With the permission of the crown prince, he walked to the huge sand table and drew a line with his fingers.

This line runs from east to west, starting from Shanhaiguan in the east and connecting the nine sides of the northern frontier of the Ming Dynasty to the west.

Laibin withdrew his palm and began to elaborate on his tactical thinking: "It can be clearly seen from this sand table. ”

"Between the Ming Dynasty and the Manchu Qing Dynasty, there is a continuous mountain range formed by Qilaotu Mountain, Nuruer Tiger Mountain, and Yan Mountain."

"It can be said that it is a natural barrier separating the Ming Dynasty from the Manchu Qing Dynasty, the south of this mountain range is the Central Plains of a flat river, and the north of this mountain range is a flat and vast grassland."

"The mountains are full of cliffs, valleys and jungles, and it is difficult for the average skilled hunter to walk in them, let alone march in large numbers."

"If the Manchus want to cross this natural mountain barrier that stretches for thousands of miles, there are only three ways to go."

Lai Ping stretched out his right hand and pointed to the westernmost mountain road, saying that the mountain road is actually a valley path along the river between the steep valleys: "The westernmost one is called Gubeikou to Dao, that is, the exit of Miyun County." ”

"But it can be seen from this sand table that it is said to be a river valley trail, but in fact it is a long and rugged mountain road, and it is very difficult for soldiers to walk in it, let alone drag heavy baggage with mule and horse carts."

"Mule and horse-drawn carts are basically inaccessible."

"The principle that the soldiers and horses go first before the grain and grass are moved, as long as a general understands this truth, marching in the Gubeikou Road, it is not a caravan of a dozen or hundreds of people, carrying a small amount of grain, can pass."

"If the Manchu Qing Dynasty wants to attack the capital, there must be tens of thousands of horses, and the consumption of grain and grass, as well as the military baggage such as arrows and gunpowder, is a very large amount."

"Therefore, this place can only be used as a surprise attack by a small number of soldiers, but in the area of Miyun, the exit of the Gubeikou Road, the elite of Cao's commander has been stationed, and it is almost impossible for the Manchus to attack the capital through the Gubeikou again."

Laipin pointed to the Lulong Road in the middle, which was the same as the Gubeikou Road, which was just a valley path along the river valley between the steep mountains, and there was no way to realize the march of a large number of soldiers.

After introducing Gubeikou Road and Lulong Road, there is only the last Panhai Road where Shanhaiguan is located.

The reason why Shanhaiguan is called Shanhaiguan is because the west of Shanhaiguan is the end point of the Yanshan Mountain Range, and the east is the vast East China Sea.

Between the Yanshan Mountains and the East China Sea, there is a Pingchuan Avenue about ten miles wide.

Along this seaside Pingchuan Avenue, it can not only transport a large amount of grain and grass, but also give full play to the greatest cavalry advantage of the Manchu Eight Banners.

But on the narrow Pingchuan corridor between the Yanshan Mountains and the East China Sea, there is the world's first Xiongguan, which is Shanhaiguan.

As long as you cross the Shanhai Pass, and then run more than ten miles along the narrow seaside Pingchuan Avenue, it will be the Central Plains land of Pingchuan.

After introducing the three routes for attacking the Ming Dynasty, Gubeikou Road, Lulong Road, and Panhai Road, where Shanhaiguan is located.

Next, the dangerous terrain was introduced in detail, and there are many key points that can be held with less victory, so detailed that even Man Danchen, a fierce general who grew up in Shanhaiguan, is ashamed of himself.

Even detailed to the point of cumbersomeness, Zhu Shun, the crown prince Zhu Cihong, Sun Chengzong, and the students of the Army Martial Arts Hall looked at it, just to say the steep terrain of as many as a thousand, this memory is enough to make people amazing.

He was not talking about an idea, but was still trying to tell the bullet points about which side of the hill was steeper, where the jungle was denser, and where there was a usable source of water.

The detail and tediousness of this appointment is really amazing, and through his explanation, everyone seems to be immersed in the scene.

Laipin's knowledge of Shanhaiguan and his understanding of the geography of the mountains and rivers in the northern frontier of the Ming Dynasty made even Man Danchen, a fierce general who grew up in the border passes and battlefields since childhood, feel extremely amazed.

Not to mention others, especially the crown prince Zhu Cihong, who began to face up to this squad leader who claimed to be the most untrue among the students of the third phase of the Army's Martial Arts Hall.

War sand table deduction is one of the most enthusiastic things for the students of the Army Lecture Hall, which can show the students' tactical thinking to the fullest, and can also continuously cultivate the understanding of war and improve the tactical literacy of the students of the Army Lecture Hall.

It is also one of the important criteria for measuring the military ability of a martial arts cadet, and the army martial arts cadets often play the role of the Ming and Manchu Qing to conduct a tactical deduction.

Only hired very little, or even almost no war sand table deduction.

Even if the results of the recruitment are second only to Zheng Chenggong, they are considered by some of the more radical students to be a fancy man with a lot of lip service, and they are very unconvinced that he can be the leader of the third artillery squad.

The other trainees carried out the sand table deduction of the war, and they always held a bunch of classics and read next to them, which made the trainees of the army martial arts hall even more unaccustomed to it.

From the moment they entered the Army Lecture Hall, the cadets of the Army Lecture Hall were ready to die for their country.

What's the matter, you're here to read there with a bunch of books every day, and you want to go to the military department to be a civilian official who never fights?

In the eyes of the students of the Army's martial arts hall, his behavior is greedy for life and afraid of death, and he is going to be in the same stream as the Donglin Party.

In addition to this, Laipin often disappears without a trace, less than ten days and half a month, and even two months after a long time.

This is even more intolerable to the students of the Army's Martial Arts Hall, who have worked so hard to practice the six major teachings of the Model Order, just for four words.

Sacrifice your life for your country.

This act is already a deserter, and when it comes to the day when he dies calmly for Daming, he can use his lack of schoolwork as an excuse to shirk it, refuse to rush to the battlefield, and be a happy civilian official in the military department alone.

Many students of the Army Martial Arts Hall found the prince Zhu Cihong and asked for orders to be severely punished, and even said that they would be expelled from the Army Martial Arts Hall.

The crown prince Zhu Cihong saw that the matter was getting worse and worse, so he personally came forward to calm down the matter, because he knew that he was not a deserter.

On the contrary, he went to the frontier earlier than the other students, and although he didn't know what to do, the prince Zhu Cihong believed in his judgment.

Mr. once said to him that Cao Bianjiao, Zheng Chenggong, and Laipin are all to be recorded in the official history, and they are all loyal people who can die for the Ming Dynasty.

It was with the support of the crown prince Zhu Cihong that he was able to continue to stay in the army lecture hall and continue to go to the northern frontier again and again, leaving a general talent for the crown prince Zhu Cihong.