In a war, what does the defender of the attacked side need to defend?

Nature is the most valuable thing......

How beautiful life is, how splendid life is.

It is inevitable that the primary goal of reducing civilian casualties is ...... And secondly?

In the case of the current Jinling, only in the city, the area is only six or seven miles square.

With the expansion of workshops outside the city, the industrial area is dozens of times the area of the city, and the population living outside the city is also several times the population of the city......

What is the point of fighting for the city walls if the enemy army has already occupied or destroyed the industrial area?

Of course, if Bai Tu is determined to build the city wall, several large cities will all build the city wall for hundreds of miles back and forth every week, and all of them will be encircled, and it is not impossible to build it - won't the Great Wall also be built?

But that's just in a strategic sense, and it's in a tactical sense......

The heavy copper cannon of the Ministry of Industry has been tested, and is about to enter the stage of practical use, and more importantly, one of the difficulties of the "real gas machine", the large-scale problem of artificial glaze stationed in Tibet has been solved, as long as the problem of the source of real gas is solved, the use of real gas machine in large-scale projects can be carried out.

Other words......

In a few years, it is hoped that a primary press will be ordered!

Once the stamping machine is introduced, it means that it can be cast in molds on a large scale, which means that there will be a large number of gun chambers and barrels that meet the specifications......

In terms of performance, guns still need a lot of development to comprehensively surpass crossbow arrows, especially those of Chu.

If you don't consider the advantages of cost and training cost, there is basically no hope for breech guns, at least they can be compared with the appearance of breech guns, and only after the appearance of bolt guns can we talk about comprehensive surpassing.

After all, breech guns that can only be shot in line, not to mention the slow loading speed, and it is almost impossible to apply rifling technology, compared with crossbow arrows...... It only has the advantage of being cheap and easy to train.

However, if you cannon, the power can be increased quickly!

Even if the city walls of the Chengji world are insisted, they can only resist the field artillery at most, and most of the heavy artillery can't carry it, let alone the armor-piercing cannon......

Judging from the battlefield timeliness in the early stage of industrialization, as early as the 17th century, there were basically few city wall battles in Europe, mainly field battles.

The technological breakthrough of the Ministry of Industry made Bai Tu feel that the role of the city wall would become smaller and smaller in the next ten years, and it would be completely reduced to a commemorative significance in a few decades.

Bai Tu hoped that Cao Cao and Liu Bei would shout that the law of the ancestors was immutable, and that they would not fight their own new technology ideas, but ...... The princes of all parties have never stopped coveting the technology of the Chu State!

In the experimental stage and accumulation stage, various technologies can still be kept secret, but once they are actually used on a large scale, it is only a matter of time before they are imitated, and now under Liu Bei and Cao Cao, the bows and crossbows used by the soldiers have been significantly improved.

There is no development of supporting facilities, no talent reserve base, and no overall development of the industry...... Bai Tu is confident that he can always lead the way.

What if they come to steal the teacher?

The enemy just had a breech gun, and the state of Chu already had a breech gun; The enemy has a breech gun, and the state of Chu has begun to pull the bolt; The enemy had a bolt rifle, and the state of Chu ...... I can already set up a crane gun!

However, Bai Tu didn't think that when Chu took out his heavy machine gun, the enemy was still using a bow and crossbow - the Han people didn't know how to be flexible and didn't know how to learn?

The Xiongnu may have thought the same way before, until they were driven out of Hexi and Mobei by the light cavalry of the Han Dynasty......

Moreover, the speed of development after the beginning of industrialization is different from that of the era of cold weapons, and even natural development is very fast.

A hundred years after the Germans made the first "gun" that could be loaded from behind without having to use a stick to poke projectiles and gunpowder into the muzzle of the gun, the island nation was hit by two atomic bombs......

The bow in the middle of the Eastern Han Dynasty and the bow in the late Eastern Han Dynasty did not change much, but the breech gun to the atomic bomb was also a hundred years!

Even if the per capita cultural level in the late Eastern Han Dynasty cannot be made up within one or two generations, once it is separated from the content of the hard disk of the white picture, it will take more time to make up for the "foundation".

After all, a hundred years ago in breech guns, musketeers were still lining up to shoot, and melee cavalry was still a key force in the battle.

Upgrading the existing rammed earth city wall to a masonry and cement structure, coupled with the blessing of the people, can theoretically play a role.

At least...... In the face of field artillery with insufficient caliber, it can still be blocked.

However, with the rise of industrialization, the workshop concentrated the population of the original countryside, and the city wall of the mainstream county town of the Han Dynasty was more than ten miles, or even four or five miles, at most as a central castle, and most of the people and industrial areas were "outside the city......

It's like when Li Yunlong hit Ping'an County, there were also houses everywhere outside the city wall.

Is it really necessary to build walls in all major cities with a circumference of hundreds of miles?

If enough people are concentrated, the will may be able to keep up, but ......

No matter how Bai Tu calculates this account, he feels that he is losing!

This is still different from the Great Wall, although the Great Wall is long, most of the sections do not need to be too high, mainly to block the cavalry, plus to facilitate the movement of their own defenders, if you build hundreds of miles of high walls......

It is estimated that just one Jinling's investment is enough for the cement roads of Chu to pave the main roads of the country.

It is better to only build some special fortresses and fortress groups, mainly field battles and trench warfare, and there is no need to die if you are really pushed to the industrial area......

However, among the six ministries, many people have the idea of accumulating grain and building high walls, even if Bai Tu does not demolish the old city wall, some people can't wait to cash the research results of the Ministry of Industry to the city walls of the main cities first.

Of course, Bai Tu also knows this idea...... Judging from the inertia of the historical experience before today, there is actually no problem, after all, in its current form, no matter how strong the Chu State is, it cannot guarantee that it will not be attacked on the initiative.

On the contrary, the idea of abandoning the city wall, like the state and county two-tier system, is likely to attract opposition.

For example, now...... is just a Zhang Chunhua, Bai Tu has already exhausted his lips, but Zhang Chunhua is still not moved.

It's just for the sake of the responsibilities of "Shang Shulang" that he can help Bai Tu come up with ideas.

That's what White Chart likes...... No, it is the second point that recognizes Zhang Chunhua - even if he does not agree with Bai Tu's purpose, as long as Bai Tu speaks, Zhang Chunhua will help with ideas.

"Chunhua, how can you make everyone accept my idea?"

"If the king must do this, he can first try to persuade General Lu that repairing the city wall requires the joint efforts of the household department and the civil department, and the Ministry of Industry must also provide technology, but if you don't repair the city wall, you don't need to convince the six departments...... As long as the Privy Council felt that the walls were worthless, most of the six ministries would not hold on. Zhang Chunhua said after summing it up.

Bai Tu's eyes lit up when he heard this.

decided to wait until he arrived in Xinye and find an opportunity to talk about this matter with his stepfather - after all, on the road, it was not an environment for conversation, and the matter was not in a hurry.

However, after Zhang Chunhua left the luxury carriage where Bai Tu was, Lu Lingqi asked with a smile: "Hard drive, do you like Chunhua a lot?" ”

"No, it's recognition." Bai Tu corrected solemnly.