In front of the moat outside the south gate of Nashouchun City, a row of cave house cars formed a row of safe house-like anti-arrow fortifications, so that more than 1,000 auxiliary soldiers could safely carry out the action of filling the moat inside.

At the same time, as the moat is filled, these cave houses can also slowly move forward, making the moat narrower and narrower.

After each siege battle, Zhu Wei would ask his craftsmen to study and improve siege equipment according to the problems found in the war, so all kinds of siege equipment were developed and perfected again and again, and more effects were made.

Although such a cave house car is now converted into an anti-arrow fortification, if it is attacked by the defenders on the city wall with rockets, it is still possible to burn down.

However, the top of the cave house car is paved with a wet mud layer, but it still has good fire resistance, and at the same time, as long as a large amount of wet mud and sand is splashed on it, it can naturally slow down the flame, and even eliminate the destructiveness of the flame.

In addition, the top is a tile-like structure, and the inside of the cave house car can also spray water and soil on the fire area to increase the fire extinguishing effect, unless it is poured with a large amount of fire oil, and then ignited and burned, ordinary rockets can not pose any threat at all.

However, the siege soldiers on Zhu Wei's side were able to use this kind of artificial fortifications directly constructed under the city wall to completely shield the threat of bows and arrows on the city wall, and put more effort into attacking the city and climbing the city.

In addition, this kind of anti-archery fortification under the city can also put a lot of psychological pressure on the defenders of the city, and many times they don't know what small actions the soldiers of the besieging side under the city wall are playing, so they will naturally have all kinds of worries and fears.

Of course, for Zhu Wei's side, this is just a small measure.

In fact, now Zhu Wei's cave house car is divided into several different types of functions, such as these can now open up the inner wall, and quickly transform into anti-arrow fortifications under the city wall, the effect is mainly to strengthen and expand the space.

In this way, the auxiliaries hiding inside can have a safer and wider working environment, so that the action of filling the moat will naturally not be constrained.

Next, they don't even need to push the cave house cart to continue to push forward, they can completely use planks and stakes to pave anti-archery fortifications under the enemy's city wall, and finally spread the anti-arrow fortifications directly to the foot of the city wall.

In addition, the wooden stakes they erected inside the fortifications can be driven directly into the moat below, thus forming a wooden fence, and the floating board laid on the moat below is fixed between the wooden fences, so that it will not be washed away by the moat water.

After training in advance, these auxiliaries have almost become professional engineering and construction soldiers, and they can quickly build stable anti-archery fortifications under the noses of the defenders, and construct a stable forward position for the follow-up soldiers to attack the city.

In fact, the craftsmen on Zhu Wei's side are already thinking about how to quickly build bridges over the moat with the help of the structure of the cave house car.

Anyway, the moat is generally more than ten steps wide, at most more than 20 steps wide, and a few bamboos can be paved on the moat to form a channel, so that you can use a more time-saving and labor-saving way to solve the moat's obstruction of the siege.

Of course, this kind of improvised bridge was originally most afraid of being attacked by fire, but if there is a fireproof roof protection of the cave house above the bridge, it is natural that it will not be worried about being destroyed by fire.

I have to say that after Zhu Wei promoted the status and identity of craftsmen, the wisdom of the working people they were able to exert was also very gratifying, in fact, it was just a change of concept.

Of course, in addition to the model of the cave house car that can be transformed into an anti-arrow fortification under the city wall, there are also some cave house vehicles that are specially used to help transport materials such as sediment and plates, and the design of these cave house cars will be weaker in defense, but the auxiliary troops that push the cave house car to move can use a more labor-saving way to quickly transport things back and forth in front of the enemy's city.

Anyway, now Zhu Wei's army has come up with this kind of method that is like moving with a house on his back, quickly filling in the moat under the city wall, and building anti-arrow fortifications, which simply stunned the Yuan Shu guards on Shouchun City.

They never thought that they could do this to attack the city, and now they have no way to use Zhu Wei's means at all, they can't see any figure under the protection of the cave house car at all, they can only look at the anti-arrow fortifications erected under the city wall, and they are approaching the city wall a little closer.

Naturally, they couldn't attack the enemies hiding in the cave cars, but even if they shot rockets at the archery fortifications covered with wet mud on top, they couldn't burn much flames.

As for throwing away the canister filled with fire oil and then using a rocket to ignite it, although it seems to be effective for a short time, it will be quickly extinguished, and there is no way to destroy the buildings below.

Outside the south gate of Shouchun City, there is a shield array laid by Zhu Wei's nearly two or three thousand troops, even if the defenders in the city want to send people out to destroy these anti-arrow fortifications, I am afraid that it will not be easy to achieve.

Moreover, the defenders in the city came out by themselves, which happened to weigh Zhu Wei's intentions.

Since you have come out by yourself, then the army on Zhu Wei's side can directly fight with Yuan Shu's army outside the city without attacking the city.

Anyway, Zhu Wei's army also has siege arrows and tower carts parked in the forward position, and they are not worried about fighting with Yuan Shu's army in front of the city wall, they will be taken advantage of by the Yuan Shu defenders on the city wall, and they will be shot by Yuan Shu's soldiers on the city wall with bows and arrows.

So at this time, if Zhang Xun, who was guarding the south gate of Shouchun, dared to send troops out of the city to meet the battle, Zhu Wei would naturally send more troops up, and all kinds of siege equipment would also be transported to suppress the threat of the defenders on the city wall to the battle situation under the city wall.

In this way, the two sides were able to start a melee outside the city, but in this way, Yuan Shu's army lost their advantage in defending the city in vain.

However, through the cooperation of the various armies on Zhu Wei's side, it is possible to take advantage of the opportunity of Yuan Shu's army to take the initiative to open the gate of the urn city and put down the drawbridge, and directly attack the urn city outside the south gate of Shouchun, and then face the south gate of Shouchun.

It can be said that Zhu Wei has designed a perfect routine for the tactics of attacking Shouchun City, no matter how the defenders respond, Zhu Wei's side can have a plan to counteract.

And once the anti-archery fortifications built by those auxiliaries in front of the Shouchun City Wall were completed, it was equivalent to building a safe hiding area for Zhu Wei's army in front of Shouchun City.

Zhu Wei can directly send troops to be stationed under the enemy's city wall, and he can threaten Shouchun City 24 hours a day, and launch a siege battle at any time, so that Yuan Shu's soldiers have to be on guard against the siege that Zhu Wei's army may launch at all times.

However, this time, Zhu Wei did not seem to plan to send troops to attack the city, but was preparing to dig the city directly on the walls of Shouchun City and attack.

Nowadays, the city is generally made of rammed earth as the basic texture of the city wall, and this Shouchun city is also constructed with rammed earth, so as long as it takes some time, it is still possible to dig a passage directly into the city on the city wall.

After all, no matter how thick the walls of a city are, it is forty or fifty steps thick, as long as the inside is made of clay as the main material, even if the soil is compacted like a rock, even if sticky things such as glutinous rice juice are added to fix it, it can also be watered and drenched to make the soil soft.

In this way, it is still easy to dig holes in the city wall with tools to dig wet soil, so that whether the city wall is dug through in the end, or the city wall is directly excavated, the towering and huge Shouchun city wall can lose the protection of the city.

Although this kind of siege battle will consume more time, this Shouchun City is not a big city that can be easily conquered, and Zhu Wei naturally doesn't care about the time consumption......