Half a month has passed in a flash.

In the camp of the Han army.

Deng Ai reported to Liu Chanyu: "Your Majesty, there was news from the rear just now, the city wall has been built, and now the gate is being arranged, does Your Majesty want to go over and have a look?" ”

Liu Chan smiled: "So fast? Okay, let's go and have a look! ”

Then Liu Chan took Deng Ai, Huang Xu and other young generals to leave the camp and go to the back street pavilion city.

Nowadays, the four walls of Jieting City have been built, the east gate is facing the Longshan road crossing, and the city walls on both sides extend outward and connect with the high mountains on both sides.

If the Wei army came from Longshan Road, only the eastern city wall needed to be defended.

Originally, Liu Chan wanted to build Jieting City into a military fortress and a transit point for economy and trade, but at this moment, time was pressing, and Wei army reinforcements were coming, so Liu Chan could only build the city smaller, and then slowly expand it later.

Jieting City is currently a square with a side length of three miles, with an area of 2.25 million square meters, or 2.25 square kilometers.

The largest city in history is Tang Chang'an City, excluding the area of Daming Palace, there are 840,000 square kilometers, with a population of one million, it is the world's largest city, and the area of the current street pavilion city is far less than Tang Chang'an City.

The area of Yanmen Pass is 30 square kilometers, even compared with Yanmen Pass, the area of Jieting City is only one-fifteenth of Yanmen Pass.

However, at present, the role of Jieting City is only to guard against the Wei State, and the role of economic trade has not yet been reflected.

However, although the area of the street pavilion city is very small at present, its height is not to be underestimated.

The city wall of the street pavilion is four zhang high, and the Han one zhang is two meters and four, and the four zhang is close to ten meters high. Tang Chang'an City is six meters high, Yanmen Pass is ten meters high, the Great Wall is about eight meters high on average, and the Street Pavilion City is nearly ten meters high, which is already the best in the city wall.

As for the width, the same is true, the bottom is four zhang wide, the city wall is three zhang wide, the wall is slightly sloped, the lower width is narrow, such a width, even in the later Anti-Japanese War period, only the power of howitzers can be destroyed.

On the surface, the street pavilion city is gray-black with cement, like a terrifying monster lurking at the Longshan crossing.

Liu Chan led a group of young generals out of the Longshan Road Pass and went straight to the city gate in front.

When I came to the city gate, I looked at the city above, and the soldiers were busy setting up the gates.

The gates of Jieting Castle are not ordinary folio walls, but gates.

The concrete city wall is indestructible, and the only flaw is the city gate, Liu Chan naturally will not let the city gate become a flaw in the street pavilion city, so he chooses to use the gate technology in the street pavilion city.

In fact, the gate technology is very simple, as long as the city wall is built, a groove can be built in the wall above the city gate, and the cement slab city gate is placed in the groove above the city wall to set a winch, and the control winch can control the city gate to rise.

Although it is a cement slab city gate, but the thickness is also two feet, and there is also steel placed in it, which is extremely hard, there is no steel to build the city wall, but the steel to build the city gate is taken out, the city gate is not big, it is three meters five high, three meters wide, and it is enough to melt some weapons.

I saw that in the center of the city gate opening, there was a groove on both sides of the wall, which was used to jam the city gate, and the city gate fell, and it was connected to the grooves on both sides of the city wall, as if it was one.

Looking up from the hole in the wall, you can see a wide long slit from which the cement slab gate falls.

"Be careful, Your Majesty is here!"

"Stop first, don't hurt Your Majesty!"

The busy soldiers at the head of the city stopped one after another when they saw Liu Chan arrive.

Seeing Chen Zhi coming to the city gate to greet Liu Chan, Chen Zhi arched his hand and said: "Your Majesty, the soldiers are setting up the gate, and the city gate will fall later, it is very dangerous, please move to the city first!" ”

Liu Chan bowed slightly: "Well, take me to have a look!" ”

"Your Majesty, please!"

When they came to the top of the city, they saw the soldiers carrying two cement slabs to the top of the city.

Although it is a cement slab gate, it is also divided into two doors, because the cement slab is too thick and heavy, and if it is not separated, the soldiers will not be able to lift it at all. One side is concave, one side is protruding, and the middle is just docked, which can also be mixed as one.

Looking at the ground of the city wall, I saw that there was a wide gap in the ground, and there was a hollow round hole on both sides of the gap, which was naturally used to put the city gate, and as for the hollow round holes on both sides, it was enough for the next person to enter, and it was used to place the organs and carry out maintenance.

After all, the city wall is four zhang high, and the city gate is only more than one zhang high, and there are two zhang in the middle that are hollow, if you don't set up a hole to go down, you can't place the iron cable to connect the city gate, and when the cement slab falls, you can't get it up.

In addition, on weekdays, the iron cable connecting the city gate is inspected, repaired, and replaced if it is broken.

"One, two, three......"

"One, two, three...... Brothers, work hard! ”

The soldiers carried half of the city gate to the entrance of the cave, and their faces were flushed.

Seeing this, Liu Chan hurriedly instructed Lin Yuan and the others beside him: "Go and help!" ”

With the help of Lin Yuan and others, the soldiers quickly aimed the city gate at the gap in the ground and put it down, only to hear a rumbling sound, it was the city gate falling, but after a while, they heard a bang, and the city gate fell to the ground.

At this moment, another soldier brought the other half of the gate, but after a while he lowered it again.

So the gates were completely sealed.

A craftsman commanded: "Go down and place the iron cables!" ”

When the two soldiers heard this, they hurriedly took torches and went down the circular holes on both sides, and put ladders in the holes to facilitate going up and down.

Another soldier brought the iron cable and slowly lowered it into the hole, but after a while, the soldier in the hole connected the iron cable to the mechanism set up on the city gate and climbed up again.

As for how to raise the city gate, it is controlled by a winch, which is the same as drawing water from the bottom of a well.

As for the hole in the ground, a cement slab is made to cover it, just like the manhole cover, which does not affect the passage on weekdays.

The soldiers experimented several times, and by the winch, it was easy to pull up the city gates.

Chen Zhi laughed and said: "With this gate, this street pavilion city will be as stable as Mount Tai, as long as the materials in the city are sufficient, 10,000 soldiers and horses can also block the 100,000 male soldiers of the Wei army!" ”

Liu Chan said with a smile: "Only one gate in the east can be attacked by the Wei army, and the other three gates do not need to set up gates, just use ordinary city gates, and then rest the ground in the city, and tomorrow I will lead the army into the city."

According to the scout's report, Cao Pi has been asking Sima Yi to rush to make the return cannon these days, and when Cao Pi saw the city, he found that the return cannon did not work, I don't know what his expression was? ”

The generals laughed and said, "I'm just afraid that Cao Pi will vomit blood in anger!" ”