Reason:
Gai Suwen made an insurrection in Liaodong, and Li Shimin Taizong personally expedition. As a result, in the battle of Phoenix Mountain, Gai Suwen beheaded Qi first, and then split Yin Kaishan with a knife, resulting in Wagang sending 27 company commanders. Gai Suwen was at a loss and released The Lancet, killing all 27 company commanders. After this battle, Gai Suwen killed almost all the heroes of the crock.
The experience of expanding information Gai Su-wen;
Gai Su-wen was ambitious and arrogant. He robbed the three treasures that Qi did not pay tribute to, and tattooed the envoy's face, saying, "Give them to my son", which aroused great anger and ordered an army to conquer the East.
When Tang Jun crossed the sea, Xue, the pioneer fire army, captured the pass and reached the front of the Phoenix Mountain invincible. Su Wen, a beggar gang, heard the news and left Sanjiang for Phoenix Mountain to face Tang Jun.
Li Shimin went to Phoenix Mountain to see the Phoenix, but he was surrounded by Su Wen's army. Veteran Yin Kaishan and Duan went down the mountain to break through. As a result, they were all killed by beggars' gangs, and Qi, the hero, was also killed.
Twenty-six blood brothers in Wagangzhai were filled with indignation when they saw Qi's death. They went down the mountain for revenge and fought around Gai Suwen.
Gai Suwen couldn't resist the enemy, so he let go of the flying knife. Twenty-six brothers were either smashed to pieces or fell off their horses and died. They were all killed. In this battle, Gai Suwen killed almost all the Waqiu and became famous all over the world for a while.
When he saw that the emperor was besieged, he invited Xue to break the enemy. Xue broke into the tight encirclement and intersected with the beggars' sect. After more than a hundred battles, he pulled out the white tiger whip, beat the beggar's mouth with a saddle and vomited blood, and fled in a hurry.
Gai Su-wen was defeated by Xue, fled back to Sanjiang and Hucheng, set up an empty city to lure the enemy, and earned Tang Jun to enter the city and surround it all around. Qin Huaiyu, a teenager, was ordered by his father Qin Qiong to mourn and led the Second Route Army to help Li Shimin.
Qin Huaiyu single-handedly, killed four doors, broke Gai Suwen's flying knife with a funeral stick, and entered the city. Tang Jun fought among himself, and the beggar gang fought with the rotten for forty rounds. They are no rivals, so they quit the encirclement. Because of heavy losses, they had to go to Fuyu to borrow soldiers.
While traveling and hunting outside Li Shimin, Su Wen, a beggar, borrowed soldiers and was hunted down. Thanks to Xue's rescue, he finally got his dream minister and ordered Xue to take Motianling. Gai Suwen borrowed soldiers to come back, and after Xue left, he surrounded Sanjiang and Hucheng.
Cheng made Gai Suwen break through and asked Xue to clear the way. Gai Suwen still refused to admit defeat and borrowed soldiers for the second time in an attempt to make a comeback. Xue put down the dragon gate array and led beggars' gangs to attack.
Gai Su-wen didn't know this array, and all the soldiers and horses were destroyed, so he fled alone. Xue was ordered to kill him until he reached the seaside. When Gai Suwen saw that there was no way forward, he had to commit suicide with a copper knife and offer his head.
References:
Baidu encyclopedia-biography of Tang dynasty