In the forest farm in the mountain behind the forest valley, a large area of black ironwood is planted, the number is less than 6,000, most of them grow normally, only more than ten years old, and there are nearly 1,000 soldiers of the wood, all of which are 50 years old.

Among them, there are more than 100 elite soldiers, and the witch disciples often give birth, and the trees are a hundred years old, and Mu Yu, as the patriarch of the Mu clan, also comes to the Ringu from time to time to use his own blood to train soldiers.

This is from the book of the Ministry of Forestry, I found a special trick, and the soldiers who are often fed blood are easier to blend with the master's breath, and are not easy to be snatched by others, and when they are controlled, they are more handy.

Lin Tuo came to the forest farm with a wood fire and helped him pick the best two hundred trees, but he shook his head and refused, the former expressed his puzzlement, but the latter did not speak, and walked directly into the forest and came to the middle of the iron wood forest.

I saw him raise his hands, and the invisible power began to spread, and in the blink of an eye, it swept through the forest, and then, the surrounding black ironwood began to grow and grow rapidly at a speed visible to the naked eye.

In the time of ten breaths, more than 6,000 black ironwood, all of which have become hundred-year-old trees, the wood fire has gathered its strength, and the two hundred trees in the middle have been cultivated intensively, and the branches and leaves have increased, and the annual rings have grown, and the higher the tree, the stronger it becomes.

From 100 years, 200 years, 300 years...... 500 Years ...... 700 years ...... In just half an hour, the two hundred black ironwood trees beside him have all grown into thousand-year-old giant trees, and their roots are three zhang wide.

Each black iron wood is a hundred zhang high, the branches are thick, indestructible, and it is surrounded by Lin Tuo's knowledge, and when he saw such an astonishing change, he was also shocked and speechless, looking at the young man in the forest in shock.

At this time, the wood fire was also quite expensive, sweating profusely, panting, and holding the giant tree next to him, Lin Lin hurriedly stepped forward to support him, sat on the ground, and it took a long time to recover some strength.

He patted the giant tree beside him, and said with a smile to Lin Tuo: "Don't bother to prepare the vehicle, I'll just control the tree soldiers and carry them over." ”

"You still control wood? No, you originally controlled wood, and you will still give birth? How did you do it so powerful?" Lin Tuo calmed down slightly, and the shock on his face lingered.

"Familiar. Mu Huo smiled faintly.

"I don't think I've seen you. Lin Tuo looked at his appearance and suddenly felt a little familiar.

"My name is Wood Fire. Wood Fire held out his hand.

"My name is Lin Tuo. Lin Tuo also stretched out his hand.

Clasp your hands.

Half a day later, five hundred thousand-year-old ironwood were prepared and piled up outside the valley, these were cut down and stored when the forest valley was occupied, and the material was extremely hard, the formal material was hard, and even the bronze axe was difficult to do.

There is not much use, the consumption is not obvious, in the warehouse of Lingu, there are still more than two hundred, the black iron wood is too hard and heavy, it is not easy to handle, there are a large number of sharp branches on it, it is not convenient to transport.

Ten flesh and bone warriors can only carry one, and they must be careful with the branches, careful to avoid scratches, but in the hands of the same hard and infinitely powerful ironwood soldiers, two of them can be easily tossed and played.

Before leaving, Lin Tuo pulled Lin Lin over, the brother and sister whispered, he said: "Lin, the wood fire is very good, you can follow him to have a baby, the old witch is old, you can't have a baby, and there are no offspring with him." ”

Hearing this, Lin Lin blushed and wanted to tell him that Muhuo was an old witch, but when he thought of Muhuo's mustard and his brother's situation, he fell silent, just nodded, and didn't say anything more.

Regarding the conversation between the two, Mu Huo was not interested, he only thought about the discovery in the forest, he had not carefully explored before, and this time relying on the enhanced exploration, he finally discovered the secret of the growth of the black iron wood forest.

It turned out that in the depths of the underground of the forest valley, there was a huge iron ore vein, and it was precisely because of the existence of the iron ore vein that this iron wood forest was fed, and there was no ore vein in the tribe to absorb it, so it was naturally not as hard as here.

The use of iron ore is much greater than that of bronze, especially in the wood-weather department with coal and smelting technology, but unfortunately, this iron ore is deep underground, with a depth of more than ten miles, and it is very difficult to mine.

The black iron wood forest in the forest farm also relies on a well-developed root system to barely absorb the aura of the ore veins, and there are thick rock layers in the middle, and the reckless and soil can't penetrate it, and the possibility of mining is almost zero, so it can be abandoned.

When Lin Lin came back, Mu Huo asked casually, "What did Lin Tuo tell you?"

"Brother let us have a baby. Lin Lin blushed, but what she said was very direct.

"Go back and give birth!" Wood Fire laughed loudly, pulled her on the wolf's back, and put his arm around her waist: "Go!"

The army of ironwood was opened, and the road from Lingu to Jinglin was completed for the most part, and the big wolf ran wildly on the road, and the wood fire controlled two hundred ironwood soldiers, carrying three hundred thousand-year-old ironwood, and ran on both sides of the road.

When the speed ratio came, it looked a lot slower, mainly because the speed of the tree soldiers was too slow, and the control range of the wood fire was limited, and after a certain distance, they had to stop and wait for them, which delayed a lot of time.

......

The older the Black Ironwood Tree Soldier is, the harder it is, the taller it is, the slower its speed, the lower its flexibility, and the movement speed of the Thousand-Year Ironwood Tree Soldier is even less than one-third of that of the Hundred-Year-Old Ironwood Soldier.

Thirty miles a day is the limit, the tree soldier needs to take root and rest, draw nutrients and water from the soil, wood fire also needs to rest, he needs to control the tree soldier, and the ability consumed also needs to be restored.

It took a month to come from the forest valley thousands of miles away to the outside of the Jing forest, and the warriors who carried the cables and tung oil had already arrived for many days, and rested in the tribe's camp for three days.

Returning the ability to its peak, the wood fire began to work, first of all, not to build a bridge, but to try, using the secret method of the green tribe, to control the thorns outside, trying to open up a path from under the thorns.

However, even if he surpassed the ability of the late stage and activated it all, he could only control the slow movement of the thick thorns in the tightly growing thorn bushes, opening up a narrow path.

How narrow is it? Barely able to walk into the Jing Forest, but not to curl up on his stomach, about five feet wide, for two people in normal form, side by side, the height can be one zhang, most people can pass.

But mounts and chariots are very difficult, and it is not convenient to carry things, and there are fine stingers on the thorns, which will get on the body if you are not careful, and even the warriors will be paralyzed, which shows the strength of the toxin.

For the warriors of the tribe, it is enough to praise the achievement, but for the wood fire, some are not satisfied, and when the ability is restored, they can once again use the tree soldiers to try to build a giant bridge over the thorns.

The thorn forest is fifty miles long, the giant bridge is eighty miles wide, the growth of thorns must be considered, it can't be used for a few years, the thorn forest expands, it is necessary to build a new one, and if it grows forty miles in two thousand years, it will be used for another two thousand years!

If you want to build it, you have to build a good roof! It is too long for the two sides of the strait to hold on, just like a suspension bridge built of wood, with 300 years of iron and wood as the shore, and only a layer of thick wooden planks is laid on the bridge, and the pressure faintly exceeds the ability to bear it.

It has only been built for less than five years, and there has been a significant displacement, and the number of soldiers crossing the bridge and the weight they carry must be regulated in order to slow down the displacement trend, so the wood fire replaced the material with a thousand-year-old ironwood.

The giant bridge should have 12 pillars, six on the left and right are built on the shore, three thousand-year-old iron and wood overlapped, slender roots and branches, tightly entangled into the same body, forming a giant pillar more than three zhang wide, far more than the soil and stone mixture.

The six giant pillars in the middle are built in the thorn bush, separated from the two sides by two hundred miles, leaving a space of four hundred miles in the middle, and the wood fire stands on the suspension bridge, controlling the thorn bush to crack the hole, and the giant pillar itself enters the gap and takes root.

Worried about the green python on the thorns, it attacked the giant bridge along the giant pillar, and the thousand-year-old ironwood on the top deliberately controlled the growth form, and grew dense large branches, and the branches were eliminated into spears, which were much sharper than steel tips.

The big guy doesn't want to come up, and even if the little guy sneaks up, it's just adding food to the tribe, just pay attention to it regularly. Three giant pillars are arranged in a row, leaving two gaps to pass through, each with a width of five zhang.

Three thigh-thick sisal cables are used as the skeleton of the twelve giant pillars, and the three giant pillars arranged in four rows are also connected to each other by the same cables, and then the arm-thick cables are connected back and forth in the four rows.

The middle three cables are extended backwards, and one mile away in the rear, three overlapping pillars are laid out, and then one mile back, three giant pillars of individual soldiers are laid and their heads are tied, and then they are extended one mile back to tie their feet.

In this way, on both sides of the bridge, a gentle slope with a length of three miles and a height of three hundred zhang was formed for chariots and mounts to pass through, which not only facilitated the passage of the bridge, but also strengthened the bridge deck in disguise and shared the pressure on both sides.

Finally, with 20 zhang long thousand-year-old ironwood thick board, densely laid on the surface of the cable, the thickness is generally five feet, and then a layer of cable is pulled on the top, the two layers of cable are firmly entangled with the plank, and the surface is covered with thin planks.

It is the basic composition of Jinglin Bridge, the production is quite cumbersome, the material also has requirements, the cable used should be soaked in tung oil to ensure toughness and corrosion resistance, and the wooden plank should also be smooth, and it will not be awkward to walk on it.

There is no need to bake, the black iron wood is hard, even insects and ants are difficult to bite, the water only exists in the bark, it is too hard, it is difficult to process, and the wood wood borrowed the meteorite battle axe, and the tree soldiers split the rough plank.

Then it was handed over to the warriors of the tribe to use fine bronze utensils for more detailed processing, the tribe had many people and sufficient labor, some of them had people to help, and the wood fire had skills and enough ability.

It only took a month to build the basic framework of the Jinglin Bridge, consumed 60 thousand-year-old ironwood soldiers, and in half a year, the materials were also processed and the bridge deck was spliced.

The work on the bridge deck lasted for a year, and the delicate and meticulous work, the tree soldiers could not help, and the top layer of thin planks was laid, and a layer of triple soil was laid again for fire prevention, and the rope nets on both sides were pulled up to prevent them from falling.

It was kept at a distance of fifty or sixty zhang from the top of the thorny jungle below, and when all the work was completed, it took half a year to dry, and it took two years for the Jinglin Bridge to be completed.

At the same time, the wood fire is also on both sides of the bridge, opening two safe passages, Jinglin Bridge is good for everything, but it can't be caught in fire, it will burn when it encounters fire, and those special fuels will be transported through the channel below.

One bridge and two holes in parallel, a steady stream of combat materials, transported into the Jing forest, the mounts also along the bridge into the inside, convenient for the flow of people inside and outside, the domestication of the Qing tribe slaves, followed by the speed of speed.