[Remind again not to link the production process with reality, it is all simplified by Hengyi, it should not be serious, please do not be exquisite]

The raw materials of masonry are easier to find, Su Yan found clay by the river when making pottery, or selected the most delicate clay for making pottery, the raw materials of masonry are directly inferior clay, and a large amount of clay can be found in the upper or lower reaches of the river.

In addition, in order to increase the hardness of the finished adobe bricks, Su Yan also added crushed stone and grass straw to the clay.

The place where the masonry is made is directly placed by Su Yan by the river, and the clay is dug out with stone chips and then mixed with gravel and grass straw, and then a large ball of clay is kneaded into a regular rectangle about ten centimeters high, and finally the large cuboid is divided with a stone knife, and the small cuboid is about 20 centimeters long, about 10 centimeters wide, and about 5 centimeters high, which is the specification of the masonry that Su Yan needs.

The open space of the snake tribe's residence is very large, estimated to be about 5,000 square meters, and three walls need to be built to enclose the snake tribe's residence with the peak where the cave is located, and the total length of the three walls is at least 200 meters, plus the depth of the wall foundation, the height of the whole wall is expected to reach two meters, and considering the strength of the wall, the length of the masonry needs to be used as the width of the wall.

In this way, the entire wall needs at least 80,000 bricks and stones, and the entire wall project is calculated in 100 days, and 800 bricks and stones need to be made every day, even if all the adult labor force of the current snake tribe of more than 50 people is put into it, a person needs to make at least 16 bricks and stones a day.

But these are just impossible statistics, the labor force of the snake tribe cannot spend an entire day on the brick wall, they need to hunt and fish to meet the food needs of the snake tribe, of course, there are fish cages, the snake tribe does not need to spend a lot of time on collecting food every day.

It took about five days for Su Yan and a few adult female clansmen to make a batch of about 300 adobe bricks and put them on the ground to dry.

At this time, Su Yan thought of a very serious problem, adobe bricks are different from modern cement bricks, cement bricks are made of cement as a coagulant, and they will not be easily damaged by wind and rain.

The adobe bricks that Su Yan is making now are different, if it rains, these adobe bricks will basically fall apart, and the adobe bricks must be fired to resist the invasion of rain.

Well, firing is firing, but there is one more step, and with the width and thickness of the adobe bricks, burning with fire will not be as easy to crumble as the pottery embryo made by Su Yan before.

Thinking of this, a good idea popped up in Su Yan's mind, the previous pottery embryos were all shattered in the flame because of their poor quality, and the other idea was not because the pottery embryos were too thin, if the embryos were made thicker, the probability of successful firing would not be greatly increased.

However, the production of pottery was postponed, and the most important thing was to burn the adobe brick wall, and in Su Yan's memory, there were countless times when wild beasts came to the residence of the snake tribe at night and even during the day.

Fortunately at night, the tribesmen slept in the cave, and there was a burning fire outside the entrance of the cave, and the wild beasts did not dare to rush through the fire into the cave.

Daytime is different, and if a wild beast strikes during the day, the people who operate in the clearing are likely to pay with their lives.

If the clearing is fenced off with a brick wall, it is unlikely that the remaining beasts except for those that can climb trees will cause harm to the snake tribe.

So now building walls with bricks has become Su Yan's first goal at present, and the matter of making pottery is second.

There were several more blazing fires, and three hundred pieces of masonry were placed in batches in three fires and burned with flames, and the flames burned from morning to night, but fortunately a large amount of firewood and grass was collected from the woods in advance, otherwise the fire would not have been able to burn for so long.

The next day, Su Yan picked up an earthen brick from the ash pile that had no heat, and this adobe brick had become stronger under the day's flames, and the water flush would not leave much trace on the adobe brick, which was enough.

Su Yan led a few adult female clansmen to dig a rectangular pit at the edge of the clearing, the width of the pit was a little longer than the length of the adobe bricks, and the depth of the pit was about 30 centimeters.

After the pit is dug, first put a layer of mud bricks wet with water in the pit, and then use the clay slightly diluted with water as the adhesive between the two bricks to paste a layer on the first earth brick, and then the water soaked earth bricks miss the first half of the bricks for base addition, and repeat until all the adobe bricks on Su Yan's hand are used up.

The last brick wall was only 70 centimeters long, 1 meter 7 high, and 20 centimeters wide, and Su Yan pushed the brick wall a little harder, but the brick wall did not move at all.

Now is not the time to test the strength of the brick wall, but also to wait for the clay in the brick wall to dry completely, and then it is up to the adults to test the strength of the brick wall themselves.

Another two days passed, and Su Yan honestly taught two groups of students in the tribe to learn Chinese and Mandarin, while also waiting for the brick wall to dry.

On the afternoon of the third day after the wall was built, the hunting party returned to the tribe with a game weighing fifty kilograms, and Su Yan invited the leader and the witch to the brick wall.

Su Yan made a two-handed push motion against the brick wall, and then asked the leader to replace him, becoming the leader with both hands on the brick wall.

"Forcefully."

The leader pushed the brick wall a little harder, the brick wall did not move, the leader began to increase his strength, and he didn't know how much strength the leader exerted, the brick wall was already a little tilted.

"Stop."

The leader put down his hand and breathed steadily, it seemed that the leader was far from using all his strength, which was also a normal thing, after all, Su Yan also understood that the power of the leader far exceeded the strength of modern adults, and if the leader was put in the modern era, it would be at least at the level of a strong man.

Su Yan asked the leader and Wu to squat down, and he took a wooden stick and drew a simple map on the ground, showing a simple map of the Snake tribe's residence, and then surrounded the clearing with a line, and then drew a few beasts on the outside of the line.

The main purpose of Su Yan's drawing of this picture is to make the leader understand, Wu followed Su Yan to learn words and Mandarin, Wu can understand the meaning of Su Yan's words more easily than the leader, just use words to explain to Wu, and can only use pictures to represent the leader.

Su Yan pointed to the brick wall and then to the county on the picture, indicating that if the open space was enclosed with a brick wall, then the beasts would not be able to enter the open space.

After Su Yan's detailed explanation, the leader understood what Su Yan meant, and knew that if the length and width of the brick wall increased, even the leader would not be able to tear down the wall.

The leader understood, and the witch understood, that if there was a wall, the serpent tribe's habitat would not be invaded by wild beasts.