The first to come to the location of the Iron Lock Hengjiang was Guan Suo's troops, and his troops were originally stationed in Chibi, very close to the place where the Iron Lock Hengjiang was located.

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The fastest updated novel, Iron Lock Hengjiang, was built between Chibi and Xiakou, and Chibi was only a few dozen miles away.

The first task of the rope was to break the chain tied to the south bank.

And if you want to break this thick iron chain, you must first destroy the Soochow army stationed here.

The people of Dongwu also know that although this iron chain is very thick, although it is buried deep in the ground with iron piles, there is still a way to destroy it, after all, the skilled craftsmen of this era are not vegetarians.

At the very least, their blacksmiths in Soochow had the means to destroy it themselves, but it was only for a long time.

The best way to prevent the chain from being broken by the enemy is to prevent the enemy from accessing it.

Therefore, Soochow stationed 5,000 soldiers and horses at each end of the chain.

Five thousand soldiers and horses were not many, and they were not enough to resist the attack of the Han army.

But the 5,000 men and horses were stationed in a military fort, and the military fort was built on the riverside, and the fixed point of the huge iron chain was protected in the military fort, so the iron chain was extended from the military fort, and after coming out, it immediately arrived in the river.

In other words, if you want to use the chain on land, you must first break through this military fort.

Although this military fort is small, it is very strong, at least in this era, in addition to the city built by Shu Han with cement, the two military forts that protect both ends of the iron chain are strong.

These two military forts are different from the previous city walls built with rammed earth and bricks, but are built with stone barriers below one zhang, and traditional city wall bricks are used for more than one zhang.

This is obviously designed for Shu Han's fire ~ medicine.

Soochow did not obtain the cement technology of Shu Han, but the construction effect similar to cement can still be achieved with strip stones, but with the productivity of this era, it is conceivable how much it cost to build these two military forts in Soochow.

Fortunately, these two military forts occupy a small area, otherwise it would not have been possible to build them in a short period of time.

In addition to strengthening the defense of the military fort with strip stones, the Soochow people also invested a lot of money to strengthen the firepower of the military fort.

That's right, it's firepower, Xu Jing sold the firearms of Shu Han to Wei and Wu secretly, Wei made a lot of cannons with the strength of the country, and Eastern Wu was not far behind, and also exhausted the treasury to make some firearms.

Now there are eight guns ~ cannons erected on each military fort on both sides, two on each wall.

One city wall has two fires ~ cannons, in fact, the lethality is not very much, and the threat to the besieging side is not great.

Helplessly, with the current national strength of Eastern Wu, it is impossible to build too many fire~ artillery, plus there are important places such as Jianye to defend, so there are only eight military forts assigned to each military fort.

However, there are still high-IQ talents among the people of Dongwu, and they have thought of a way to make these eight fire~cannons play the role of thirty-two fire~cannons!

Since this military fort is very small, the gun~ cannon can be turned around to hit the opposite or the outside of the wall next to it from this wall, as long as it is a movable gun mount.

Of course, it is better to build the turret a little higher, the higher the better, and if it is high enough, it can even face the situation outside the city walls.

It was not difficult to build a tall turret, so the Soochow built eight turrets on the four sides of the city wall that were two feet higher than the city wall, and also installed a turntable turret on the turret.

The people of Dongwu also recruited a lot of skilled craftsmen, and they didn't know where to get the "Ministry of Industry" of Shuhan

They installed the bearings under this large turntable, so that this gun mount could rotate at will at 360 degrees.

In this way, when the enemy outside one wall is attacking too hard, the six cannons on the other three walls can turn their heads and assist in attacking the enemy outside that wall.

Of course, since the range of these six cannons was to cross the fort, they could not have attacked the enemy too far, and they were only useful if the enemy was closing in on that wall.

This has to be said to be a great invention of the Dongwu people, and even Liu Hou was very impressed when he received this information from the spies, and the brains of people in this era are very good, and they can think of such a way to make the limited resources play a role several times.

Originally, each city wall can only use two fire ~ cannons, now you can use eight at once, if in other larger cities, to install eight fire ~ cannons on each city wall, the four city walls to install thirty-two, the Dongwu people do this, enough to save twenty-four fire ~ cannons, how many resources should be saved.

Although the range of the other six is a little closer, and the aiming is a little more troublesome, it is still very good, and at least it can solve a large part of the problem.

And what amazed Liu Hou the most was that the people of Soochow created a set of methods in order to solve the aiming problem.

The Soochow people divided the land within a certain range outside each city wall into squares, and the size of the squares was about the same as the explosion range of fire~artillery shells.

Each cell is numbered with two numbers, vertical and horizontal.

For example, the grid in the third column of the sixth row is numbered as three vertical and horizontal six, or simply three six.

The soldiers on the wall on this side observed that the enemy had reached the grid, and they held up two signs, each with the vertical and horizontal numbers of the grid.

The artillery signs on the other three city walls know the coordinates that need to be hit.

They have a table with the shooting parameters of each grid, as long as you check the table, you can quickly determine the shooting elements, and then load the ammunition as quickly as possible, adjust the muzzle to fire ~ out.

Of course, they must have tried firing repeatedly, determined the firing parameters of each grid, and prepared the table for later use.

Liu Hou felt that this method was incredible, these ancient people even figured out the coordinates, could it be that there was also a traverser on the other side?

In fact, it is also Liu Hou's rare and strange, gentleman's six arts, qin, chess, calligraphy and painting, in which chess refers to Go, isn't the chessboard of Go such a grid, isn't it a coordinate system?

There are many Confucian generals in the Eastern Wu army, not to mention Zhou Yu, Lu Xun is also a person who reads poetry and books, and he also plays Go well.

This ingenious method was occasionally come up with when he was inspired by the chessboard when he was playing Go with others.

After experiments, it was found that this method is indeed feasible, which can not only solve the problem of difficult aiming on other city walls, but also solve a series of troublesome problems such as distance measurement.

The artillery of the Shu army will measure the range, which involves a series of mathematical knowledge beyond this era, such as geometric trigonometric functions, which is the secret of the Shu army, which is said to have been taught by the divine calculation Zuo Ci, and it is impossible for the people of Eastern Wu to obtain such knowledge.

In fact, the knowledge of geometry is in the "Dahan Longteng Academy"

The senior class has to learn, but the academy does not teach students how to apply this knowledge to do ranging, and the ranging must be used with special tools.

However, after entering the military research institute, there is a study in this area, especially for students who choose to study artillery, and this content is even more important.

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