Behind Zhang Debiao, a Frenchman named Vauban who looked like Juan Fu explained for a long time, and after on-the-spot investigation, Guan Shanyue finally figured out what a fortress was. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

The essence of the fortress is to change the fortress from a convex polygon to a concave polygon, so that attacking any point of the castle will expose the attacker to more than one bastion surface (usually 2-3), and the defender can use crossfire to perform multiple strikes.

In fact, the fortress was created because of the appearance of artillery, the sharp corners are made of stones, which is extremely strong, and the shell impact surface is an inclined plane, which has a strong ability to resist shelling. Moreover, the sharp corners of the bastion are independent of the main body.

The Solid Bastion is a raised platform made entirely of earth, and the hollow bastion gradually slopes from behind the fort road.

The fort was equipped with a breastwork, behind which cannons were placed. The bastion is the main structure in the system and the main firepower output. The part between the bastions is called the middle embankment, which is the former city wall. The embankment was short to ensure that the rifle range would cover the area completely.

The concave fort was built in front of the embankment to prevent the siege artillery from hitting the embankment, and some musketeers were also deployed to strengthen the defense of the trenches.

The purpose of the Triangle Fort is the same. It was only about a meter lower than the main fort to allow the artillery on the main fort to fire beyond it, and the artillery above the triangular fort also formed part of the crossfire.

In order to prevent the enemy's longitudinal fire, there are many horizontal walls set up in the concealed road, and sometimes the concealed road is directly built into a zigzag, so there is no need for horizontal walls.

The outermost ram is where the crossfire is most concentrated, and its angle of inclination helps the defender to exert firepower.

The entire fortress will be built with masonry as much as possible, and if it has to be used for some reason, the outside will be covered with thick soil. Because the soil layer can absorb energy, the masonry is not only easy to damage, but also prone to ricochet, which can lead to serious casualties.

After Guan Shanyue visited the area, he felt that this fortress was expensive, but before the appearance of modern armor-piercing shells, it was safe to resist the current shells, but he did not believe that there was a perfect thing in this world.

"Zhang Debiao, you said that if you dig a tunnel to attack Kulun City, can you capture it?"

Zhang Debiao grinned, "Master Guan, I won't tell you, we have taken these issues into consideration. If the enemy's tunnels are dug too long, the soldiers inside will suffocate to death, so the enemy must attack the embankment before digging the tunnels. However, in order to prevent the enemy from digging holes and blasting, we have dug corresponding tunnels underground. After determining the location through a special listening tunnel, they will send people into the corresponding tunnels to eliminate the enemy excavation team, or directly fill the sulfur. ”

Guan Shanyue nodded thoughtfully, glanced at Vauban who was standing behind him with a gentlemanly smile on his face, pulled Zhang Debiao aside, and asked quietly, "Where did you pick up such a treasure?" ”

Zhang Debiao scratched his head and said with a smile: "According to this guy's own words, there is a big country in the east called the Ottoman Empire, he originally came to the East to explore, but he became an Ottoman slave, and after finally escaping after a lot of hardships, he fell into the hands of the Tatars. At that time we were preparing to build a city, and it happened that the Tatars came to trade, and the slave Vauban said that he was a professional city builder, and drew a picture of me on the spot, and I thought he was a talent, so I exchanged him with iron pots and silk. ”

"That's!" Guan Shanyue looked incredulous, "Since he has such great ability, he didn't mention any conditions?" ”

Zhang Debiao nodded hurriedly, "How can you not mention it, this thing is simply a madman, he wants to transform the entire city of Daning into a fortress." And when the time comes, he wants us to attack the Ottoman Empire and avenge him. ”

Guan Shanyue clenched her wallet and felt a pain in her flesh, "You agreed?" ”

Zhang Debiao had a natural expression, "That's a must, why don't you agree." ”

"Oh my God, the Ottomans in the back are fine, don't talk about the front. Now Daning asks for money everywhere, where can I get so much surplus money to build a fortress, a Culomb city is about to make me cold, and you are still building fortresses everywhere. Lao Tzu doesn't do it. ”

"Hehe, I know that your old man doesn't agree, I told him in advance, and the others don't need to build such a big, or just build a fortress. Vauban favored the last one, because he had been subjected to inhuman treatment in the Ottomans. ”

Guan Shanyue took a long breath and glanced at Zhang Debiao, "It's pretty much the same, you two are just a couple of crazy people." This fortress is rare in our Daming, Vauban dares to give you a ladder, you Zhang Debiao dare to climb up, if you don't accept it, you can't do it. ”

Zhang Debiao looked proud, "That's, don't look at whose old subordinates it is." This is all the sequelae of the last fall, and that battle was too hard. Hey, let's not talk about it, the past is unbearable. The last general has already set up a reception banquet in the house, and we will talk while eating. ”

Guan Shanyue shook her head with a smile, and walked towards the castle in the middle with Zhang Debiao and Vauban trio, he looked at the stone inlaid city wall and the Western-style castle blending into the surrounding environment, and now he felt that it was not as dazzling as when he first came.

Everything in the world is like this, after talking about this end, talking about that end.

After Wu Xiang came to the capital boldly, he first blackened Guan Shanyue in the military department, and then tried his best to reverse it in front of hundreds of civil and military officials in the main hall, saying that Daning's army entered the customs without an edict, and the military discipline was sloppy, and the rampant in the pass was more harmful to the people than the golden boar skin after that, which is nothing, the key is that Daning's army obstructed the Liaodong border army from pursuing Huang Taiji, and Guan Shanyue became a chaotic minister and thief in his mouth.

The civil and military officials of the dynasty were not afraid of the excitement, not only did they not say anything to stop them, but also fanned the flames on the side to add fuel and vinegar, and Chongzhen's anger was rushing upwards.

He knew that there was a lot of water here, but he couldn't bear the words of the ministers, especially the cabinet ministers he relied on, all of them talked about Guan Shanyue's misdeeds in Daning, just like they had seen with their own eyes.

In fact, there is nothing about these, the most stimulating thing for Chongzhen is that Guan Shanyue entered the pass without an edict to attack the enemy, which deeply hurt his self-esteem. One Yuan Chonghuan is enough for him to be anxious, and he will kill another Guan Shanyue halfway, if he goes on according to this trend, this world is still the world of the old Zhu family, he made up his mind to take Guan Shanyue and clean up this little Xiucai who doesn't know whether he is alive or dead.

This time, Daming's efficiency was extremely high, and half a month later, Guan Shanyue, who was studying the problem of the tiger squat cannon bombing with Xu Guangqi and the masters of the weapons factory, received a holy decree to let him enter Beijing immediately.