The reason why Yang Wenhua brought back 100,000 Goguryeo Qingzhuang in addition to the 50,000 cloth army of Zhou Xiwang and the 20,000 Goguryeo troops of Gao Yanshou was mainly to build an ice city.

To be precise, outside the new city, expand an ice wall that is both offensive and defensive.

The circumference of the new city is more than 5,000 meters, and moving out 10 meters is the location of the ice wall set by Yang Wenhua, and the construction of the ice wall of less than 6,000 meters by 100,000 people is also a quick and easy thing to do.

You don't need a foundation to build an ice wall, you just need to water it directly on the snow, and you don't need any other messy materials, just melt a lot of snow outside the city.

Yang Wenhua first asked people to find an open-pit coal mine, dug some coal and dragged it back with an iceboat, and then dug a lot of ground outside the city to drain the stove.

After burning the coal, put it in an iron pot, put the snow into water, and then scoop the water out and pour it into the finished wooden mold, and a piece of ice brick that doubles the length, width and height of ordinary bricks is done.

Because the quality requirements are not high, the production speed of the ice bricks is very fast, the snow does not need to be completely melted to enter the mold, and the ice bricks do not need to be completely frozen and can be taken out.

In addition, there are ice roads back and forth for transportation, and under the sufficient supply of food, the 20,000 Goguryeo troops who are still living a long life are under the watch, and no one dares to be lazy, and 100,000 people have built the outer wall of one meter and two meters thick by two meters in one day.

The next day, although the height increased, making it much more difficult to transport, Yang Wenhua set aside a place for soldiers to guard the city, reducing the thickness of the wall by one-third, and the height of the wall also increased by two meters.

On the third day, the wall only needed to be 40 centimeters wide and the same height of two meters, and it was almost completed before lunch, and after the ice wall was built to six meters in the afternoon, Yang Wenhua asked for a narrower specification and increased the height by one meter.

A wall of ice that was seven meters high, with a bottom wall one meter thick and a middle wall eighty centimeters thick, enough to withstand the impact of this era, was made out in this way.

It then took a day to build a number of stairs connecting the floors, so that the soldiers could quickly reach the positions they needed to defend.

On the first floor, the one-meter-thick wall is equipped with 5,000 archers, who can shoot arrows together at the order, and it is enough to arrange 4 shifts of 20,000 Goguryeo youths and strongmen.

The second layer, the eighty-centimeter-thick wall, arranged the early 10,000 troops under Gao Yanshou, and it was enough to rotate as spearmen in two shifts.

On the third floor, the wall is forty miles thick, and 10,000 Han people cloth soldiers are arranged, which are also enough to rotate in two shifts as spearmen.

In the end, Yang Wenhua used another 10,000 Han cloth cloth troops as a prison army, and it could also be used as a reinforcement.

After repairing the outer wall, Yang Wenhua began to arrange the soldiers on the defensive, and everyone drilled, no matter what they did, it was right to experiment first.

After a try, the problem came out, there was no problem with the bottom layer, the key was that the upper two floors, the forty centimeter standing position was too narrow, the wall could be thickened, and it was bound to make the archers on the lower floor lose their effectiveness because the shooting hole was too long.

In the end, Yang Wenhua built a 40-centimeter ice wall one meter away from the bottom wall, and built two layers of springboards with wooden sticks to solve the problem.

And so four days passed.

At this time, there was further news from the domestic city, and at this time, Yuan Taizuo had gathered nearly 300,000 soldiers in the domestic city.

And Yang Wenhua got the news five days ago, although this is the news that the spies sent back at a speed of more than 100 miles a day.

Considering that Yuan Taizuo is leading a large group of people, it may arrive at any time in three days at the latest.

Yang Wenhua had to step up the renovation of the new city.

The houses in the city do not need to be changed, and Yang Wenhua builds the streets.

After all the other small city gates were blocked, starting from the four main city gates, leaving one-meter-wide passages along both sides of the street, eighty centimeters wide ice walls were built to enclose them.

In this way, it took another three days to complete the renovation of the city.

At this time, the news came back that the domestic city had sent troops, and the vanguard was 30,000 elites of Goguryeo, and Yuan Taizuo led 200,000 Goguryeo troops mixed with the Tatar people as the central army, and more than 100,000 rear troops were people, responsible for escorting grain and grass.

The same ice boat is traveling, the speed is quite fast, and it is expected to reach the new city in three days.

Taking advantage of the fact that there were still three days, Yang Wenhua did not let Goguryeo Qingzhuang idle, but began to build a fortress.

The fort was also built with ice bricks, and the fortress was built into a circle with a diameter of five meters and a height of six meters, and the top was gradually reduced to a spire with wooden planks.

Three days later, when Yuan Taizuo's front army arrived, all they saw was a seven-meter-high ice wall, and there was a six-meter-high fortress every ten meters.

The former commander was a bold man, and after arriving in the morning to set up the camp, he launched a tentative attack in the afternoon.

As a result, more than 3,000 horses were dispatched, and as soon as the soldiers approached the ice wall, they immediately rang the golden gong and hurriedly retreated, except for leaving hundreds of corpses on the snow, there was no meaning.

For the new city in front of him, the former army commander felt like he had encountered a hedgehog, and before the army could get close to the city wall, he first encountered a wave of mixed attacks with bows and arrows and ice eggs.

Yes, it is indeed a bow and arrow mixed with ice eggs.

This is Yang Wenhua considering that he does not have many soldiers, so he made use of Goguryeo Qingzhuang, after all, he can't spend so much food to feed in vain, that's 100,000 people.

But if the 100,000 Goguryeo young and strong are all armed, Yang Wenhua can't be completely assured, after all, Yang Wenhua now has a total of 10,000 Han people leather armor army and 50,000 Han people cloth army.

There are a total of 60,000 troops that can be trusted, and as for the 20,000 Goguryeo troops under Gao Yanshou, Yang Wenhua can't fully believe in their loyalty, and it is already a risky thing to be able to throw them into the battlefield.

In order to make Goguryeo Qingzhuang contribute, he had to guard against them, and in the end, Yang Wenhua had no choice but to let them attack with ice eggs.

In fact, a fist-sized ice egg, smashed from a height of five or six meters, as long as it can hit someone, the power is still not small.

If you can hit the head, you can completely smash people to death, and even if you hit the shoulder, you can also make people lose their combat effectiveness.

On the other hand, ice eggs are even better than bows and arrows, after all, leather armor can defend against bows and arrows.

But for Bingdan, as long as you don't wear enough, it's useless for you to be an iron armor and iron helmet, and people who can wear a lot in this era are unlikely to be a small soldier.

Seeing the effect of ice eggs from the telescope, Yang Wenhua was also surprised, after all, there is no precedent for such a thing, who would use ice eggs in wars, in ancient times, there were not many plain wars in winter, let alone siege warfare.

Yang Wenhua didn't care what the precedent was, as long as he saw that the ice egg was easy to use, he immediately had the idea of forming a ice egg army.