.

On December 21 of the fifth year of Wude (622), Liu Heimin and Li Jiancheng, Li Yuanji's two brothers' armies fought in Changle (Nanle, Henan), Li Jiancheng seemed to have two brushes in the war, and he was defeated and retreated, so that he bathed in the taste of victory, and felt good like drinking honey: My dignified prince went out to fight, but it was no worse than Li Shimin, who was praised by everyone.

On the 25th, Liu Heimin was beaten by the Tang army in Guantao (now Guantao County, Hebei), but he was not able to resist it, and he was very embarrassed in defeat, and led the team to flee to Maozhou.

Li Jiancheng and Li Yuanji brothers chased to the Yongji Canal opened by Emperor Yang of Sui during his lifetime (referring to the Hebei Road north of the Yellow River and east of Taihang Mountain), the two sides came to a fierce fight, this time Liu Heimin was defeated again, thousands of troops, were cut down in the canal by the soldiers brought by the two brothers, which was originally the main channel for transporting grain in Hebei, and now it is filled with corpses, and the people who transport grain are estimated to have a period of time, do not dare to take this canal, for fear of grievances, fish, shrimp and turtles will not dare to catch and eat, and the war when it is not civilized and uncivilized, It's that cruel.

Liu Heimin ran away heartbroken again, although the posture of running away was not handsome at all, but there was no way to run, he was caught by those two brave brothers, and he must have chopped him up immediately.

Li Jiancheng sent Liu Hongji to chase after ......

Liu Heimin really ran too fast, Liu Hongji chased all the way, and finally collapsed tiredly, so he didn't chase anymore.