The Chen people, who were ordered to dig tunnels and build sheep mounds, did not know the true intentions of the king of Chu and the nobles, and in their opinion, this was just a normal way to attack.

It is impossible to build directly under the city, so you can only choose to start outside the range of the feather arrows in the city, pile up forward little by little, and constantly use the condescending advantage to rely on the archers to suppress the city head, and gradually approach.

This is the most stupid method in the eyes of the Mo family, but the so-called big ingenuity is not worked, if it is really successful, it will cause huge pressure on the city wall.

Digging tunnels is also a common and extremely useful method for the besieging party.

Instead of digging tunnels directly into the city, the rammed earth wall foundation near the city wall was excavated and the city wall collapsed.

If this method is combined with gunpowder, it is almost an insoluble siege method for the city walls of this era.

However, the Chu people did not talk about gunpowder, and even iron tools could not be prepared, and many apprentices still used the most stupid methods to dig.

Fortunately, there are also many craftsmen on the Chu side, either in the copper mine or in the rest of the mines, and this kind of thing can still be done.

Most of the Chen people who were excavated were people who had listened to the propaganda of the Mo, and there had been a strict order before, and the words of the Moji were all nonsense, and it was forbidden to spread them in the barracks.

There were people behind them, and these people were worried that someone would tell them, so they didn't say anything, but kept digging according to the command, trying to get close to the city wall.

…………

In the city, a blind man crouching at the mouth of the well, listening to a pottery urn covered with cowhides, suddenly moved his ears, held his breath, and his heart pounded.

He was blind, and he was originally unknown in Shangqiu City.

But this time, the Ink Maker recruited those with a keen sense of hearing, not only could they eat wheat cakes every day, but they also had a bounty to receive if they could detect the enemy's movements.

If it was said by the princes and nobles, the blind man naturally didn't believe it, and many nobles would make such jokes, just to laugh.

But if it is said by the ink man, the blind man will believe it without even thinking about it, and he will be sure that his hearing is excellent, and he may be able to get those bounties.

The blind man has never touched the real gold, nor knows the weight of the gold, but he has heard of the preciousness of the gold.

These gold are not from the ink man, but the ink man will give it as a guarantee to the Song Gong Association in the future, at least the blind man believes in the ink man.

The blind man felt that his wealth was in front of him, and listened very carefully.

The subtle sound propagated through the land, amplified at the mouth of the well, and then magnified here in the urn, vibrating on the cowhide above, like a great stethoscope, in which these blind men with keen ears could discern the direction.

The blind man coughed lightly, and immediately an inkman came over, holding a ruler in his hand, determined the direction on the suitable orientation plate next to him, spread a straw silk, and quietly waited for the blind man's guidance.

The perennial dark life has allowed the blind man to practice the ability to listen to voices and defend positions, not only to hear sounds, but also to discern directions through sounds.

It was not the first time that the inkman next to him had followed these blind men to listen to the movements, but it was the first time that he had followed the instructions of the scribe to set the direction with a ruler and draw the direction on the straw.

In the past, it was relied on the blind man to hear the movement and use different wells to determine which well was the closest to each other, so as to determine the location of the enemy's hole in the ground.

But this time, Shi said that he could not only judge the direction of the position, but also roughly determine where the enemy's tunnel had been dug.

Most of the ink writers believe this statement, they are too lazy to be shocked, but they don't know what to do.

Since the giant also believed it, then they had no choice but to do it.

Dozens of paces away, more than a hundred paces away, those blind men with sharp ears heard different movements, and those who followed the ink also drew these movements on the grass silk one by one, marking the directions.

In a large room, Shi Zheng and some of the scribes, as well as a few carpenters, were busy making some measuring tools.

On the large piece of paper behind him was a simple map of Shangqiu, marked with various signs outside the city.

Enemy watchtowers, boulders left behind by inkmen to measure distances, rivers, iconic fields, hills that can't be leveled, and more.

On this map, there are strange little squares used to measure distances, and there are thin lines drawn on them.

Shi Zheng and a few carpenters tried to make a small level, and a semi-circular scale board to calculate the angle in order to calculate the distance.

These tools have never been seen before, but they are extremely simple, and the difference is only a trigonometric table, which unfortunately requires a lot of people and a lot of time to get this thing out.

Fortunately, the ink man must be used to defend the city, otherwise the cannon will not be able to get out, and the development of trigonometric functions will not be so fast, and sometimes war is really one of the driving forces of mathematics.

What can be done now is only to use the method of approximate calculation by measuring the ruler to calculate some sine cosine and so on with a large error.

When Shi was busy, a Mo man walked in with a giant warrant, whispered a few words in Shi Zi's ear, and Shi followed out and came to Mozi's military tent.

Inside, the ink masters gathered, guessing that something might be wrong.

After the unrelated people withdrew, Mozi smiled and pointed to the outside of the city and said, "The Chu people rely on building sheep mounds to cover them, but they are actually digging tunnels to attack the city. Shi had said before that the Chu people might pretend to attack the city to cover the wheat harvest, but it seems that he was right. ”

Speaking of this, Mozi was a little dissatisfied, and sighed: "More than thirty years ago, I fought with the Gongyi class in Chudi, and I have already said this method of digging tunnels and attacking the city. ”

"It is said that those people who listened to me back then still have those who have never died, how can they dare to attack the city like this? This is something that I am not happy about. ”

Everyone laughed, and they could understand Mozi's dissatisfaction: I had already warned you that it was useless to do this, and you still did it, which clearly did not take my words seriously.

This kind of extremely proud dissatisfaction.

Mozi shook a few pieces of paper in his hand and said, "Sui, you can come." This is according to what you said, draw out the direction that the Chu people heard when digging the tunnel, and you have to figure out the location as soon as possible. ”

After receiving those few pieces of paper, there are enough samples, and the intersection can be roughly judged in advance by finding the intersection by connecting the wires.

Gong Zaoye said with a smile: "Mr. once said, Ying Kou, urgent acupoint." If you haven't gotten the hole, be cautious and don't chase it. ”

"Before the enemy's tunnel is determined, the defender must not dig in advance, one is easy to hear clearly, and the other is easy to dig in the wrong direction."

"I once defended the city with my husband, and when the enemy was just digging, it was difficult to be sure, but if you could, you would have made another contribution."

If these six words are not done well, it is likely that the enemy's caves have been dug over, and this side has not been fully prepared.

If you don't prepare a little bit in advance, you can have an extra advantage.

Mozi listened to Gongzaoye's words, but said with a smile: "The appropriate merit has already been established, but how can it be now?" It's just that his work is mostly hidden, but I, a giant, can see it. ”

"Nowadays we have shovels, shovels, shovels and other iron tools, and it is very convenient to dig up the earth. Thinking that the Chu people may not all use bronze tools, the speed of excavation is very different. ”

"It's just that ordinary people would notice such a merit?"

Gong Zaoye bowed and said: "What Mr. said, the disciple understands. Exactly. ”

Shi was humble for a moment and said, "Sir, since you can prepare in advance, how is Sir, going to deal with the enemy digging tunnels?" ”

Mozi didn't have any pressure on Shoushang Hill, so he took this opportunity to pass down many of his skills in defending the city.

The appropriate people have only heard of it, but after all, they don't have a good grasp of some details as well as the birds who stayed in Pei County.

It turned out that Mozi had a lot of means to deal with the underground siege.

Broadly speaking, there are four types.

Small groups of elites raid in the tunnels; smoked by poison; irrigation with water; Shoot with a short crossbow.

The short crossbow is made by the ingenuity craftsmen of the Mo family, and it is most suitable for use in such a narrow place in the tunnel, the rate of fire is extremely fast, but the power is not great, and most of the tunnels do not wear armor.

After listening for a while, he said: "Sir, if the Chu people dig through tunnels, if Mr. is confident in breaking this method, he might as well use some other means." ”

"If you are in the tunnel, the people of the Xuanyi Department will also follow and advance, and make the enemy escape by using smoke, but before escaping, they will say some more reason."

Someone questioned: "Yes, your reasoning is for those who are farmers and businessmen, but not for scholars and nobles." If the tunnel is dug up, the first to attack it may be the scholars and nobles. ”

Shi laughed and said, "But now we have iron tools and nine-digit geometry to predict the direction of the enemy's digging in advance, so as to take the lead." ”

"Before the tunnels are dug well, how can the scholars and nobles dig them themselves? The people who excavated were either slaves from the mines or conscripted farmers, and these people were exactly what the Xuanyi Department could reason with. ”

"So ......"

He glanced at Mozi and said with a smile: "Sir, if you can intimidate and scare them away and smoke them away without having to kill them, first, you can let these people talk more about the righteousness of Mozi when they go back, and second, you can also make the Chu people no longer dare to use the method of digging tunnels." ”

"They may not be afraid of death, but they must be afraid of the living who are full of words of land, silverfish, nobility and the like."

Mozi laughed and said, "Good! Then smoke it. ”

He shouted the name of an ink craftsman and said: "The potter is moonlight, two feet five inches and six girths long, and he is judged in the middle of it, and in the cave of the combined application, it is one and one is covered." Outside the pillar, the perimeter is painted, and the Fu pillar should not be burned. Do not burn the pillars. Zhu is good at painting its sinus, do not let it leak. This is true on both sides, and in front of the caves. Under the force, put Kang Ruo in the ashes, do not be full. Gray Kang has five sinuses, both left and right, and is similar. **The mouth is the stove order such as the kiln, so that the seven or eight members of the Ai, the left and right sinuses are the same, and the stove uses four swords. The acupuncture points are encountered, and the drums are smoked, and those who are accustomed to things must not be ordered to leave the stove. Even the version, to the height of the acupoint, wide Shaanxi as the degree, so that the acupoint and the version of the front, chisel its version of the Lingrong spear, participate in its sparse number, so that can save the sinus. The acupuncture point is encountered, and the version deserves it, and the spear is used to save the sinus, and the sinus is not stopped; The sinus is plugged, the version is introduced, and the sinus is plugged, the sinus is chiseled, the smoke is passed, the smoke is passed, and the drum is smoked. From the left and right of the ** listening acupoint, rush ahead, don't let it go. If you collect guest points, stuff them with firewood, paint, and make no burnable version! ”

The ink master received the order, and Shi also understood: in short, it was to make ventilation clay pipes, just like gas pipes, where blowers were used to pour a large amount of smoke into the tunnel.

Then use wooden planks and other things to block the smoke on your side, and rely on the sealing of the pottery pipe to blow the smoke into the opponent's tunnel, forcing the opponent to escape.

Since the size is clearly stated, how to manufacture it is not the first time, these seemingly important issues are not important here in the Mo family.

The only thing to pay attention to is whether the appropriate geometric intersection method can accurately judge the direction of the Chu people's tunnel.