The change of Xuanwumen is the pinnacle duel between the crown prince Li Jiancheng and the king of Qin, Li Shimin, it is a bloody cannibalism, and it will never die, but,Before that, the two of them did not happen to the point of life and death, there was only a power struggleHowever, when Li Yuan's balance tilted towards Li Jiancheng, Li Shimin took a bold step.
In the seventh year of Wude, Li Yuan went to the "Renzhi Palace" thirty miles outside Chang'an City to spend the summer, and all the big and small things in the court were handed over to Li Jiancheng, so that he could be a "** emperor", taking advantage of this opportunity, Li Jiancheng did a bold thing and sent a batch of armor to Yang Wengan, the governor of Gyeongju. Yang Wengan was originally Li Jiancheng's guard and confidant, but later Li Jiancheng released him and became the governor of Gyeongju, in the area of Qingyang, Gansu today. Li Jiancheng gave him armor so that he could train a group of samurai in case of emergency. However, this matter is also a big taboo. In ancient times, it was no problem for you to hold a knife and a gun, but you just couldn't hide the armor privately, once you found out, you would be regarded as complicit, so Li Jiancheng would take advantage of Li Yuan's going out to do this, originally he thought that Li Shimin and Li Yuanji had followed their father to Renzhi Palace, and their subordinates were all their own people, and there would be no mistakes. Unexpectedly, this matter was bad for his subordinates. 
The people in charge of escorting this batch of armor are called Er Zhuhuan and Qiao Gongshan, as soon as these two people hit the road, they were bought by Li Shimin, and the task was very simple, that is, to go to Li Yuan to inform. How can this Li Shimin know the news so accurately, is there a mole in the prince's mansion? Yes, Li Shimin had already planted eyeliner in the East Palace, and it was the same person who passed on an important piece of information to Li Shimin before the Xuanwumen Change, which led to the later Xuanwumen Change. And Li Jiancheng wanted to break his head, but he wouldn't have thought that this person would actually be him? Who is he? Let him lurk for a while, it's not the time to reveal his identity. Er Zhuhuan and Qiao Gongshan, according to the predetermined script, went directly to Renzhi Palace, took the initiative to surrender, saying that the prince was going to rebel, let us send armor to Yang Wengan, and then we should cooperate with the outside, we were timid and did not dare to participate, so we hurriedly came to report the news, etc., and said it with added fuel and vinegar. After Li Yuan heard this, he couldn't believe his ears, he didn't know about the prince's private recruitment of soldiers and horses, but it was just a contest between the brothers, if you want to say rebellion, he really didn't have the courage. However, the matter was important, and Li Yuan did not dare to take it lightly, so he hurriedly asked someone to inform Li Jiancheng and quickly came over to explain the situation. At this time, the prince's East Palace was also in chaos, and Li Jiancheng's subordinates had two opinions, one thought that since it was self-defeating, it was better to simply do the opposite, and one thought that things had not yet reached that point, so it was better to take the initiative to see the emperor, explain the situation, and there was a turnaround. In the end, Li Jiancheng adopted the second opinion, and he ran to Renzhi Palace without a single soldier and met Li Yuan. In front of Li Yuan, Li Jiancheng frankly admitted that he did send armor to Yang Wengan, but this is the job of the division, Gyeongju needs to strengthen the defense, and it is normal for me to allocate some armor to him. Li Shimin looked at it from the side, this big move of his own, was resolved by the big brother so easily? No, I've got to add to the fire. 
So, he said to Li Yuan: "Father, whether the eldest brother has rebelled, you can't listen to his words, you have to call Yang Wengan over and confront him face to face." As soon as Li Yuan heard that it made sense, he ordered Yang Wengan to run over as well. Unexpectedly, Yang Wengan's psychological quality was too poor, and as soon as he heard the emperor call him over, he immediately raised troops to rebel. At this time, Li Jiancheng was passive, Li Yuan pointed to his nose and said: "You still said that you didn't rebel, what is Yang Wengan doing." Li Jiancheng is a person who has seen strong winds and waves, and at this time, he still insisted that Yang Wengan rebelled, what does it matter to me, I will send him armor, it is a business matter, and these two things cannot be related to each other. Li Yuan said to Li Shimin: "You lead the troops over and get Yang Wengan's confession, as long as it is confirmed that this matter is related to the prince, I will abolish him and make you the prince." Li Shimin was overjoyed, the dawn of victory was just around the corner, the throne of the crown prince was in hand immediately, what is a little Yang Wengan, I took him down as soon as I made a move. Who knows, Li Shimin was happy early, before his army arrived, Yang Wengan was killed by his subordinates, this time, there is no proof of death, Li Shimin's depressed head is black, Li Jiancheng is long breath. Li Yuan, at this time, he slowly came to his senses, and after a long time, I was used as a gun by the second kid, he played a trick to kill people with a knife. Therefore, the final characterization of this matter is that Yang Wengan rebelled and had nothing to do with the prince, but the prince was not cautious enough during the ** emperor, and the ministers around him had the responsibility to exile Wang Qi to Sichuan as a punishment. Li Shimin's side didn't get any benefits, and Li Yuan also exiled one of his ministers, named "Du Yan". It is equivalent to Li Shimin's busy work, and in the end, he ended up playing 50 boards each. After this incident, Li Yuan felt that he couldn't let the two boys fight any longer, and if they continued to fight, they would lose both. Therefore, he called the two of them to the palace and said earnestly: "You two are brothers, we are a family, stop making trouble, have time, sit together and talk." Since the old father has spoken, the face project still needs to be done, so the prince set up a banquet in the East Palace to entertain Li Shimin. After three rounds of wine and five flavors of food, Li Shimin drank too much, and his uncle Li Shentong carried him back to the Qin Palace. Unexpectedly, the next day, there was a ** news from King Qin's mansion, at yesterday's banquet, the prince poisoned King Qin's wine, and King Qin vomited more than when he came back, and his life is currently in danger. In fact, the authenticity of this matter is doubtful, no matter how stupid Li Jiancheng is, he will not kill people in his own house, everyone knows that King Qin went to drink in the palace, but he died because of poisoning in the wine, so can Li Jiancheng get out of the relationship? Ten have**, this is another good play directed and acted by Li Shimin. Li Yuan learned wisely this time, and did not deal with Li Jiancheng, but just said lightly: "King Qin can't drink too much, drink less in the future." Li Shimin's two counterattacks did not achieve the expected results, so he played the third card: "retreat is advance". He is a great hangator in Eastern Shaanxi Province, and his office is located in Luoyang, so he said to Li Yuan that if he wants to go to Luoyang, he will not let his eldest brother look at him unpleasantly. In fact, Li Shimin has already installed a group of his own people in Luoyang, and the worst plan is to break with the prince and divide the Tang Dynasty with Luoyang as the backing. Li Yuan didn't think much about it, he thought it was good, and the two of them separated, so they had a lot less to worry about, so they approved. When Li Jiancheng heard about it, he hurriedly ran over and said to Li Yuan: "Father, you can't let King Qin go to Luoyang, once you let him leave Chang'an, it will be to let the tiger return to the mountain, and it will be difficult to control him again." Li Yuan patted his head: "I'll take it, and I'll be used by this kid again." So, he urgently ordered that the king of Qin be forbidden to leave Chang'an. From this moment on, Li Yuan's mind took a 180-degree turn, and he understood that he had to choose one in the palm of his hand and the back of his hand, who to choose? That's still the prince, the second child is too cunning, and he accidentally fell into his trap. 
After making this decision, Li Yuan began to act, he first knocked out the two most important advisers around Li Shimin, Fang Xuanling and Du Ruhui, and asked them to leave Chang'an City, and they were not allowed to return without an edict. Then he took advantage of the opportunity of the expedition to the Turks, let Li Yuanji take command, and transferred several generals under Li Shimin to Li Yuanji. According to Li Yuan's assumption, he wanted to cut off the civil and military generals around Li Shimin, weaken his power, and let him be an ordinary King of Qin. Unexpectedly, Li Jiancheng was more ruthless than him, and his purpose was to directly kill Li Shimin. At the critical moment, it was still the mole who sent a message to Li Shimin, which gave Li Shimin time to calmly fight back, and also had the later changes in Xuanwumen. Who the hell is this mole?