Tubo suddenly raised troops to invade the world, and as soon as the news came out, it immediately shocked the government and the opposition, especially for Li Shimin, who was about to go to Mount Tai to seal the Zen, it was even a blow to the head, and after reacting, he even almost smashed the Liangyi Hall in anger.

Originally, Li Xiu had reminded Li Shimin before, asking him to be careful of the frontier and not to be taken advantage of the opportunity to invade the Tang Dynasty, Li Shimin also listened to it at that time, and in his opinion, the most likely thing to happen was the Western Turks in the Western Regions, or Xue Yantuo in the northwest, so he also secretly ordered people to strengthen the defense in these two directions, as long as the other party dared to send troops, it would be attacked by the Tang Dynasty.

But what Li Shimin never expected was that this time it was the southwest, speaking of which it was not the first time that Tubo had a conflict with the Tang Dynasty.

However, although Tubo surrendered to the Tang Dynasty, the relationship between the two countries is still not very good, and there are some small conflicts on the border from time to time, but the scale is not large, and there is no essential contradiction between the two countries, plus Tubo is located on the plateau, and the Tang Dynasty cannot go up, so on the surface, the two countries maintain a calm relationship.

It is estimated that it is precisely because of the above reasons that Li Shimin did not guard against Tibet, but he didn't expect that it was Tubo, which had never had a major conflict, but suddenly raised troops to invade the Tang Dynasty, but the reason why Tubo invaded the Tang Dynasty is very interesting, not to block Li Shimin's Zen and the like, but because of other reasons.

According to the war report sent by the local officials in Songzhou, since the Tubo declared itself a vassal to the Tang Dynasty, the two countries have also set up border markets on the border, which is also convenient for trade between the two countries, and even some bold businessmen have entered the territory of the other country to do business, for example, there are some Tubo merchants in Chang'an, and although Tubo is located on the plateau, there are also some Tang merchants who want money and do not want to die to venture into Tubo, because the profits of a trip are too rich, a small tea brick, in the territory of Tubo can be sold hundreds of times the profit, it is easier than grabbing money.

But as the exchanges between the two countries become more and more frequent, there is a situation, that is, some Tubo people see the prosperity of the Tang Dynasty, but also yearn for it, plus Tubo is not a central group like the Tang Dynasty, but a kind of national structure similar to the tribal alliance, there are countless tribes large and small within Tubo, these tribes are mainly Songtsen Gampo on the surface, but the internal management is under their own control, and Songtsen Gampo does not want to interfere.

Some Tibetan tribes saw the prosperity of the Tang Dynasty, coupled with the fact that the Tang Dynasty also controlled some plateau areas, especially after the annexation of Tuyuhun, the Tang Dynasty bordered Tubo, and the exchanges between the two sides were more convenient, so in this case, many tribes moved to the areas controlled by the Tang Dynasty to live, which was also convenient for trade with the Tang Dynasty, and under the rule of the Tang Dynasty, they could also get various preferential conditions, and even when they encountered snow disasters, they could also get relief from the Tang Dynasty.

At the beginning, the people who moved to the Tang Dynasty were only some small tribes located on the edge of Tubo, they were not taken seriously, and even a snow disaster could wipe out more than a dozen small tribes, in order to protect themselves, these small tribes moved to the Tang Dynasty, and then settled under the guidance of the Tang officials, formed some very primitive towns, and lived better and better.

But as time went by, more and more Tubo people knew the advantages of living in the Tang Dynasty, so more people were tempted, and even some larger tribes entered the territory of the Tang Dynasty en masse.

As more and more Tubo people enter the territory of the Tang Dynasty to live, the Tubo are also a little unbearable, after all, they live on the plateau, the population is not much, if it continues to lose like this, I am afraid it will not be long before there will be no one on the side of their Tubo close to the Tang Dynasty.

In this case, Tubo naturally asked the magistrates of the Tang Dynasty very strongly, and also asked the Tang Dynasty to prohibit the Tubo people from entering the country again, but this request was rejected by the officials of the Tang Dynasty, because for these local officials, population is also a very important political achievement, and now the Tang Dynasty is strong, and the Tubo was the defeated general of the Tang Dynasty in the past, so naturally he did not take the request of Tubo to heart.

As a result, in this case, Tubo was naturally very annoyed, and some time ago, the unrelenting Songtsen Gampo once again asked Li Shimin for peace, but was refused, so Songtsen Gampo raised tens of thousands of troops to invade the border of the Tang Dynasty again, but was blocked by the defenders on the Songzhou side, and now the two sides are also in a tug-of-war.

"Songtsan Xiao'er, don't I really dare to kill you!" In the Liangyi Palace, Li Shimin angrily overturned the bookcase, pulled out the sword next to him and roared angrily, no wonder he was so angry, after all, he was about to go to Mount Tai to seal Zen, which is also his biggest wish now, but now that such a big thing is happening at the border, if it is not handled well, I am afraid that this time the Zen will be in vain.

"Your Majesty is angry, the most important thing now is to mobilize a large army to rescue, although Tubo has not yet invaded our territory in the Tang Dynasty, but Tubo is not a small country after all, if there are more troops, Songzhou is likely to be unable to hold it." In the face of Li Shimin's anger, the eldest grandson Wuji stepped forward without fear and suggested that Songzhou is the main road between Tubo and the Tang Dynasty, so every time Tubo sends troops, almost all of them will attack Songzhou.

Regarding the eldest grandson Wuji's suggestion, Fang Xuanling and others also echoed it, and even Li Xiu expressed their support. Speaking of which, Li Xiu should not have been here, but today Li Shimin convened all the ministers to discuss the matter of Mount Tai Feng Zen, and prepared to leave in two days, but he didn't expect to suddenly receive an urgent report from Songzhou, and then he knew about the Tubo army.

Although Li Shimin was furious, he did not lose his mind after all, and after losing his temper at the moment, he immediately began to discuss with his ministers about sending troops, soldiers, major affairs of the country, and the army's expedition has always been a very systematic matter, not only as simple as mobilizing the army, but also logistics, routes, battle plans, and so on, all of which must be prepared in advance.

In the afternoon of the same day, the plan to send troops was decided, and the next morning, the appointment of sending troops was issued, and the entire Datang Dynasty also turned like a tight machine, and it was estimated that it would not be long before tens of thousands of troops could reach the front line in Songzhou.

However, what everyone didn't expect was that on the afternoon of the third day, when the mobilization of the army had just begun, Songzhou quickly sent a war report, this time it was a good news, but when they received this good news, Li Shimin and the civil and military officials of the court doubted the authenticity of this good news, because the content of the good news was too unbelievable.

The date of the signing of the good news in Songzhou is only five days different from the last war report, but it is only three days different from the Chang'an report, it is estimated that it is also because the news is urgent, so the soldiers who reported the news are desperately hurrying, which is only two days ahead of schedule, and according to this good news, the tens of thousands of troops of Songtsen Gampo have been defeated, and it is a fiasco, this is a happy thing, but the content of the good news is too amazing.

It turned out that Songtsen Gampo led troops to attack the Tang Dynasty, and the Tang army also sent troops to meet the enemy, and the two sides launched a decisive battle in the southwest direction of Songzhou City, although the Tang army did not have an advantage in numbers, but because the soldiers were full of food, and they had defeated Tubo before, they occupied a psychological advantage, so they did not fall behind at all, Songtsan Gampo estimated that he also had scruples, so he was very cautious in using troops, which led to a stalemate between the two sides.

After the Tang Dynasty annexed Tuyuhun, it also stationed a lot of troops there, and now Tubo attacked Songzhou, so the surrounding garrisons also went to the rescue, and as a result, on the third day when Songzhou sent away the war report to the imperial court for help, a government soldier who was originally stationed in Tuyuhun also arrived at the battlefield, this government soldier was not much, only one team, that is, one hundred and fifty people, and the leader of the troops was a Guoyi captain.

Datang is a government military system, each government soldier has a Zhichong captain, and two Guo Yi captains, but the government soldiers are divided into upper, middle and lower three classes according to the number of soldiers, and the number is between 1,000 and 4,000 people.

However, what everyone didn't expect was that it was this team of 150 people who broke the balance on the battlefield in the next day's engagement, especially the leader of the Guoyi Lieutenant, who led more than 100 cavalry under his command to break through the defense line of the Tubo people, penetrated the Tubo army in one fell swoop, and even almost killed in front of Songtsen Gampo.

In the face of this strong Tang cavalry, Songtsen Gampo was also frightened, and hurriedly retreated back at the moment, as a result, he retreated, the Tubo army was also demoralized, and the main general of the Tang army also took the opportunity to press the whole army, and finally defeated the Tubo people in one fell swoop, followed by a cruel pursuit battle, according to the description of the good news, the Tang army beheaded more than 3,000 enemy troops in this battle, and captured countless materials.

And this is just the beginning, the Tang army did not let Songtsen Gampo escape, but sent several elite cavalry to pursue, you must know that the current Tang army is not the past, the Tang army used to live mainly in the plains, on the plateau will be greatly reduced combat effectiveness, now many Tang troops are stationed on the plateau, and even some are directly recruited from the local ethnic groups, so there is no need to worry about the problem of altitude sickness, as a result, this chase is also deep into the territory of Tibet.

The results have not yet come out, but when the report of Zhan Jiebao came, the Tang army at the front had already bitten the tail of the defeated army of Tubo Gampo, and if they were lucky, they might be able to capture Songtsen Gampo alive.

No one expected that the crisis on the Tibetan side would be solved so easily, and he won such a big victory, the most critical of which was naturally the brave and invincible Guo Yi Duwei, at first Li Xiu still doubted whether Xue Rengui ran to Tubo, but now Xue Rengui is obviously guarding the city gate at the Xuanwu Gate, and it is impossible to leave without permission, until later when he saw the name on the good news, he remembered a fierce general who was almost forgotten by him.