Since the Tang Empire created the fortress, and after showing great tactical defense capabilities in overseas territories and border areas, the Tang Empire has maintained great enthusiasm for the fortress, and has begun to build the fortress in almost all places where it is needed.

In the prosperous inland areas, or areas with great strategic value, the Tang Empire was to build large and complete fortresses.

For example, the newly built palace in Jinling City, she is not only a palace, in addition to the magnificent buildings inside, the design of the defense system of its external palace wall is a typical fortress defense system, so the palace is actually a very typical fortress, but it looks magnificent on the outside, which makes people ignore its military defense performance.

Another example is in Jiangyin, where the army also built a riverside fort, which is also a fortress.

Then there is the Wusong Port Fortress, which is not only a naval base, but also a huge military fortress, with a large fortress in the center, and six small Lingbo around it, which is garrisoned by at least tens of thousands of troops and thousands of marines all year round.

Coupled with the hundreds of large-caliber artillery on the battery, this place has become the first fortress in the Jiangnan region, the large-caliber artillery on the battery is enough to completely block the channel into the Huangpu River, and at the same time can block the Yangtze River estuary to a certain extent, the reason why it can only partially block the Yangtze River estuary is because the Yangtze River estuary is too wide, and the current effective range of artillery, even if it is a large-caliber cannon, the effective firing range is actually not much.

Although it is said that a larger range can be obtained by raising the elevation angle, the maximum range has no meaning in actual combat, and it must be an effective range to be able to hit the enemy.

If we talk about the maximum firing range, even if it is currently the most used by the army and navy of the Tang Empire, it is also the most frequent five-kilogram cannon, and its maximum firing range can reach about 3,000 meters.

But this maximum range does not make any sense, because in the case of the maximum range, where the shells will fly, that is really only known to God.

Under standard circumstances, the effective firing range of the army's use of five-pound field guns is set at 450 meters, which is basically the limit of the effective firing range, but in actual combat, when the army uses five-pound field guns, it often closes to a distance of about 400 meters before firing.

In addition, there are also a large number of equipment, second only to the five-pound artillery nine-pound artillery, the maximum firing range of this kind of artillery can reach 3,500 meters, but the effective firing range is only about 550 meters, when used in actual combat, the army will often close to the distance within 500 meters to fire.

As for the ship-based cannons on the navy's side, although the barrels of the naval guns used are actually the same as those of the army's field guns, their actual combat effective range is closer.

In actual combat, the navy will only fire within 500 meters of naval guns, regardless of whether it is a 9-kilogram naval gun or a heavy naval gun of more than 14 kilograms, but in fact, in order to achieve a relatively considerable effective hit and damage, this distance often needs to be pulled down within 300 meters.

In the assumptions of the staff officers of the Navy's General Staff, the combat method of the Tang Imperial Navy, especially when fighting a decisive battle with the enemy fleet, should be to concentrate all the battleships and large cruisers that can be concentrated, and then form one or more battle lines, and the battleships that form the battle line form a line, and follow the advance end to end.

By maneuvering, seize the T-head, and then use the side fire to destroy the opponent, and the distance of the side fire is about 300 meters.

Although it is said that the naval guns will fire relatively close in actual battles, this is affected by the turbulence of the battleship on the sea, if the naval guns are moved to land, after having a stable design platform, the hit rate will be improved, and then the effective range will be increased.

However, referring to the army's side, its maximum effective range is actually not higher than that, and on the standard of about 500 meters, it can only be increased by one or two hundred meters at most, and it is impossible to reach the maximum range.

For this reason, the navy has thought of many ways to improve the hit rate and effective range of the naval defense artillery, not only the navy, but also the entire defense industry of the empire is working hard to increase the range of artillery.

And a lot of proposals have been proposed!

Some people want to improve the accuracy of artillery, and use more sophisticated artillery-making technology to improve the accuracy of artillery.

There are also people who want to improve the accuracy by improving the aiming method.

Some people also think that they should simply engage in the rifled cannon mentioned by the Son of Heaven!

However, it is a pity that whether it is to improve the artillery-making process, to engage in rifled guns, or to improve the aiming method, etc., these are all under the impression of basic science, and the requirements for materials and processing technology are too high, and at present, this problem is unsolvable for the time being.

At least the Royal Institute of Technology said that with the current industrial technical capabilities, the performance of artillery has almost reached the limit, and it is difficult to make large-scale improvements.

Although the military is unwilling to accept this, it can only accept it.

The effective range of the artillery is insufficient, which makes it difficult for the coastal defense artillery to block the relatively wide river!

The Wusonggang Fort was not enough to completely block the mouth of the Yangtze River, so the Tang Empire would build forts in other places in the lower reaches of the Yangtze River, except for the large-scale Jiangyin Fort.

On both sides of the Yangtze River, Songjiang, Suzhou, Yangzhou, Changzhou, and Zhenjiang have built many forts, not to mention Jinling City.

Surrounded by Jinling City, there are 12 large and small fortresses at present, five of which are river defense forts, and the other seven are city defense forts, and in Jiangpu on the other side of Jinling City, there is also a 'military camp fortress', this military camp fortress is actually just a guard army camp at the beginning, stationed on the other side of the Yangtze River in Jinling City, in order to control and defend Jinling City.

Later, according to this barracks, the fortifications were continuously built, although this large fort was simply built again, and as a result, this pure barracks in the past became a standard large-scale fortress with functions such as garrisoning troops, river defense forts, and city defense fortresses.

When the forts were built, they were often built on the north and south banks at the same time, and the artillery on both sides of the river was used to block the Yangtze River at the same time, otherwise, it was difficult to completely block the Yangtze River with only one side of the battery.

In the prosperous areas of the country, especially in the Yangtze River Basin, the Pearl River Basin, and the Yellow River Canal, a large number of fortresses and other facilities have been built, which can be regarded as just in case, and more often, these forts themselves are a huge barracks, and the result is because the military now likes to turn the barracks into fortresses.

In the border areas and overseas territories, the construction and application of fortresses are more professional.

Basically, the fortresses of overseas territories are actually not large, but the practicality is stronger, in addition to military use, it also takes into account urban functions, and the construction cost is also lower, because many fortresses in overseas territories are directly requisitioned from the local aborigines, just give a bite to eat, anyway, the Tang Empire has been building all kinds of infrastructure overseas for so many years, and there has never been a situation where the local barbarian natives have been paid, and even the food eaten by the barbarian natives is often levied on the spot. After all, the Tang Empire could not travel thousands of miles to transport grain from the country.

In the Tang Empire, there has never been a precedent for transporting grain from overseas territories to return to China, and there has never been a precedent for large-scale transportation of grain from China to overseas territories.

Because the Tang Empire ordered a ban on grain exports!

The building materials for the fort were also collected locally, and at most some cement was used to transport it domestically.

Therefore, building a fortress in an overseas territory is actually lower than building it at home, and the biggest cost may be bullet money!

However, building forts in the border areas is much more troublesome, and building these forts in the hinterland of the Central Plains, because there is no construction period limit, and there is no urgent need, and it is often the military that mobilizes the militia or the troops themselves to do it.

However, in the border areas, because of the urgent military needs, it needs to be completed quickly, and at the same time, in the border areas, it is actually difficult for the local barbarians to repair the city, for example, during the Battle of Hetao, the local Tatars naturally will not run to build castles for the Tang Empire, even if they want to use forcible means, they will run.

When materials and manpower need the support of the hinterland of the Central Plains, the cost is often relatively high.

The construction of the castle on this side of Heilongjiang was also based on the experience of the army in the Hetao area, and also referred to the navy's previous actions in overseas territories, so it made two preparations.

On the one hand, it is prepared to follow the example of overseas territories and recruit and use local barbarians to build at low or no cost.

On the other hand, as a precaution, when it is impossible to recruit a large number of barbarian natives, the early immigrants and even the army itself are used to build it.

And now it seems that when Qiu Xiao learned that all the barbarian natives in Nu'er Gancheng and the surrounding area of more than ten miles had run away, he knew that it was basically impossible to recruit the natives to repair the city.

You can only do it yourself!

After the young and strong men of more than 4,000 immigrants disembarked one after another, they began to build the city according to the militia they had formed before, and the first thing they started to build was a simple city wall.

Although guns are developing rapidly nowadays, the traditional city wall basically has no effect in front of the artillery of the Tang Army, but the perfect city defense system, especially the new defense system of the fortress, is still very good for the gun defense effect of the current era, so the city wall was built for the first time.

However, it is not Qiu Xiao's turn to worry about repairing the city and settling immigrants, and this matter is naturally responsible for Ying Junzhi of the Immigration Reclamation Division.

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