After all the civil and military ministers left, only Li Shimin and the people who were named by him were left in the hall. Li Yan was still lying on a stretcher, and there were Li Jingheng and Yanbei as their companions just now, so he didn't think anything, but now he was the only one lying down. He wanted to stand but didn't dare to stand. When he lay down, he felt that everyone's eyes were paying attention to him. Not to mention how uncomfortable it was.

Li Shimin asked Li Ke and Li Yan to stay, but ignored them again. Instead, he said to Li Jing and others: "Tubo is now full of wings and has always been rude to our Tang Dynasty. Today, the Tubo ambassador was beaten by these juniors. He would definitely not take this breath with Tubo's previous arrogance. What should you do if you think you should deal with it?"

"Your Majesty, Tubo has been arrogant for a long time, and our Tang Dynasty must not give in to this matter. Therefore, I am sure that we will launch troops to invade our Tang Dynasty in the future, so I hope Your Majesty will make plans early." Fang Xuanling first came out and said.

"What Fang Xiang said is right!" Duke Wei Li Jing also stood up and said, "If Tubo raises troops, it is very likely to march from Jiannan Road. It belongs to the southern border of the Tang Dynasty, and its military strength is weak, and it is close to the Six Divines in the South. Except for Nanzhao, the other five Divines are all good friends with Tubo, which is more conducive to Tubo's dispatch of troops."

"Well, what the two dear friends said is reasonable. It seems that my Tang Dynasty must be prepared to use military force with Tubo." Li Shimin was also very clear-headed and agreed with Fang Xuanling and Li Jing's analysis. Li Yan, who was lying on the ground, admired Li Jing even more. He remembered that the first battle between Tubo and Tang Dynasty was in Songzhou, Sichuan, which was indeed very close to Tubo and Liuzhao.

"Hou Qing, as the Minister of War, you will introduce the current situation in Tubo!" Li Shimin pondered for a while, then turned to Hou Junji and said. Hou Junji was the Minister of War at that time, and collecting information from the enemy country belonged to his purview.

"Yes, Your Majesty!" Hou Junji, who had a fierce nose with a tiger-eyed eagle nose, stood up and said, "Tubo is located in the southwest of our Tang Dynasty, and there are only some Qiang tribes between our Longyou Road. The northeast of the country is Tuyuhun, and the southeast is Liuzhao. The current Tubo Zanpu is named Songtsen Ganbu, and is the son of Nangri Lunzan. After Songtsen Ganbu ascended the throne, he moved the capital from Shannan Pibo City to Luoshe, and annexed Supi and Yangtong tribes, defeated Dangxiang and Bailan, defeated Tuyuhun, and obtained its old land. It was extremely powerful. Although it was not as strong as the ** in its prime, it was also an enemy that should not be underestimated..."

Hou Junji talked to the people in the hall, mainly introducing the situation in Tubo from the military aspect. Li Yan listened roughly and was very disappointed with the intelligence system of the Tang Dynasty. What top-secret information could have been heard? Who knew that Hou Junji had been talking for a long time and was all about military information, such as the military strength of Tubo? What is the combat power of the army? Who are the main generals? The rough distribution of troops, etc. As for domestic people's livelihood, politics, economy, etc., there is almost no valuable information.

Hou Junji talked for a long time, and finally took a sip of tea and added: "In addition to the strong military strength, Tubo also has a good position. Because its terrain is extremely high, the border with our country is extremely steep, and most of the troops cannot pass through. And a few passes are heavily guarded by Tubo, which can be said to be easy to defend but difficult to attack."

Speaking of this, Hou Junji hesitated for a moment, as if he had thought of something difficult to solve, and then continued: "And those who have heard from Tubo say that, except for the native Tubo people, it is difficult for outsiders to adapt to the climate of Tubo. For example, there are some Tang Dynasty caravans. Once they enter the territory of Tubo, many people in the caravans will experience symptoms such as headaches, blurred eyes, tinnitus, and fatigue. Moreover, people will become very fragile. A small cold may kill people."

"Oh? There is such a thing in the world?" Li Shimin asked hesitantly. It was the first time that other civil and military officials heard about this kind of thing and started to talk in a low voice.

"Your Majesty, this matter is absolutely true. The Tubo people once boasted that it was their great blessing, which gave Tubo a natural barrier. With this barrier, even if there are thousands of troops, it will make other countries unable to step into Tubo!" Hou Junji replied with a positive look.

"Although the affairs of ghosts and gods are absurd, they must not be unbelieved..." Li Shimin pondered and seemed very confused, and the other ministers were all unsuccessful. The royal family of the Tang Dynasty claimed to be descendants of Laozi Li Er, so they highly praised Taoism. Most of the upper nobles believed in Taoism, and the most legendary things in Taoism were the immortals and other things. In order to seek immortality, many princes and ministers were refining elixirs, even Li Shimin was no exception. They raised many Taoists in the palace and occasionally refining some elixirs for him. Therefore, although Li Shimin did not believe in all the affairs of ghosts and gods, he did not believe it.

"Father, this is not a refuge for ghosts and gods at all, it's just a Tubo people brag about themselves!" At this moment, Li Yan, who was lying on a stretcher, suddenly stood up and said.

He suddenly realized that the scene he was acting was probably seen through by Li Shimin and others, but he didn't expose them in person. It was probably Li Shimin's intention to let him lie down like this. He was worried that he had no legitimate reason to stand up, and he couldn't admit that I was pretending? Just then, he heard that Li Shimin and his group were confused by altitude sickness. Li Yan was overjoyed and simply became shameless. Anyway, he was underage, so he was normal to be a little rogue.

"Oh? Liu Huang, let's talk!" Li Shimin was stunned at first. Originally, he left Li Ke and Li Yan with another meaning, but he didn't expect Li Yan to dare to expose his lies and stand up. However, he was an open-minded emperor after all, and now he was all focused on Tubo, so he didn't care much about Li Yan's minor qualities. Other civil and military ministers were also stunned, and probably didn't expect Li Yan to speak!

"It is true that what Master Hou said about outsiders being unable to adapt to the Tubo climate is indeed true, but it is not that mysterious. To put it bluntly, it is almost worthless, and it is not impossible to overcome it." Li Yan said confidently.

"Oh? The old minister is ignorant, please ask His Highness King Liang for advice!" Hou Junji asked with a somewhat ugly face. After all, he was the Minister of War and was in charge of the military intelligence of the entire Tang Dynasty. Even he didn't understand something. Li Yan would know, and he demoted him to no value, which made him look bad.

"Haha, I dare not take the advice. Lord Hou has collected quite a lot of information about Tubo. Li Yan is very impressed!" Li Yan said with a smile to Hou Junji. Although his words were a bit against his will, Li Yan was also helpless. Now his power is too weak, and it is not the time to offend people. There is a Changsun Wuji that has already made him feel uncomfortable. He doesn't want to have another Hou Junji dislike him.

Hou Junji was very proud, so he would not be angry with Li Yan, who was fourteen or fifteen years old. After hearing Li Yan's praise, his face immediately looked much better.

Li Yan breathed a sigh of relief and continued to speak: "Actually, what Lord Hou said just now that the series of discomforts caused by outsiders after entering Tubo can be collectively called altitude sickness."

"Plateau reaction? Plateau? Is this related to the terrain?" Duke Wei Li Jing murmured to himself a few times, and suddenly his eyes lit up, as if he had thought of something.

"Duke Wei is indeed powerful. He thought of the key with just this name. He is worthy of being the number one person in the Tang Dynasty!" Li Yan praised. Li Yan admired Li Jing, the legendary figure, from the bottom of his heart.

When Li Jing heard that he called Li Jing the "No. 1 person in the army", those rebellious generals had a look of their own expressions, and even Hou Junji, who regarded himself very highly, showed Li Jing's prestige in the army. However, it is no wonder that Li Jing retreated early. Now he is just a military adviser and does not control the actual military power. After all, no matter how magnanimous Li Shimin is, he definitely does not want a person in the army to threaten his emperor identity.

"Haha, Your Highness Liang praised him, how could I call the number one person in the army?" Li Jing smiled and said with a smile. He didn't pay much attention to Li Yan after the last banquet of the Five Kings. After he carefully observed today, he was very surprised. Whether it was his demeanor, temperament, or knowledge, he was almost unparalleled among the younger generation he had seen. Even Li Ke, he always looked like a foil when he stood beside Li Yan. How could he be the playboy prince in the past?

"Haha, pharmacist, you are polite. Who doesn't know that you are using troops like a god? If you didn't have the help of everyone and the Qing family, how could the current prosperity of my Tang Dynasty be?" Li Shimin also smiled, and praised everyone present, then turned to look at Li Yan and said, "Ye'er, you should talk about that 'altitude reaction', and what can I do to solve this problem."

"Yes, Father!" Li Yan bowed, "The so-called altitude sickness, in fact, is mainly because Tubo is located on the plateau and the air is much thinner than the plains. People like us who live on the plains will inevitably experience some discomfort after rashly entering the plateau. In fact, if the symptoms are not very serious, it will be fine as long as we adapt for a while."

"This... is so simple?" Hou Junji looked unbelievable. In order to figure out this matter, their Ministry of War spent a lot of manpower and material resources, but in the end they got was still a saying of ghosts and gods.

At this time, the British Duke Li Ji suddenly stood up and said, "After what Your Highness Liang said, this reminds me of when I was young, I went to visit friends on the mountain, but I didn't expect that I fell ill after one day. At first, the symptoms were almost the same as what Lord Hou said. Later, my condition worsened and almost died. My friend hurriedly carried me down the mountain. After recuperation for a few days, he actually recovered by himself. I guess that time was altitude sickness, right?"

"That's right, as long as people who have exceeded a certain height and live in the plains for many years will inevitably have various reactions depending on their physical constitution. However, some people's reactions are very weak and they don't even notice them. Some people have strong reactions. If they are not dealt with in time, they may even have life worries. At this time, the best way is to quickly return to the plains like the British Duke and rest for a few days. "Li Yan said again.

"Okay!" Li Shimin slapped the table, "If it is really as Yan'er said, then my Tang Dynasty only needs to find a garrison in Tubo and send troops to adapt to the climate there first. Why should I be afraid of Tubo children at that time? Hahaha~"

Probably because he thought of the feat of trampling on Tubo in the future, Li Shimin laughed to the sky and exhaled his anger. The civil and military officials below were also talking, especially those military generals, most of them were filled with joy on their faces, and now they were about to fight again. Most of the civil officials frowned and thought, as if they were measuring the gains and losses of the war breaking out with Tubo. However, both civil officials and military generals, the eyes of Li Yan at this time were filled with admiration.

Changsun Wuji, who was in the crowd, kept looking at Li Yan coldly until then suddenly said: "Your Majesty, although the Tubo army is strong, for our Tang Dynasty, it is just a group of native chickens and dogs. However, the army will advance before the food and grass. If we raise troops in Jiannan and Tubo, we must first solve the problem of food and grass. Jiannan Road is under the attack of Tubo and Liuzhao. Although it is rich, the transportation is blocked and cannot support too many troops to station. If the two armies confront each other, it will be extremely unfavorable for our Tang Dynasty."

If Changsun Wuji says, you are a basin of cold water that falls down, which immediately makes Li Shimin wake up. Jiannan Road includes most of the Sichuan Basin in later generations, as well as part of Yunnan, Guizhou and Gansu. Although the Sichuan Basin is rich, it is surrounded by mountains. In addition, it is rainy and the road is extremely rugged and difficult to move. It is estimated that the Tang Dynasty's army would have extremely expensive to enter there.

Li Shimin pondered for a while, then suddenly turned to Fang Xuanling and asked, "Fang Qing, I remember the previous year, Jiannan organized people to repair the roads. Can the traffic conditions improve now?"

"This..." Fang Xuanling smiled bitterly when he heard Li Shimin mention this matter, "Your Majesty, Jiannan did organize hundreds of thousands of people to build roads the year before yesterday, but it was rainy in the south. The road that had just been repaired was washed away by the rain, and it immediately became muddy and difficult to move. Now most of the wasteland is abandoned and most places are simply unavailable."

In ancient times, rammed earth was used as roads, and the most feared rain was washed. Zhuque Street in Chang'an City was paved with bricks and stones, but this was just a street. If all the roads of the Tang Dynasty were paved with bricks and stones, it would probably not be completed even if the Tang government went bankrupt.

"Hiss~" After hearing Fang Xuanling's words, everyone here took a breath. The roads built by hundreds of thousands of people were completely destroyed by rain in less than two years. They used to know that there was much rain in the south, but they didn't expect it to be so powerful.

Li Jing stood up and said, "Actually, Lord Changsun is too worried. Compared with our Tang Dynasty, Tubo is much worse in any aspect. Therefore, the old ministers have predicted that even if Tubo launches troops to invade our Tang Dynasty this time, it will definitely be a test and dare not fight to the death with our Tang Dynasty. Therefore, as long as our Tang Dynasty sends a group of elite soldiers to destroy the arrogance of Tubo, Tubo will definitely withdraw his troops after that."

I have to say that Li Jing's eyes were fierce, and he could see the general trend between the Tang Dynasty and Tubo at a glance. The Tubo people absolutely did not have the courage and strength to fight to the Tang Dynasty to death, so the first battle between Tubo and the Tang Dynasty was destined to be just a test.

Li Yan next to him was even more impressed by Li Yan. As far as he knew, in the battle between the Tang Dynasty and Tubo, Tubo raised 200,000 troops to invade the Tang Dynasty and surrounded Songzhou. However, when the reinforcements from the Tang Dynasty arrived, they killed thousands of Tubo troops, the Tubo people immediately withdrew their troops. Songzan Shibu even wrote a confession letter in his own hand, and the fierce battle in Songzhou ended like this.

"Hahaha~, the heroes have the same view, I think so too!" Li Shimin stroked his palm and laughed, but his face soon turned to worry, "It is easy to destroy the arrogance of Tubo, but this battle also exposed the emptiness of Jiannan Road's military strength. I am afraid that as Tubo's strength increases in the future, I will have another unfaithful intention towards Jiannan Road. It seems that it is still necessary to strengthen the connection between Jiannan and Guanzhong region, but this road..."

When Li Shimin said this, his brows were tightly frowned, and the ministers below were all worried. Building roads was not a problem. The problem was that they would not be able to be used soon after they were repaired. The amount of manpower and material resources spent was useless. The treasury of the Tang Dynasty could not withstand such consumption. In fact, not only Jiannan, but also the Tang Dynasty's strong territory south of the Yangtze River had road problems. Everyone knew that the south was rich, but transportation has always been a big problem. After all, no matter how much production was produced, it would be useless if it could not be transported.

"Father, my son has something to offer to solve the road problem!" At this time, Li Yan suddenly stood up and said, watching the monarch and ministers of the Tang Dynasty frown on the road problem, Li Yan laughed in his heart. This little thing is really a piece of cake for him, a modern person. Taking it out can not only please his cheap father, but also make money easily, which is simply a killing two birds with one stone.

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