According to the investigation of later generations, the entire Lancang River is a rare river that can be navigated in its entirety after a slight rectification! This means that if the boat is strong enough, the area of land it can control along the river is too large! The ship is loaded with soldiers, heavy bed crossbows, supply weapons, etc., and even the marching speed is much faster in Southeast Asia than the land march, because if there is a moon, the weather is clear, and it can be carried by night and day.

"It is more difficult to march from land in Nanzhao and other locations, but in fact, if you start from Guangzhou, then march here by boat, and then arrive at the Lancang River, and then go upstream, it is not that difficult. In this way, if you besiege Nanzhao from multiple angles, it will not be difficult to take down the other party. Li Ke said with a calm face.

To put it bluntly, if the Tang Dynasty controls Vietnam, Laos, Thailand and other places in the later generations through Lingnan Road, and in turn surrounds Yungui in the hinterland, then it is not difficult to solve them at all.

"And places like these, they are currently mainly the source of the Kunlun slaves of the Tang Dynasty." Li Ke pointed to Malay, Indonesia, the Philippines and other places in later generations, "The land area of these places is not small, and the climate and other aspects are also suitable for growing crops." Because they are hot all year round. ”

"The blacks in these places, that is, the Kunlunnu, are still in the uncivilized stage, they don't have any concept of land at all, and it is not difficult for us to build a town on it, and the port."

"In this way, the ships of Datang along the way will have a supply position in the future."

"And the ocean can also be hugely profitable, and as long as we control the production of advanced sea vessels, then that means we control the ocean."

"The simplest point, Dad, big brother, if we can build a 100,000-strong ship, one ship can carry a thousand soldiers, and ten fleets are enough to carry an army of 10,000 people. If we wish, we can attack Persia from the sea, attack the land, and we will gradually increase our gains, and if we cannot defeat it, we will retreat at any time by ship, and the enemy will not be able to follow. ”

"In this way, we are invincible." Li Ke told Li Shimin about the importance of sea power.

Looking at Li Ke's continuous drawing on the map, Li Shimin and Li Chengqian's spirits were a little trance, as if this was not a map, this was the land of Datang.

"Until one day, the national flag of my Datang can be planted in all corners of these places!" Li Ke simply used a wooden stick to draw a circle on the entire map.

Li Shimin couldn't hold back a little, good guy, your pie is too big for your father.

"You ......" Li Shimin said: "The premise is that there are enough sea ships, and they must be advanced enough, listen to what you mean, the sea ships you have researched are very advanced?" ”

"Yes, at least it is more advanced than the sea ships of the Tang Dynasty, and it is unlikely that there will be 100,000 Hu sea ships, but there is no problem with 20,000 Hu or even 40,000 Hu sea ships. Moreover, if the iron-making and steel-making technology developed by the craftsmen of Erchen continues to improve, Dad, steel can also be shipbuilding! Li Ke said.

Li Shimin and Li Chengqian glanced at each other, but the two of them were not much shocked, in fact, many people thought that the ancients would be shocked when they heard that steel could be used to build ships, but in fact they were not.

Because the reason why the ancients didn't use steel to build ships was because they couldn't afford to build them, they had basic theories and cognitions related to buoyancy, and the simplest point was that the ancient royal family and nobles had iron pots and iron basins, at least the Tang Dynasty.

The iron basin can float when thrown into the water, why can't the iron boat? So the ancients of steel shipbuilding were not much shocked, but they couldn't afford to build it, second, they didn't have the technology, and third, they didn't need it.

"Iron ships made of steel are stronger, and they are not afraid of fire or anything like that. And it can be bigger! When the time comes, it is impossible to say that one ship will be able to transport 10,000 soldiers. And the premise of these is to ensure that shipbuilding technology is absolutely confidential. ”

"Actually, Dad, that's one of the reasons why I insist on giving these craftsmen titles." Li Ke said with a smile.

Li Shimin and Li Chengqian glanced at each other, if they still couldn't figure it out before, these things were enough for them to figure it out and realize the importance of craftsmen.

"When will the national universal school you are talking about be done?" Li Shimin suddenly asked.

"Actually, you can do it at any time, but the current conditions are not available, so Erchen wants to wait for a while, at least until the end of spring ploughing." Li Ke thought for a while and said.

"Good! Execute it as soon as possible, how much pressure is there this time, dad will give you it, since these craftsmen are important, the promises given to them must be done, so that their children can go to school, and it is obviously easier for those who have learned knowledge to train to become craftsmen. Li Shimin nodded directly.

"No problem. By the way, I forgot what I just said, Dad, you have to give me the authorization to use the 800-mile expedited, I have to recruit someone to go back to Chang'an, and I have to let him build the sea ship first. Li Ke thought for a while and said.

"Yes." Li Shimin nodded directly, the eight-hundred-mile expedited is not used casually, it has to be authorized by him.

"That's okay, exactly twenty years later, my Datang Sleepless City is going to start auctioning the land, and when the time comes, let them, the merchants, start paying for it." This time, the caravan will be called Datang Royal Shipping Group. Li Ke said with a smile, "We are going to do business this time." Of course, you don't have to go through the court. ”

Li Shimin: "......"

"You can watch it." Li Shimin was a little helpless, what Li Ke said was not unreasonable, if it passed through the court, there was a possibility that this matter would be leaked, but it would be better to hide it with normal business practices?

"Did you two hear that?" Li Shimin looked at Chang Lin and Julang and asked.

"Yes!" Chang Lin and Julang hurriedly saluted.

"If the true purpose of this matter is known to the sixth person, and it is not the three of us who said it, then the two of you, the Nine Clan, I will not investigate who said it." Li Shimin's tone was very flat, but Chang Lin and Julang both knew that Li Shimin's words were not joking.

"Yes!" Chang Lin and the living room both bent down and saluted.

"Chang Nei Shi, prepare to draft an edict, eight hundred miles urgently." Li Ke turned around and walked directly to the table next to him, and then picked up the brush and paper on the table.

Chang Lin quickly went to prepare sealed fire paint and other objects from the side.