The evil shadow asked, and Guo Jia also followed up with a detailed introduction, which immediately made the evil shadow feel refreshed, the urn city is a small city outside the city gate, and the defense facilities developed from the protective wall are convenient for attacking the enemies surrounding the city gate from all directions. Generally speaking, the city attack in the era of cold weapons is mainly based on the city gate, and if the city gate is not breached, it will be difficult for the army to attack the city, and all the armies can't climb over the wall, right? The walls of ancient megacities were several feet high, and they were not so easy to climb. In other words, if you can't break through the urn city, you can't attack the city gate, and the urn city is like a satellite or a gate god guarding the city, and it is indeed the best arch acropolis building.

"Oh! What about the others? I don't know much about the fortifications of the city! I know the castle tower! It is the symbol of the city, and its majestic appearance shows the majesty of the city and the demeanor of the nation. It was not only a lookout post, but also the headquarters of the generals defending the city, and an extremely important shooting base. ”

Hearing Guo Jia's introduction, the evil shadow asked with interest.

As the name suggests, the corner tower is built on the four corners of the city wall, which is mainly used to make up for the weak links in the defense of the corner, that is, the corner of the city wall, so as to enhance the defense ability of the entire city wall. The horse face is the attached pier platform that protrudes outward in the city wall, because it is slender, like the face of a horse, so it is called. Once the enemy soldiers are in the city, the guards on the adjacent horse faces can be organized into a cross-fire net, so that the attackers can be defeated by the enemy left and right. Generally, every 60 meters -100 meters there is a horse face, and the building of the horse face is expected to be the enemy's situation, called the enemy building. The enemy floor plane is square, covers an area of 10.24 square meters, double-layered, four-wall brickwork, hard hilltop, tubular tile covering, the ground floor faces the city on one side of the arch coupon door, the building is provided with wooden stairs, the upper floor is placed on the floor, and the four sides of the upper floor each open the arch coupon window two holes. Looking up at the enemy towers, like a forest of sentry posts, it is awe-inspiring. The windows on the upper floor resemble the eyes and ears of giants, and there are most enemy towers. It is still facing a certain street in the interior of the city, and monitoring is carried out from it. It can be seen that in both peacetime and wartime, the enemy tower has the function of a place for public security and prevention. ”

Guo Jia responded with a faint smile, and immediately followed up with a gushing voice. After a pause, he continued.

"Guancheng is a small-scale city set outside the city gate, as long as the enemy approaches, the city gate will be closed, attacking the enemy close to the main city from behind, for the attacker, if you can't break through the city, it is almost impossible to break through the main city, which is a bit similar to the urn city, just the difference in the location of the building facilities!"

"In order to enhance the defensive effect of the city walls, special defensive measures were set up at the gates and in places that were vulnerable to attack. Generally speaking, in an offensive battle, the city walls assume most of the defensive functions, and these facilities play a pivotal role. By the way, the most common female wall is the low concave wall placed on the city wall, which helps to avoid the enemy's arrows and attack the enemy below. The shooting hole not only allows you to shoot, but also to embed enemy arrows. The female wall is the most common architectural measure to be set up on the edge of the city wall to facilitate the battle. And in order to repel the enemies who climbed the city walls, there were various construction facilities mentioned above. ”

"Well, other cities are okay, Wudu City and Yong'an City must be taken care of, think about it, think of it, all the building facilities that are beneficial to the defense effect must be used, and Wudu City and Yong'an City must be built into iron barrel cities, and there must be no loss! Immediately send the order to go down, buy a large number of special architectural drawings of various cities, and find all kinds of special architectural drawings of the city! And send an order back to Taoyuan Valley to see if you can develop a new special defense facility on your own! ”

After listening to Guo Jia's explanation, the evil shadow finally had a new understanding of the war in the ancient cold weapon era, thought about it, and immediately spoke.

"Yes!"

The Shadow Generals should be in unison.

"By the way, I've seen several kinds of buildings from the classics, so I'll add to that. One is to echo with Fengxiao said that the city is a wall that complements each other, the city wall is used for defense in the war, and the city gate is the weakness of the defense line. The walls were built to prevent the gates from being directly exposed, so they could prevent the gates from being attacked directly by siege equipment such as crashes, and they also had the advantage of opening and closing the gates without the enemy noticing. The effect of the protective wall is similar to that of the urn city, except that the direction of the passage left by the protective wall is not set to enter and exit. There is also a kind of facility that is also used to enhance the defense effect of the city gate, that is, the hanging door, the hanging plate that the hanging door is set up in order to enhance the defense ability of the city gate from the rear, the surface is pasted with iron sheet, the narrow groove dug out on the door is used to move up and down, the pulley that is arranged in the gatehouse can make the hanging door rise and fall freely, the speed of entering and exiting the city gate is faster, and the entry of some targets can be effectively blocked in time. If the walls are thick enough, I suggest that we can put two gates at the gates, one for the ordinary sliding gates, and the other for the hanging gates used in war. The third type is not used in Wudu City, which is Yangma City, also known as Fengyuan, which is a low wall built around the inner side of the moat to contain enemies who try to cross the river.

As the old saying goes, only the city besieges the people, but the pond besieges the city! The "pool" is the barrier of the "city", and the "pool" is the moat. It is difficult to introduce a large amount of water from Wudu City, and it is basically difficult to build a moat. In fact, we take a compromise method, with thistles or antlers, horse guns, horse pits, etc., all around the city wall, can also form a similar effect to a moat, and then build a sheep and horse city to the periphery! ”

Xun Yu pondered for a while, and then slowly added.

"Well, it's best to add these three points as well! By the way, does Wen Yuan have any experience in defending the city? ”

The evil shadow is now eager to build Wudu City into a metal city, as long as he wants to build any defensive facilities he wants, he said, and finally looked at the city of Wudu City.

"Now the city has prepared to accumulate a large number of wolf's tooth swatters, slams, flying hooks, iron striking wood, piercing rings and other equipment to strike and capture the incoming enemy. There are also equipment to strengthen the defense of the city gate, such as the knife car and the jack gate, and the defensive equipment such as the ground hearing, crane, and soft ladder are set up around the city wall. The subordinates dare to guarantee that as long as the last general is in Wudu City for one day, it will definitely make it difficult for all enemy forces to pass, the city is in the people, and the city is dead! ”

Hearing the evil shadow test, Zhang Liao immediately explained with dignity, and raised his head and said seriously.

;