Liu Shisan, Qian Bao and Li Goudan were ordered by Su Yi to take the captives and Jingzhuang to repair the southern barren forest. Fortunately, the South Barren Forest is deep and narrow, and the Hu people of Yongji Canal know that there are bandits in the South Barren Forest, and it is common for these ferocious bandits to kill each other, so they don't care much about the movements on this side of the South Barren Forest.

Su Yi repeatedly told Qian Bao and the three of them to pay attention to secrecy, strictly prevent Hu people from sneaking into the southern wilderness forest to find out the news, and sent Zhang Hongsheng to take full charge of this matter.

If you want to trim the southern barren forest, the amount of stone is indispensable, there are many rocks in the vertical and horizontal mountains, and Taohuazhai is not short of labor, and Ah San, who has been in charge of supervising the work in Taohuazhai, specially took the captives to open the mountain and quarry.

This Ah San betrayed Gao Heihu and the others at the beginning, and when he saw Qian Leopard and Gao Heihu, he subconsciously avoided them. This time, Su Yi arranged for him to take the captives to mine stone and assist Qian Bao and others in repairing the southern barren forest, and Ah San suddenly became sad.

Not only is there a lack of stone, but the amount of wood is also indispensable, but fortunately, Ah San has been in charge of this kind of work, and under the command of Su Yi, he took a group of captives to transport the stone and timber in the cottage warehouse to the Southern Wilderness Forest, and then mobilized people to start cutting and quarrying.

Su Yi's original intention of taking the South Wilderness Forest was to facilitate the delivery of grain from Yongji Canal to the cottage in the future, so the road leading from the cottage to the South Wilderness Forest had to be paved, and the amount of work involved was quite large. Ah San led the men to cut down the trees on both sides first, opening up a wide mountain road.

Then Qian Bao and the others began to prepare to build a wide road, the southern barren forest is full of barren mountains and strange stones, if you want to repair this road, you can't do without the quarrying work of Ah San and others. Fortunately, a large amount of wood and stone is needed to cultivate the southern wilderness forest, and these quarried stones and trees are just the right thing to use.

This road from the South Barren Forest to the Yongji Canal, Su Yi is going to pave the stone and build a smooth stone road, so that it will be much more convenient to transport materials in the future, not to mention, the road is also conducive to the troops stationed back and forth.

It's just that in this way, the workload of Ah San and others has increased a lot.

It is not enough to build a road, at present, the Yongji Canal is still in the hands of the Hu people, and some fortifications must be built in the southern barren forest to prevent these Hu people from infiltrating the vertical and horizontal mountains from the southern barren forest.

Originally, there were a group of barren mountain thieves in the southern barren forest to resist the Hu people, but now that the barren mountain bandits have been exterminated, if Taohuazhai is stationed in the southern barren forest, it will undoubtedly decompose the large number of troops in the cottage, Su Yi will naturally not do this, so it is imperative to build fortifications.

After Su Yi and Lu Feng and the others discussed, they decided to build a fortress and city wall along the edge of the southern barren forest at the end of the Yongji Canal. The terrain of the southern barren forest is complex, and it is not easy to build a city wall in it.

Lu Feng is an officer, and he has a very good set of research on fortifications, he suggested that Su Yi use thick soil to build under the city wall, that is, a retaining wall in the traditional sense, although this suggestion is feasible, but the city wall built in that kind of barren mountains and wilderness may not be very strong, Lu Feng suggested that Su Yi build some ramparts and fortresses behind the city wall.

The first wall was built on a raised hillock, and after collapsing back and forth no less than ten times, a fairly solid earthen wall was erected, and some stones were piled up around the earthen wall, and it was barely arranged into a wall.

Su Yi had another batch of bamboos cut down, sharpened the bamboos, and arranged them in the middle of the second wall, and at the same time asked Ah San and the others to make some horses and place them between the first and second walls.

The terrain of the South Wilderness Forest is complex, it is not easy to build the arrow tower, the reason why the South Wilderness Forest is called the South Wilderness Forest, one of the reasons is that the trees are luxuriant, and there are many towering trees in depth, and some places do not shine in the sun all year round because of the relationship between the trees covering the sky, so it is damp and dark.

Unable to build an arrow tower, Su Yi, at Lu Feng's suggestion, had more than a dozen mounds built, these mounds were about more than one person high, and they were built into a cylindrical shape with stones, and up to four archers could squat inside.

These mounds are not far apart, and if an archer in one of them spots an enemy, they can immediately warn them.

He Yuan was born as a hunter, and before he fell into the grass, he, like He Kui, was a hunter who jumped in the woods all year round, and was the best at climbing trees and arranging traps. He made a suggestion that there are many towering trees in the southern wilderness forest, which are not only thick but also surprisingly tall, and some tree houses can be built on these towering trees.

Some large trees are as thick as two or three people hugging each other, and it is not difficult to build a treehouse on top, but for some trees that are a little thinner, pick up two or three trees that are not too far apart, and work together to build a treehouse on top.

These treehouses are covered by dense foliage, and some archers are usually placed in the treehouses, and it is generally difficult for the enemy to detect their whereabouts, which is a natural sentry.

In the southern wilderness forest, not only a stone road should be built, but also a barracks should be built for the stationing of soldiers and daily drills, and some main roads and carriageways for carriages and horses should be divided for daily walking.

He Yuan was born as a hunter, and when everything was completed, Su Yi would arrange for him to take some archers to lay traps in the southern wilderness forest. And Su Yi also planned to dig some caves in it to arrange ambush soldiers.

If you want to garrison the army in the South Barren Forest, the water source problem must be solved, the original barren mountain thieves dug some wells in the South Barren Forest, Su Yi led people to carefully investigate, some of these water sources are seriously polluted, Su Yi asked people to fill in all the seriously polluted water sources, leaving those water sources that are still clean and clear, these water sources are responsible for solving the daily water supply problem of the South Barren Forest garrison.

To build a city wall, you have to find a way to lay the foundation, the first city wall is not so much a city wall, but an earthen wall, which is reluctantly erected, and the second wall, Su Yi's requirements are much higher, the stone used for the wall is required to be solid, not easy to weather, the kind that is not easy to weather, and the hard bluestone is the best.

The repair work of the southern barren forest was in full swing, and Youzhou still did not assign Su Yi a place to station, Su Yi only took Zhang Huan and Zhou Fei to Youzhou to visit Liu Yu once according to the custom, but he didn't even see Liu Yu's face.

Since the matter between Su Yi and Pei Wen caused a stir in the imperial city, Pei Mansion and Qi Wangfu did not dare to send people to rob and kill Su Yi openly, but it was not ruled out that they would secretly send some killers to ambush Su Yi.

Therefore, Su Yi only appeared once in the Thorn History Mansion, and then hurriedly returned to Peach Blossom Village with Zhang Huan and others.

Due to the good secrecy measures, the repair work of the South Barren Forest did not alarm those Hu tribes, and it is not surprising that in more than three months, the South Barren Forest should be almost built, which is two months faster than Su Yi expected.