"Prison History, further along, it will be the last barrier of this trip." The black-clothed official ran to the front of the car to report.

Supervisor Shi Linglu nodded, folded the bamboo slip on his lap, and asked, "Which captain's camp is this?" ”

"It's Captain Li Youdu, who is in command of the soldiers and people of Nanjun, and sent the military secretary Kong Zhanghan to supervise the work."

"Li You, Zhang Han?"

Linglu pondered for a moment and said secretly: "Li Younai is the son of Li Si, the court captain, and he became the chief of Zuo at a young age, in charge of the military affairs of a county, and was pinned on by the king. And Zhang Han is an official of the Shaofu, and he is also known as a capable person. ”

"I don't know if there is any difference between these two people and the corner towers they have built?"

Turning his head on the car, Linglu could clearly see that on the horizon of withered grass and trees, there was a barrier that was more than a foot high and stretched for hundreds of miles. It is like a yellow curtain, artificially dividing the Huaibei Plain, with Qin to the west and Chu to the east. And every hundred paces, there was a corner tower more than two feet high on the rampart, with drums and flags on it, and a company of heavily armed soldiers with crossbow machines stood vigilantly on it.

This is the fifth day of Linglu's departure, he was originally the supervisor of the imperial history, subordinate to the imperial history office, and was arranged in the county, responsible for supervising officials, and reporting directly to the king of Qin, together with the county lieutenant, to curb the county guards with great power.

At the same time, the supervisor of the imperial history also had the responsibility of supervising the administration of the county and discovering talents in the local area to recommend them to the central government, and in wartime, Linglu, as the "Chen County Supervisor Imperial History", had to be transformed into a messenger of Wang Jian to supervise the progress of the project and canal transportation on the front.

The whole fortress is divided into 30 sections, basically each section is 5 to 10 miles long, and one mile of the Qin State is 300 steps, so three corner towers must be built in each mile.

Along the way, Linglu was not very satisfied with the quality of the entire project, perhaps because of the soil quality, in his eyes, these hurried barriers and corner towers were really poor. Corner towers, in particular, require a stronger rigidity than a barrier. But Linglu let people chisel and peck with the spear in their hands, and a large piece of rammed earth on the corner tower can fall down, and some military commanders build corner towers with adobe, mixed with straw and branches to increase the strength of the bonding, which barely passed.

"But if the Chu army comes to attack and destroy this corner tower with flying stones, it is still not a difficult matter!"

The so-called flying stone, is the catapult, in Wu Yue when the hegemony was made by Fan Li, has been the siege of the city and the fortress battle commonly used equipment, against the thick city wall effect is average, but it is the nemesis of the corner tower watchtower.

Linglu can imagine that when the Chu army came to attack in a big way, it only needed to send a flying stone weighing ten catties over, hit it several times, and the fragile corner tower collapsed......

Therefore, he was very strict with the quality of the corner tower, punished several military officers in succession, and asked them to take the people to re-strengthen the corner tower.

Along the way, the overseer, who knew a lot about civil engineering, had a gloomy face, and it was not until he arrived at the southernmost section of the Nanjun soldiers that he showed a look of surprise.

The barriers that the people of Nanjun were responsible for were no different from what they had seen before, but the more than ten corner towers, only after seeing them from a distance for the first time, Linglu found something unusual about them......

Looking at the red yellow turrets from hundreds of paces, they were tall and thick, and when they got closer, Linglu found that their bottoms were stacked with large pebbles or stones.

"This is to prevent rainwater from soaking and making the foundation of the corner tower unstable." The military secretary in charge of this paragraph, Kong Zhanghan, hurriedly greeted him and explained on the side.

"Dry building with pebbles, won't it be pried open?"

A small official beside Linglu asked, but Linglu glared at him: "Could it be that you didn't see that these big pebbles were deliberately turned inward and outward?" ”

Linglu is not a layman who doesn't know anything, on the contrary, he also worked in Shaofu for a while, and even participated in the excavation of Zheng Guoqu.

He knew very well that it would be extremely difficult to pry open the large pebbles from the outside after the foot of such a masonry wall had been pressed against the heavy rammed earth wall.

Sure enough, after a few people pry with shovels for a long time, the pebble foundations are not moving......

With such a corner tower foundation, even if the Chu army came to the front and wanted to quickly pry it up with a hole attack, it was not easy.

Linglu was quite satisfied, raised his head again, and touched his hand towards the outer wall of the corner tower, which was hard and dry, this was the most surprising place for him, the appearance of the corner tower looked like a stone, and it was more tough, so that people could smash it with iron tools, and it made a sound of gold and stone! You have to work hard to break the wall, where can you get such good soil around here?

"This is the triad soil."

Zhang Han explained his doubts and invited a black-faced leader over: "We also used ordinary loess to ram at first, but due to the poor soil quality, the corner towers built are fragile, but fortunately, Heifu taught me how to build houses in his hometown......"

"Oh?"

This is fresh, Linglu is interested, and let Heifu and Zhang Han explain it in detail.

"With the common loess, plus the fired mirage, river sand, mixed together, this is the triple soil."

Heifu is easy to say, but the project in the past half a month has not been easy, first of all, the people have to pound the loess finely, ferment it, and become cooked soil, and then dig up fine river sand from the nearby river, across several miles of distance to transport it.

This is nothing, the most troublesome is the firing of "mirage". Mirage ash is also known as oyster ash, and the oyster shell is calcined to obtain a product similar to lime. From building palaces and bridges, to building houses and ditches, this material will be used, and it is said that it is more prosperous on the coast of Yanqi.

Although common sense tells Heff that firing limestone can definitely get a similar product, where to find limestone everywhere on the front line? In any case, there were only a dozen or so corner towers that needed to be built, so some were fired from the oyster shells of Rushui and its tributaries in the traditional way, and because of the limited quantity, these mirages only accounted for one-fifth of the proportion of Sanhe soil.

After mixing the three together, it is constantly beaten and turned with a mallet, and then stacked and parked for a period of time to fuse and ferment, and after a few days of rest, it can be used as a building material.

The process of construction, is still the version of the rammed earth, but to continue to sprinkle water and wet ash alternately rammed, so that the triple soil is consolidated, but also added some gravel reinforcement, after thousands of people half a month of labor, only to create the solid corner tower in front of you, has better performance than the general corner tower.

The more Linglu listened, the brighter his eyes became, and finally with a wave of his hand, he let people handle the catapult that sent flying stones in the army, and smashed it towards a corner tower built of three-fold soil!

The accuracy of the flying stone weapon was very low, but I saw that the first blow was high, and it was able to fly over the edge of the corner tower, and the second blow was also crooked, until the third blow, the stone weighing more than ten catties hit the middle of the corner tower!

The corner tower is different from the city wall, the flying stone is its nemesis, if it is an ordinary corner tower, it must have collapsed a large piece, but the corner tower built of this triple soil has not moved at all, and when everyone rushed to the side to take a look, they all gasped, it turned out that the stone only smashed off the palm-sized wall skin, leaving a small groove......

Heifu's hanging heart finally let go, although because the proportion of lime is not enough, the strength of this three-fold earth corner tower is far less than the earth tower he saw in later generations, but at least it has withstood the test.

In his previous life, his hometown was in the south, and there was an ancient earthen building in the town, which was built with three-fold earth. I heard that in addition to loess, lime, and river sand, it is necessary to add glutinous rice soup, egg white, shell powder, gum, brown sugar and other things.

In his previous life, Heifu had heard some old people say that in the early years of the war, someone tried to break the building with a cannonball, but the result was a shot, but he only knocked out a few small pits in the tulou. In that special decade, someone tried to demolish an earthen building, but the knives, guns and sticks were all in battle, but they didn't open it, and finally it was blown up with dozens of kilograms of explosives before a piece collapsed......

It can be seen that its strong resistance function can be said to be unprecedented in this era! With the strength and accuracy of the catapult stone, I am afraid that it will take more than ten planes and half a day to destroy one.

However, there are advantages and disadvantages, the biggest problem of Sanhe soil is that the cost is too high, even if there is no glutinous rice soup, egg whites and other things, it is still two or three times that of ordinary corner towers......

So, when Linglu Xiao asked them with interest how much manpower and time they had spent, Zhang Han and Heifu also cleverly asked Linglu for guilt: "Dare to speak out in the history of the prison, these more than ten corner towers, the man-hours and manpower spent are more than ordinary corner towers......

Linglu didn't care: "The corner tower is used to defend against the enemy, what is the use of the corner tower that will collapse in one blow?" ”

"General Wang ordered us to defend the wall, what is a strong wall?" He once again patted the corner tower made of triple earth with affection: "This is called a strong wall!" ”

He changed the haze on his face for several days, praised Heifu and Zhang Han, and said that he would ask General Wang for credit for the two of them! Zhang Han also glanced at Heifu, quite grateful.

"This three-fold building is simply indestructible! If it can be extended to other places......"

As a supervisor from Xianyang, Linglu knew that what King Qin wanted should not only destroy Chu, but also in one day. Those places around Kyushu that seemed to be barbaric and barbaric, the king also showed great interest when he looked at the books.

"Wherever people go, there are no subordinate!"

This sentence sounds so chilling and exciting.

The role of the corner towers and fortresses rammed by these three layers of soil in this battle to destroy Chu is actually very limited, but the future prospects are very promising!

Linglu thought far ahead, but at this moment, a fierce drum beat shattered his contemplation!

"Knock knock knock!"

The drums beat rapidly, sounding from the corner towers, deafening! The soldiers above are still holding flags and shaking desperately!

The people were a little flustered, and the Qin pawns who had been waiting for a long time in armor on the side couldn't help but lift their spirits!

"Light the Beacon!"

At Heifu's orders, the soldiers immediately lit the dry dung and firewood prepared on the corner tower, and the smoke billowed and drifted obliquely into the clear winter sky with the north wind......

Soon, the two-hundred-mile-long Qin army barrier, countless black smoke rose from south to north, telling hundreds of thousands of Qin troops along the line a message:

"The Chu people are here!"

PS:I'm going to think about the follow-up plot for a while tonight.,So there's a make-up tomorrow.,By the way, because there's another alliance leader.,At present, I owe back 8 chapters%>_<%.