All the pregnant women who returned to the tribe did not rest, and the forage used to extract plant fibers was already ready for silk, and Wang Tian planned to assemble the loom in the next two days and start experimenting with the manufacture of linen.

Everyone began to get busy, draining the water and taking silk, and beating the coarser fibers with wooden sticks to break them into finer fibers to facilitate the use of weaving.

The people who went to the quarry introduced an ox cart designed by Wang Tian according to later generations, and the biggest difference in appearance was the two wheels.

The two wheels are made from a single trunk with a diameter of one meter, forming a flying saucer shape on the outside, with a thickness in the middle and gradually flattening around the perimeter, and a width of 15 centimeters on the contact surface with the ground.

The two wheels are connected by a 15 cm diameter piece of hard wood as an axle, and the ends of the axles protrude from the sides of the wheels in a D-shape.

The gap between the hub of the wheel and the axle is very small, and the two ends of the axle protruding from the hub are made into a D-shaped shape to match the D-shaped hole on the "axle head" of the fixing.

After the axle is ready, it is soaked in water for several days, and the axle head of the wheel, which has been expanded by heating, and the axle that has been soaked in water and softened by water are forcefully bonded into the lock and fixed.

After the two ends are tightened, a complete "barbell" is completed by adding fish oil accompanied by graphite powder as a lubricant at the joint part that rotates between the hub and the axle.

The place where the axle is connected to the carriage is cut down by a whole circle, and then two "rabbits" that run through the length of the carriage are stuck and the cut part is tied to the wooden board at the bottom of the carriage.

The reason why the connection between the axle and the carriage should be cut down is to prevent the axle from shaking left and right when moving and touching the carriage.

At the time of production, because the fish maw glue has not yet been made, the rattan binding method is used.

In the future, it can be fixed by using fish maw glue and falcon reinforcement in the production.

This simple bullock cart does not have a roof, but a 50-centimeter-high baffle around it, which is flush with the wheels to facilitate loading and unloading of goods.

With this horse-drawn ox cart, it will be much more convenient for the little Fuma to pull more goods and go to the quarry to pull the fired quicklime.

After setting up the carriage, the second brother of Jingang and his party of 10 people drove the carriage to the quarry.

This time, Wang Tian did not follow, he began to use straw ropes to pull out the location of the wall, and used the previously burned lime to mark two straight lines on the ground where the foundation needed to be excavated.

The width of the foundation of the fence is slightly larger than the thickness of the fence, so that even if the construction of the fence is deviated, it will not have much impact on the stability of the fence.

In the end, Wang Tian set the width of the foundation of the wall at 1.5 meters, and the reason why it was so large was because he remembered the thickness of the city wall in the Ming and Qing dynasties in China.

At this stage, it is enough to have a 70-centimeter-thick wall, but the foundation must be set aside first, and it will be better to expand it directly when the city wall needs to be thickened in the future, and there is no need to tear down and rebuild.

After the foundation to be excavated was marked, Wang Tian determined the location of the gate, and the gate was designed to be four meters wide, made of two two-meter door leaves, which can not only ensure the solidity of the gate, but also ensure that it will not cause inconvenience in the subsequent use.

The gate is wider, and the overall momentum of the tribe is stronger, in Wang Tian's tribe rise plan, the main thing is to use coercion and economic strength expansion, as a former soldier, he is not warlike.

After doing this, Xiao Fuma had already pulled back a cart of quicklime, and everyone also picked up a load of stones to build the foundation.

After that, the group divided into two groups, six people continued to pull lime and pick stones, and the remaining four people began to dig a pit in front of the horse to be used as a mixing tank for lime.

The excavated soil can be stirred with plant ash, fecal excrement, and animal offal, etc., and then used to make farm fertilizer, and the outside is sealed with soil and sprinkled with quicklime, which can be odorous and insect proof.

Although it is not possible to find crops suitable for large-scale cultivation at this time, the fertilizer for cultivation needs to be prepared in advance.

After the lime mixing tank is built, it can be filled with water as a moat, and Wang Tian at the gate plans to design a suspension bridge according to the ancient Chinese form, usually using the suspension bridge to enter and exit, and once attacked, the suspension bridge can be pulled up.

As a city like this in primitive times, it was almost impossible to conquer the tribe from the outside by jumping over its own moats, horse rejections, and four-meter-high walls, unless there was a Trojan horse event.

Because the tank was to be used as a moat in the later stages, it was excavated four meters wide and two meters deep, within a hundred meters of the crossbow.

Once the enemy wants to wade through the water to attack the city, it will become a living target for the archers on the city wall, and in the future, a square platform battlement with a side length of 1.5 meters will be built on the city wall every 10 meters.

Eight bed crossbows will be placed on top of the platform battlements, and if the enemy wants to use crowd tactics, they will fill the moat and not break through the first line of defense.

Once the walls are built, they will be a formidable fortress for the enemy, and it only takes ten warriors to defend them to support the women who can attack.

The Horde now has 39 adult warriors, and six more will join after the beginning of spring next year, bringing the total number of warriors to 45. There are currently 45 adult women, and the number will be increased by 5 to 50 next year.

The total number of adults in the tribe will reach 95. The strategic decision to launch an attack is according to the words of "The Art of War": "Ten will surround it, five will attack it, and if it is doubled, it will be fought, and the enemy will be able to divide it, if it is less, it can be defended, and if it is not, it can be avoided." ”

It means surround the enemy with ten times the enemy's strength, attack the enemy with five times the enemy's strength, fight once the enemy is doubled, disperse the enemy if the enemy is evenly matched, defend if the enemy is less than the enemy, and avoid fighting if the force is worse than the enemy's.

And around the Tianlong Tribe, if you want to find a person with a population 5 times that of the Tianlong Tribe, there is no one, let alone 10 times.

At this stage, the design of the wall is sufficient to deal with all threats, and after the wall is built, only warning devices are set up in front of the moat, and several two-meter-high braziers are erected behind the horses, and the braziers are filled with fish oil and dry wood as ignition materials.

At the time of the night attack, two patrol sentries on the city wall, after receiving an advance warning from the warning device, sounded the attack siren and used rockets to ignite a row of braziers behind the horses as illumination, and the enemy who wanted to attack in the dark would have nothing to hide.

Wang Tian explained his idea in detail to the witches who came to watch the construction of the wall.

After Wu understood it, he wanted to attack such a city described by Wang Tian, just thinking about it was terrifying.

Wu believes that no tribe should have done this to this extent.

According to Wang Tian's assumption, after the city wall was built, only 20 people were needed to defend it, so that the tribe could liberate at least 60~70 adult laborers.

These people will be able to carry out hunting, fishing, foraging for metals, food crops, clearing wasteland, boiling salt, and so on.

After the development of agricultural production, the productive forces will be further liberated, so that more people can leave agricultural production and engage in specialized handicraft manufacturing.

If this cycle continues, the wealth of primitive societies will continue to accumulate, and the level of civilization will be unprecedentedly improved.

Wang Tian didn't know how long this process would take, but as long as he started doing it now, he would reach it one day.

This is why he thought about the construction of this wall: to ensure the safety of the tribe first, and then liberate the social productive forces, and without increasing the total population, to obtain more labor resources, to create more wealth, so as to improve the civilization of the tribe.

After this step, the tribe could carry out a limited expansion, and the target of this expansion Wang Tian was fixed on the neighbors around the Tianlong tribe.

For example, the river tribe in the lower reaches of the cave river, in today's words, a powerful river tribe that stands across the main transportation channel of their own tribe is not in the highest interests of the Tianlong tribe.

The existence of such a tribe will be a great hidden danger to its own security and development, and it is one of the goals that Wang Tian prioritizes to eliminate.

Of course, the best outcome is to be able to take it through peaceful annexation, so that it can not only safely receive the population of the River Tribe, but also strengthen the power of the tribe without hatred.

It can also get a good reputation and establish the prestige of the Tianlong tribe, which makes it much easier to expand in the future.

A tribe that uses force to expand from the beginning will face increasing resistance. It is difficult to develop sustainably.

The expansion of primitive societies was mainly to acquire population, not territory, and in the primitive era of vast land and sparse population, too much territory was simply useless.

In the case of the limited population of the tribe itself, the more slaves it gets, the more timed bombs it binds to itself, and there is a possibility of backlashing itself at any time.