Two days later, another expedition boarded the ship and set out for a tribe of less than 300 people on the eastern bank of the Yanbao tribe, a little north of the Yellow River's tributary.

It was an easier battle than the conquest of the Leopard Tribe, with no one dead or wounded, and the conquest of the tribe at a pitiful cost of little, and at the end of the battle, the total population of the Dragon Tribe increased by two hundred and one people, including eighty-three adult women, and thirty-seven large slaves and thirty-six minor slaves.

This year's third foreign campaign is over, autumn is coming, this year's campaign tasks are all over, and the foreign campaign will be resumed only when next spring arrives.

I have to say that this year's three consecutive foreign expeditions, the dragon tribe has developed one step closer, and the population alone has increased by more than 3,000 people, nearly half of whom are adult female clansmen who can work.

There are also more than 700 slaves, and such a large number of slaves directly frees the Dragon tribesmen from the heavy mining work, leaving only the slaves in the mining, and then sending a team to guard them.

With so many slaves producing a large amount of copper ore every day, the copper ore is produced at a much faster rate than the smelting area.

Thinking about it, when Su Yan has decided to build the fourth city next year, he will mobilize a group of slaves to participate in the construction of the city, which may be sent directly to the fourth city, or it may be sent to the three cities on the north bank of the Yellow River to dig earth and make bricks.

If the slave can understand the dragon language, the slave can also participate in the spring ploughing, after all, plowing the field with manpower is a technical job, and if you can't understand the dragon language, it is slightly more difficult to teach the slave to plow the field with manpower.

The remaining two A-type ships in the shipbuilding area were launched one after another, and the number of A-type ships owned by the Dragon Tribe has reached nine, and the nine ships shuttle back and forth in the waters between the three cities of the Dragon Tribe and a city that is about to start construction, which greatly facilitates the communication between the cities.

The only bad thing is that the Yellow River and even its tributaries will be frozen in winter, making it impossible for boats to pass and unable to walk on the ice easily, so as to prevent people from falling into dangerous river water if the ice surface is not strong and directly breaking, which means that in winter, the connection between the north bank of the Yellow River and the south bank of the Yellow River will be broken.

Before the autumn arrived, Zhi and his people returned from the construction area of the fourth city, and after a few busy months, the dock had been built there, which could dock three A-type ships at the same time.

Not only the docks, but also the residence of the Blood Tiger Tribe has been reorganized and temporarily used as a living area, where the clansmen will live for a few months and next year when the city is built.

During these months, the most work was to accumulate materials for the construction of the city, mainly to burn the turns, and then to cut down a number of trees.

During this period, Su Yan took a boat twice to the construction area of the fourth city, and after discussing with Zhi, the two worked out a plan for the construction of the fourth city.

When the first three cities were built, one city was built faster than the other, and it took two years for the source city and only one and a half years for the bamboo city.

The fourth city, with a construction time of one year, can accommodate 5,000 people after completion, and with the number of labor of the dragon tribe, it is fully capable of completing this plan.

On the one hand, a large number of clansmen and some efforts can be sent to work on the side of the fourth castle, and on the other hand, the three castles of the source castle Akagi and Bamboo Castle can also be supported by the construction of the fourth castle, and the fired heads can be transported by boat by water.

In this way, the time to build a city can be greatly shortened, and it is not a problem to complete the construction in one year.

Zhi returned with people, and the autumn harvest began, and this year's rain was average, which can be regarded as a bumper harvest year.

Last year, 40,000 mu of millet, 6,000 mu of hemp, and 6,000 mu of soybeans were cultivated, and a total of 2,100 tons of corn, nearly 250 tons of hemp seeds, and nearly 300 tons of soybeans were harvested.

This year, a total of 60,000 mu of millet, 9,000 mu of hemp, and 9,000 mu of soybeans were planted, and a total of 3,200 tons of corn, 380 tons of hemp seeds, and 440 tons of soybeans were finally harvested.

Calculated down, the average adult clan can get about 600 catties of grain, and last year the average adult clan was able to get about 570 catties of grain, the crop planting area increased by half, but the average to each person only increased by 30 catties, the rapid growth of the population of the dragon tribe is the biggest reason.

However, an increase in population is always good for the Dragon Tribe, the Dragon Tribe needs more population, if the population of the Dragon Tribe quickly reaches 50,000 or 100,000, Su Yan will be even happier, but if you want to achieve this population goal, even if you continue to fight abroad, it will take many years to complete.

The problem of food is only a minor problem, at present, the tributary of the Yellow River on which the three cities of the Dragon Tribe rely are about to reach the upper limit of the population, Su Yan does not plan to build a new city on both sides of this tributary of the Yellow River in a short time, and the fourth city is directly adjacent to the main trunk of the Yellow River on the south bank of the Yellow River.

The Yellow River, which is more than 200 zhang wide, has more swimming fish in the water, which can feed a larger population.

Of course, as the population increases, the best way is to increase the area of arable land, and the carpenters have been building man-powered plows this year, and by the time they plough next spring, the number of man-powered plows will reach one for every four people.

Two people can use the manpower plow, the other two sow seeds and soil, and the two people who use the manpower plow can change shifts to sow seeds and soil, so that the efficiency of cultivating the land can be increased a lot, and the number of manpower plows is still a little less when plowing this spring.

By the way, there is also a bull power plow, Su Yan has a good way to train the cow, that is, to add a nose ring to the cow, even a child can use the rope tied to the cow's nose ring to lead the ox away.

In "Lü's Spring and Autumn Period", it is recorded that the strong man Wu Shu pulled off the tail of the ox, but the cow did not move, and a child led the nose ring of the cow, and the ox obediently followed him.

In the late Spring and Autumn Period and the Warring States Period, it was learned in practice that the nasal septum of the cow was thin and full of nerves, and as long as the nasal septum of the cow was held and stimulated, the ox could feel pain and obediently obey, and concluded that the ox could be led by using a metal ring through the nasal septum and putting a rope on it.

There are still relatively few cattle in the dragon tribe, but dozens of cows can also save a lot of effort for the tribesmen, and the ox power plow has been built, which only needs a big cow to pull, and now each big cow can "get" a cow power plow.

Su Yan also selected more than 100 tribesmen to drive oxen-pulled plows to plough the land, and it is expected that the ox-powered plough will be put into use next spring.

More labor, manpower plows, ox-powered ploughs, and the area of land cultivated by the Dragon Tribe will exceed 100,000 mu next year.