Li Yan's vision is very accurate, and he knows that whether it is irrigation water conservancy or dungeon, it is a costly thing.

Gao Yihuan has such an achievement in such a short period of time, and he doesn't know how much food he has invested.

The Ming Dynasty built countless fortresses in the border fortress, each fortress cost at least one or two hundred taels of silver, and the larger one required more, and the cost was close to one thousand taels.

However, these costs are mainly in two parts, one is manpower, and the other is the cost of materials for building forts.

Gao Yihuan has a special fort-building team to build the fort, and the tunhu in the fort also have to participate in the construction, so the efficiency is very high.

Anyway, to resettle the displaced people, you also need to spend money to build houses for them, so Gao Yihuan simply invested a little more and built a fort directly.

Tunpu is the home of the tun households, so they don't need to be paid, just give food, and the material for building the fort is the red bricks fired by the wheel kiln, which is much cheaper than the green bricks, so the cost is much less.

At this time, a group of people came to a dungeon under construction next to the whirlpool, and saw many figures busy.

The fort was chosen on a raised knoll, which was higher and conducive to drainage and also for defense.

Everyone turned over and dismounted outside the fort, and saw many strong men on the fort wall, some of them were responsible for hanging frames of red bricks on the wall, some were busy building brick walls, and many men and women went into battle together, all of them were holding hoes and carrying flat baskets, digging and picking up soil around the fort wall.

The fort wall is made of bricks and earth, so that the fort wall is built and the moat is built.

Gao Yihuan pointed to the busy masons on the wall and said, "Jie Shuai, those men with red scarves on their heads are all fort building teams specially formed by me. They were a hundred men in each team, and they were responsible for building cities, forts, roads, and bridges for me. The others were the inhabitants of the fort, and the fort would henceforth be where they lived, so they all had to help. ”

Li Yan was secretly surprised, "You don't have more than one such fort-building team, right?" Also, how long will it take to build such a bunker? ”

"I have twenty fort-building teams, all of which are building forts and repairing cities in various places." Gao Yihuan said with a smile: "The time to build the fort is not long, the key is to prepare the materials." If the materials are all in place, everyone will work together, and a fort can be built in more than a month. ”

In two years, the construction of the fortress in Luyi and other places has been completed.

Gao Yihuan did not disband the city-building team, but organized them into many teams to build in various places.

This kind of fortress is just an ordinary dungeon, and Gao Yihuan is so strong that he doesn't have the strength to build fortresses everywhere.

These forts, mainly distributed along the vortex river, were used for the transportation of materials and red bricks, and the farther villages were built by the squires and villagers themselves, but the level naturally could not be compared with the fort building team, probably only the level of Gaojiabao.

"Let's go, go in and have a look!" Li Yan was very interested.

At that moment, a group of people entered the fortress that was still being built, and the craftsmen and people who built the fort stopped one after another to salute Gao Yihuan, and then continued to work.

Li Yan was a little surprised, he could see that Gao Yihuan had a high prestige among these people, and he could get along with the people and craftsmen.

This point, Li Yan thinks, is very rare.

The forts built by the fort building team are all round forts, with a circumference of only about one mile, so in order to facilitate defense, there is only one fort gate.

When they entered the castle from the drawbridge, they saw that on the back of the fort wall were the houses of the fort people, as well as granaries, weapons, farm tools, shacks for oxen, mules and horses, and in the middle were threshing fields, and wells.

It is also worth mentioning that there is also a toilet and manure tank in the fort, which is convenient for collecting excrement and garbage, which can not only fertilize the fields, but also prevent diseases.

Under the leadership of Gao Yihuan, Li Yan and others visited various places in the fort, Gao Yihuan explained them one by one, and everyone nodded one after another.

After everyone saw the fort, they rushed to Luyi County, and when a few people saw a huge prismatic fortress, they were all shocked.

There is no such city in Henan, and the whole city stretches out a few corners, which is undoubtedly a huge waste.

The western fortresses are all used for military purposes, or owned by the aristocracy, and the poor are basically inhabited in them, while the cities in China are to protect the people, and the cities can range from thousands to tens of thousands, or even more than 100,000 people.

The focus of the two is different, and the characteristics of the city are naturally different.

If the city in the Central Plains wants to accommodate so many people, it is natural to consider the area of the city circle and the space inside the city.

With the same circumference of ten miles, the square city is undoubtedly more land than the fortress, so it is difficult for the fortress to be popular.

Li Yan looked at it and exclaimed: "Yihuan, you are a city built with reference to the "Gongcheng". ”

In the Ming Dynasty, Sun Yuanhua and Xu Guangqi admired the western fortress very much, and the Ming Dynasty also imitated the "Gongcheng" in Liaodong, it is said that Ningyuan Fort is, but the cost of building the fort was huge, and the Ming Dynasty's finances could not afford it, so the fortress was not promoted.

Gao Yihuan didn't know very well, but he didn't explain, "Well, it's a little reference." ”

When everyone came to the city, Gao Yihuan explained the role of the fortress, and talked about how the various city walls cooperated to block tens of thousands of male soldiers.

"Jie Shuai, this city only lives in the army, not the people, so I am not afraid that the grain and grass will be consumed too quickly, even if tens of thousands of horses come to attack, there is absolutely no problem in defending it for half a year."

Li Yan's eyes lit up when he heard this, "How much silver did you spend to build this city." ”

Gao Yihuan said: "It cost a total of 60,000 taels of silver before and after, and it took a year and a half to complete the construction. ”

After Li Yan listened, his eyes darkened again.

A small county town, it actually cost 60,000 taels to build, and the people accompanying him looked at Gao Yihuan strangely, and couldn't help but feel a little distressed, how rich is this, so he can be so defeated.

Li Yan pondered for a while, but said to Gao Yihuan: "As far as I know, the city is a Ming Dynasty scholar Xu, and the commission building is said to refer to the fortress of the West. He believes that it is a completely harmless policy to protect the city with Taiwan, the city with the city, and the people with the city. As long as you build more big guns and then build a platform, the enemy will not dare to approach within a few miles, let alone attack from the front. Claiming that one is strong, it can be tens of thousands of soldiers. ”

Li Yan said that Master Xu should be Xu Qiguang, but Gao Yihuan didn't know much about this, he didn't expect that the Ming Dynasty people had already made the fortress.

After Li Yan finished speaking, he looked at the city and couldn't help but say: "Yihuan, you only have a platform, but you don't have a cannon, and you can't be called a "gun city"!" ”

Gongcheng, Gongcheng, you need to have Gongcheng, but now Li Yan has only seen the city, but he has not seen Gongcheng, so he reminded him.

Hearing his words, Gao Yihuan suddenly sighed and said, "Jie Shuai, I have also cast a lot of artillery, but casting cannons is extremely expensive and consuming refined iron. Since I fought a battle with the Ming army in Nanzhi, Ma Shiying has been very strict in blocking the trade routes, and I can't buy fine iron, so the supporting artillery has not yet been built. ”

"You can still forge cannons?" Li Yan's face was shocked, but along the way, there were too many things that surprised him, so he was not surprised.

Li Yan frowned, pondered for a while, and turned to an official behind him, "Ruzhou, the smelting field near Baofeng County, is there still refined iron?" Tune some up General Gao! ”

Gao Yihuan was immediately overjoyed when he heard this, but the official replied: "Jieshuai, the mine in Ruzhou has just recovered, and I am afraid that there is not much refined iron at present. ”

Gao Yihuan frowned, immediately kicked his nose on his face, smiled and waved his hand: "I haven't practiced it now, it doesn't matter." It's better to hand over the mine to me, and I'll practice it myself, so as not to trouble the marshal. ”