Today it was Zhi He Biao who led the hunting team out hunting, and he had not yet returned, so Su Yan brought the two copper shields and two wooden shields back to his place of residence and put them down, and turned to inspect the city wall under construction.

The clay along the large and small rivers near the dragons' settlements has been emptied, and the tribe has turned to the left and south banks of the rivers or further along the rivers to dig for clay.

In the past, it was very troublesome to make adobe embryos, first the clay was lived, then the clay was piled up into a large boxy adobe brick, and then the large adobe bricks were divided into standard adobe embryos with a stone knife, and finally fired with firewood and grass.

Now it is different, the step of making adobe embryos has become very simple, thanks to the large production of tools for blister copper casting, Su Yan asked the carpenter to make a batch of molds according to the size of the adobe bricks, as long as the clay is loaded and pressed into the mold, and then the mold is upside down, and a piece of adobe embryo is directly formed.

The next step of firing the adobe bricks has also been changed, there are specially built large-scale brick kilns, the adobe embryos are sent to the brick kiln for firing, the new bricks compared with the previous adobe bricks in hardness and resistance to rainwater erosion have been significantly improved, so Su Yan removed the word "soil" from "adobe bricks", and there is no need to call it "adobe bricks".

Ancient Chinese city walls were not originally made of bricks, but were made of earth rammed (ben).

There is a wall-building technique called plate building, that is, the soil is sandwiched between two wooden planks and pounded with a pestle to become a wall.

Plate building technology is also called rammed or rammed earth technology, has a long history, from the Longshan cultural site four thousand years ago can be found, when people mastered the more mature rammed earth technology, modern can see the Lintao Qin Great Wall and many sections of the Great Wall after the Han Dynasty, is also rammed earth plate building.

Plate construction is also a relatively simple method of building walls, but the walls built with plate construction techniques are not as hard as those made of bricks or stones.

Before building the city wall, Su Yan had thought about using the plate construction technology to build the city wall, but after thinking about it carefully, Su Yan put down this idea and went to the northern region.

The dragon tribe has not yet found any powerful primitive tribes, they live by hunting, fishing, picking fruits, picking wild grasses and plant roots, the quality of life is relatively low, still in the very primitive Stone Age, such a tribe even if there are more people than the dragon tribe, it is difficult to pose much threat to the dragon tribe.

The tribe that really poses a threat to the dragon tribe may be in the south, if they really exist, the dragon tribe will not be able to bump into them for a while, even if there is an enemy attack, a one-foot high wall is almost enough.

Dragons don't need tall walls to build a city, and it takes more time to build a brick wall than a rammed earth wall, but brick walls are stronger than dirt walls, and earthen walls are more susceptible to rain erosion.

In addition, if the scale of the city is expanded in the future, the bricks removed from the old city wall can be used to build brick houses even if they are not used on the new city wall.

The total length of the city wall is more than 900 zhang, and it is completely built with a turning head, and the height of the ground of the city wall reaches one zhang, and the width reaches one foot and three inches, that is, two bricks are placed horizontally.

On the inner side of the wall, there was a staircase three feet wide every three feet, and there were three steps, the first two feet high, the second four feet high, and the third six feet high.

When the enemy attacked, the people of the dragon tribe could stand on the third step and lean out from the city wall, almost without affecting them to throw short spears and stones at the enemy, and even bow and arrow shooting later, if necessary, they could also press their hands on the top of the wall and turn their whole body to the wall, the wall was enough for them to stand firmly.

Finally, there are a total of eight lookouts set up in the middle of the four city walls and in the corners, the lookouts are seven feet long, and people can stand on them, and there are doors on both sides, so you can walk on the city walls casually.

The gates were not pulled down, and each wall had a gate in the middle, which was one foot long and eight feet high, and would consist of two wooden gates five feet long and eight feet high.

The construction of the city wall is the largest and most important project carried out by the dragon tribe now, the dragon tribe has more than 1,000 adult laborers, and more than 500 adult laborers are required to carry out this project every day, and the fishing team and hunting team will also participate in the construction of the city wall after finishing their own work, and there are even more minors and pregnant women who assist on the side.

It can be said that the dragon tribe is almost full force to build the city wall, as long as the city wall is built, this city can be regarded as half of the success.

The benefits of a larger population and more labor force have already appeared, such a huge project, now that spring is about to pass half of the time, the construction progress of the city wall has been completed by more than 50 percent, and it is completely possible to build the city wall before the end of spring, and the time when it does not rain in summer can be completely built in the area planned by Su Yan, and each tile house will have a courtyard.

Su Yan inspected the construction area and found no problems, the factory dragon tribe that built the city wall has been carried out twice, and now it is the third time, it is difficult to make mistakes, only at the beginning Su Yan needs to determine the scope, height, width and other things of the city wall, after entering the right track, Su Yan does not need to interfere again, and now the construction of the city wall is in charge of Jian and Ming.

Jian Du is familiar, he is the leader of the small tribe who first joined the snake tribe, and is now the middle level of the dragon tribe.

Ming is the leader of a medium-sized tribe that joined the Dragon Tribe, this medium-sized tribe has no name, but it has one of the most obvious characteristics, that medium-sized tribe is a merger of two tribes.

Ming and Jian, like Jian, are both middle-level of the Dragon Tribe, for example, several patriarchs of the Dragon Tribe can lead the team alone, belonging to the captain level, Najian and Ming are the team leader level, and the same belongs to the team leader level, as well as Dali, Luchen, etc.

After inspecting the circle, Su Yan returned to her place of residence and saw Xiaohua Xiaoyue spinning linen from a distance, which was originally something that pregnant women had to do, and Xiaohua Xiaoyue participated in it normally.

In fact, Xiaohua Xiaoyue also wanted to help in the fishing team, but the clansmen saw Xiaohua Xiaoyue's "thin" body and the identity of the king's spouse, they all rushed to work, and Xiaohua Xiaoyue didn't have a chance to work if she wanted to.

Perhaps, in their opinion, the "thin" little flower Satsuki is suitable for the slightly easier work of weaving linen and teaching children to read.

About half an hour later, Zhi and Biao came back with the hunting team.

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