Although Li Shimin has not thought about it for the time being, he wants to do something to Goguryeo, after all, the time and conditions are not ripe, and the time, place, and people are not available.

Chen Dade went to Goguryeo, but he also gained a lot, using his own identity to investigate the mountains and rivers of Goguryeo, folk customs, and climate change, and contacted a large number of former Sui soldiers who were scattered in Goguryeo, visited the local people, and wrote the book "Records of the Envoy to Goguryeo", which is of great value to the study of Goguryeo in the Tang Dynasty.

However, Rongliu Wang Gao Jiancheng obviously did not think so, he did not cherish this opportunity for a friendly exchange of visits between the two sides, but after Chen Dade left, despite the opposition of the Goguryeo domestic aristocracy, he restarted the plan to build the Great Wall of a thousand miles.

In this way, the confrontation with the elite class has been intensified, one wants to have a good relationship with Datang and develop economy and trade, and the other regards Datang as an imaginary enemy, always guarding against the attack of the other party, and is unwilling to associate with it.

King Rongliu wanted to transfer the great pair of Lu Yuan Gai Suwen to Liaodong to supervise the construction of the Great Wall for thousands of miles, but Yuan Gai Suwen did not obey his royal order.

This made Rongliu Wang Gao Jiancheng feel threatened, and his heart was even more angry.

However, Yuangai Suwen is a hereditary Goguryeo great opponent Lu, a representative of the aristocratic class, and the Rongliu King Gao Jiancheng has to look at his face, and using royal power to suppress him has no effect at all.

Most of Goguryeo's military power was in the hands of the Great Pair of Lu, and when King Gao Jiancheng was able to take over the throne of Goguryeo from his elder brother King Yingyang, it was because of the support of the Great Pair of Lu and the aristocracy.

If the two sides tear their faces, it will be unfavorable to Rongliu Wang Gao Jiancheng, but in order to get rid of this situation, Rongliu Wang Gao Jiancheng invited all the confidants and ministers to discuss, wanting to get rid of Lu Yuan Gai Suwen.

How can Lu Yuan Gai Suwen be a vegetarian, every move in the court is in his hands, how can this kind of news be hidden from his eyes.

Since Rongliu Wang Gao Jiancheng couldn't tolerate him, then Yuan Gai Suwen still had nothing to scruple about, so he came to strike first.

Yuangai Suwen arranged a military drill and invited Rongliu Wang Gao Jiancheng and the hundred officials loyal to his court to inspect the scene

However, in the nearby restaurant, he arranged for everyone to eat and drink, and when he was full of food and drink, the executioner who had already been prepared broke into the restaurant and killed all the officials who had discussed with King Rongliu to get rid of Yuangai Suwen.

Later, he broke into the palace and killed King Rongliu and divided his body, and did not hold a funeral for King Rongliu.

After that, Yuangai Suwen proclaimed himself the "Great Mo Lizhi", and established the nephew of the king of Rongliu, Gao Zang, as the king and regent. The King of Gozang is in vain, and the military power and state affairs are all controlled by Yuangai Suwen.

Li Shimin did not pay much attention to the death of King Gao Jiancheng, the king of Rongliu, and still canonized the new king of Goguryeo according to custom.

In the spring of the seventeenth year of Zhenguan, Li Shimin sent an envoy to make a special trip to canonize Gaozang as the Shangzhu State, the King of Liaodong County, and the King of Goguryeo.

In order to divert the contradictions in Goguryeo, Yuangae Suwen united with Baekje and began to storm Silla, but Silla could not resist and lost 40 cities in a row.

The king of Silla was also a vassal state canonized by the Tang Dynasty, and at this time, the first thing that came to mind was of course to ask the suzerain, the Tang Dynasty, for help.

After the Silla envoys arrived in Chang'an, they inevitably exaggerated and stirred up some rights and wrongs between Goguryeo and Baekje, saying that Goguryeo was ready to interrupt Silla's road to the Tang Dynasty.

Of course, Li Shimin can't tolerate Goguryeo doing this, not to mention that Silla is a friendly little brother with the Tang Dynasty, you Goguryeo beat dogs, don't you have to look at the master?

Therefore, Li Shimin sent envoys to Goguryeo to mediate the dispute between Goguryeo and Silla.

Although Yuangai Suwen hopes to make friends with the Tang Dynasty, he doesn't want to be an enemy of the Tang Dynasty, and he doesn't want to have a conflict with the Tang Dynasty, but he is also a person who wants face and temper, and he said to Chen Dade, the envoy to Goguryeo: "Chen Envoy Jun, this is the contradiction between our Goguryeo and Silla, so don't worry about the Tang Dynasty!" ”

"Silla is also a vassal state of my Tang Dynasty, Goguryeo invaded Silla at will, and the Tang Dynasty, as the suzerainty of Silla, has no reason to ignore it." Chen Dade was very dissatisfied with Yuan Gai Suwen's attitude and said loudly.

"According to what Chen Yuanjun said, Baekje is also a vassal state of my Goguryeo, shouldn't Silla bully Baekje, and we Goguryeo shouldn't care?"

Yuan Gai Suwen's tone was not so good, and there was a taste of ridicule.

The mediation ended in failure, and Chen Dade was so angry that he returned to Chang'an directly and sued Yuan Gai Suwen in front of Li Shimin.

After Chen Dade said goodbye without saying goodbye, Yuangai Suwen expected that the Tang Dynasty might not give up, so he sent people to the Xue Yantuo Department in Mobei to provoke the relationship between Xue Yantuo and the Tang Dynasty, hoping to join forces against the Tang Dynasty.

The uncle could bear it, but the aunt couldn't bear it, Li Shimin decided to teach Goguryeo a lesson, and decided to send troops to Goguryeo.

This move was fiercely opposed by Wei Zheng, the Duke of Zheng, and Xuanling, the Duke of Liang, who strongly advised Li Shimin not to start a war lightly and conquer Goguryeo.

"Your Majesty! Goguryeo did not infringe on my Tang Dynasty, and it should be the best policy to value peace. Fang Xuanling said.

"The land of Liaodong is my homeland of China, why can't I take back my homeland from Goguryeo?" Li Shimin said righteously.

"Having said that, but that has been a long time ago, now I am the first lord of the Tang Dynasty, has not yet recovered, now the most important thing is to let the people recuperate, at this time forcibly conquer Goguryeo, it is really unwise, the tragic lesson of the previous Sui Yang Emperor's three expeditions to Liaodong is a lesson from the past!" Fang Xuanling argued.

"After the defeat of the previous dynasty, I should avenge the soldiers who died in Goguryeo.

If Goguryeo is not removed, it will always be a hidden danger, and I don't want to leave this trouble to the next generation after I die. The blood feud of millions of soldiers in the previous dynasty cannot be avenged. ”

Li Shimin was determined and did not back down, Fang Xuanling and others repeatedly persuaded him, but he could only cooperate with Li Shimin and make preparations before the war.

Li Shimin specially wrote a letter and asked people to send it to the pearl Khan Yinan of Xue Yantuo's department, telling him that he would take the crown prince Li Ke to conquer Goguryeo in person, and Chang'an City would be very empty, if you are brave enough, you can bring troops to give it a try, maybe you can have a chance to occupy Chang'an City.

The Zhenzhu Khan Yinan of the Xue Yantuo Department, who was originally instigated by the Yuangai Suwen of Goguryeo, was a little impatient, and when he received the handwritten letter sent to him by Li Shimin, he was so frightened that he didn't dare to move, and hurriedly dispelled this idea.

Zhenzhu Khan Yi Nan, he is really afraid of being bullied by Li Shimin, where is the courage? Enemies of Datang.

In November of the 18th year of Zhenguan, the Tang army divided its troops into land and water to attack Goguryeo, the southern road, with Zhang Liang, the secretary of the criminal department, as the general of the Pyongyang Road march, and led the generals Chang He and Zuo Nandang to lead 40,000 troops and 500 warships to attack southern Liaoning from Laizhou.

On the north road, the British Duke Li Tao was the general manager of the march of Liaodong Road, and the Jiangxia King Daozong was the deputy, and he led 60,000 troops out of Yuguan to attack Liaodong.

In February of the following year, Li Shimin personally led the Sixth Army from Luoyang, drove his own expedition, and joined Li Shiji's army offensive in the north.

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