The letter that made the emperor hesitate has been in the emperor's hand these days, and the emperor has also made some approvals.

"You're still a doll, what do you know? It's still too little to think about. ”

"You said that middle school is for the body, and Western learning is for use. I have long told you to think, what is the body? Why? ”

"The body, the way; Users, techniques also. The same is true of war. Use the technique for the general, use the way for the handsome......"

A large number of replies are sprinkled with one meaning:

You still think too little about a child, and the vision of the pattern is the pattern of a general or a party supervising the moderation. Although you have learned the "art" of war very clearly, but the "way" of war has not yet reached the moment, in the future, don't just look at Western knowledge, learn more about Sun Wu, vertical and horizontal and other knowledge.

How long does it take to fight like you said, gnawing down the Rakshasa castle one by one? It's going to snow in September, how many can you nibble on by September? When it's cold, what do I do to dig a zigzag trench? Let the soldiers gnaw their teeth?

If the war here doesn't end soon, won't the Rakshasas contact the Dzungaria? Once Dzungaria cooperates in the northwest, the dynasty will face the danger of fighting on two fronts, and what will happen when the time comes?

Before a war begins, it is necessary to think about how to end it.

If you are just a general's pattern vision, you are right, you can not only sympathize with the soldiers, but also break the enemy with regular soldiers. But in the eyes of the king of a country, these things you wrote are useful nonsense, I must end the war against the Rakshasa next year, and more importantly, let the Mongols see that Dashun has quickly defeated the Rakshasa country with the power of thunder, so you can't use that method.

As for what you said, wait until later, it's even more nonsense. Take the former Ming Dynasty as an example, don't say that Yingzong, who called the door, is Emperor Jianwen, is that what Zhu Yuanzhang is looking forward to? Who could have predicted what would happen behind them? Who can guarantee that when the population of Liaodong breeds in the future, it will be a Ming monarch who will reign?

After "criticizing" Liu Yu, he wrote at the end of the reply: "When you return, you will choose the dragon ban in the upper house, always in front of me, and I should always enlighten and enlighten you." ”

It seems that there are a lot of criticisms, but in fact, Li Gan is still very satisfied with Liu Yu.

The overall tone is also more like what an adult says to a child who has expectations for the younger generations.

On the fold, infiltrating the Rakshasa Castle, investigating and discovering that there were Japanese people and ships, guessing that the explorers were going to map the lower reaches of the Heilongjiang River to Japan, and preparing to rob and rob the map halfway after returning from Yongning Temple, Li Gan also drew a big circle and criticized four words: brave and wise, good.

This letter was far higher than Li Gan's expectations.

How could a seventeen or eighteen-year-old child, who was not the eldest son of the Duke family, really ask him to consider things from the overall situation? It's just that I'm afraid of too much praise and pride.

Detailed drawings, detailed explanations of the tactics of capturing the fortress, the mentality of the tribes investigated along the way, and so on. Although the words are not good and the writing is far from good, it is rare to say something.

After this letter was sent to the capital, Li Gan also discussed it with several veterans in the capital, and they all felt that the method Liu Yu said was very useful, and it really got the essence of the Western offensive and defensive system.

It's just that Liu Yu didn't fully believe what Liu Yu said, "If you don't follow this method and don't besiege for a long time, and choose to storm it, the 500-person fortress will have to make preparations for the sacrifice of 2,000 or 3,000 people."

Taizong Li Guo once said during the Battle of Jingxiang: Where does people's correct thinking come from? Did it fall from the sky? No. Is it inherent in your own mind? No. People's correct thinking can only come from social practice.

Over the years, these words have become an important pillar for the Zhedong School of Chen Liang and Ye Shi to reconstruct the study of mind and deconstruct "to conscience".

The same is true for warfare at this time.

Dashun has never fought with Westerners in a serious way, let alone captured the Westerners' fortresses.

It's not like they've never seen this thing.

There is also a fort in the southwest Tusi, but it can be captured as long as it is set up and bombarded for a while.

According to their thoughts, after the cannons, does the fort still make sense?

Although this Rakshasa people's fort seems to be in line with the Heavenly Dao, it may not be really so difficult to attack, right?

Is it possible for a fort of five hundred people to die if two or three thousand people die in a hard attack?

At the end of the Ming Dynasty, the Catholic Han Lin wrote a book introducing the fortresses, and the Ming Dynasty also built several fortresses in Xiongxian.

The problem is that in Dashun's memory, there has never been much war in Xiongxian County.

If it was surrendered without a fight, this fortress would not leave a deep memory at all, at most it would be a strange-looking fortress, as if it was just that.

Later, although Dashun was very tolerant of Catholic missionaries, Han Lin, who wrote the book, also joined Shun early to do "Rite Government Engagement", and also translated "How to Restrain the Seven Deadly Sins", trying to integrate the seven Catholic sins from the perspective of Confucianism, preserving heavenly principles and destroying human desires; He also wrote "The Testimony of the Saints" that Confucianism and Buddhism solved the two questions of "who am I" and "what am I going to do", and that if Catholicism is integrated, it can solve the final "where am I going", and that Confucianism has never solved the question of "where am I going".

This person once became the leader of the Western French Party in the Dashun Dynasty, and he can be described as a person who is not lightly spoken.

However, with the changes in the external environment, Zhang Lin's "The Complete Book of Shouyuan" did not make too many waves.

The external environment when Zhang Lin wrote this book was that the Later Jin had the strongest artillery in East Asia at that time, and the Ming army could not defeat the Later Jin in the field, so some people pondered how to build a better fortress.

The current environment ...... Houjin has been swept away by the plough court, and the strongest artillery in East Asia is in the capital; The opponents next to him are all weak chickens, and Dashun is on the offensive; The biggest enemy was Dzungaria, which was shrunk in the northwest and did not have many artillery, and was not forced to the point that Dashun was building a fortress on the border; The Eastern Mongolian tribes that need to be suppressed even have to buy iron pots, and the fortresses for repairing anti-artillery cannons have money and nowhere to spend; Xu Guangqi predicted that the future will be a great disaster for the Westerners, if they come from the sea, the sailors will certainly not be able to defeat them, but as long as there is a field force that is not blocked by the Westerners, there is no need to worry.

In this kind of environment, how can the knowledge of fortress defense be spread?

Whether a knowledge is widely spread or not depends sometimes on whether it is needed.

In general, Da Shun's understanding of the fortress is that he has heard of, has never seen, and has not used the practical experience of decades of war and hundreds of thousands of corpses.

It's just that Liu Yu's recital is written in too much detail, and he completely stands on the side of the guards and cracks down on the various methods that the besieging side may use.

It seems to make perfect sense.

This made Li Gan have to be cautious.

He recognized Liu Yu's level of Western studies, not only Dai Jinxian said that Liu Yu learned well, but also the "Brief Examination of Western Kingdoms" written by Liu Yu later also made Li Gan feel that Liu Yu is not the kind of person who talks nonsense.

With this in mind, Li Gan decided to try to attack Rakshasa in the upper reaches of the Heilongjiang River first.

If it goes well, the follow-up attack will let the Mongolian nobles come to visit the Dashun military power before the battle; If it doesn't go well...... Let's talk about it again.

Focusing on this overall goal, the strategic plan made by the DPRK and China is also very clear.

With the help of the Jilin shipyard's river ships to transfer logistics supplies, the army went upriver and captured the only castle of the Rakshasas in Nenjiang.

Through the Hulunbuir grassland, the Rakshasa people's castle in the upper reaches of the Heilongjiang River was captured, and the Rakshasa people's control over the lower reaches of the Heilongjiang River was cut off, and the military power of the Rakshasa people was divided.

After occupying the castle in the upper reaches of the Heilongjiang River, he prepared for logging and shipbuilding, and divided his troops down the river to sweep several Rakshasa fortresses along the way.

The main force continued to advance westward, and before the Rakshasa sent troops to support, it took all the fortresses of the Rakshasa River and the Shilka River, and immediately made peace with the Rakshasas.

The mission contacted by Qi Guogong also brought more than 3,000 elites. When you can't pull it anymore, you turn your face.

On that side, instead of attacking the city, but with the support of the Mongol tribes, they threatened the castles of the Rakshasas on the Baikal line, so that they did not dare to divide their forces to support the eastern front.

The bottom line of the peace talks is to give up the north bank of the Heilongjiang River, but to get the Shilka River and the Nannan River in the west, especially the river of special significance, we must get our hands on it.

Judging from the territory of later generations, it is to get the east of the Ussuri River, Sakhalin Island, and the estuary of the Heilongjiang River, plus the western part of the Heilongjiang River to expand to the west, get the Shilka River and the Nan River, and semi-encircle Mongolia from the north.

The upper reaches of the Heilongjiang River were used as the basis for ruling the lower river basins, the Nan River was used as the legal principle for the submission of Mongolia, the Shilka River was used as the forward base for threatening the southern part of Lake Baikal, the attack could be advanced out of Lake Baikal to cut off the connection between the east and west of the Rakshasas, and the Khalkha Mongols could be monitored by the defense.

The price was to give up all claims north of the Heilongjiang River, integrate into the Westphalian system on the northern route, recognize Russia as an empire, recognize the Russian throne, maintain trade and trade in rhubarb tea, and communicate with Russia without using a tributary system.

From beginning to end, the position of the Dashun court on this battle was very clear - it was fought for Mongolia.

Liu Yu's survey and mapping all the way to the east were half used as his own legal principles, and the other half was only used as a bargaining chip.

Even if it's just a bit of a chip, it's still important.

When Liu Yu's second letter arrived, the emperor had already arrived at the Jilin shipyard.

The troops on the Nenjiang front line are also ready to attack, and the emperor of the first battle is not ready to visit the front line in person, but to see what the front line is like, and whether the fortress system is as terrible as Liu Yu said.

After opening the second letter and taking a few glances, a smile appeared on Li Gan's face.

Liu Yu not only found the monument of Yongning Temple, expanded the text, and even subdued many tribes, and some tribal leaders followed him back to pay tribute.

Since the year of Xuande in the Ming Dynasty, it has been 300 years since the tribute. Now it is a great event to pay tribute again.

In this matter, Li Gan felt that Liu Yu had done quite well, some level.

It seems that Liu Yu is also a good hand at fighting, in the battle of Yongning Temple, no one died on his side, and more than 100 Rakshasa people were killed. Although there are tricks, it can also be seen that Liu Yu is still okay.

Later, he talked about robbing the Rakshasa expedition, kidnapping several Westerners, and robbing some maps, which made Li Gan even more praised.

It was mentioned in the first letter of this matter, saying that a Japanese had been found, and that the Rakshasa had also been found to be building ships on the river, so it was suspected that the Rakshasa would go down the river. Since it is an expedition, there will definitely be a map, which will be of great benefit to the DPRK to strengthen its control and understanding of the frontier.

At that time, Li Gan felt that Liu Yu's brain was very useful, but he didn't expect Liu Yu to really do it. Among the memorabilia were more than a dozen maps that had been simply translated, and the Rakshasas had clearly marked their fortresses near Lake Baikal, which was urgently needed at the moment.

But when I boasted in my heart, my taste changed.

When he saw the end, Li Gan couldn't help but scold.

"Nonsense!"