Offense and defense, these are the two eternal topics of war, and Sun Tzu's Art of War has a cloud: the impermanence of soldiers. Pen? Interesting? Pavilion wWw. ｂiquge。 info is strong to attack the danger, weak to avoid the big, why worry about defeat, invincible.

When you are strong, you must take the initiative to attack, force the opponent to fight a decisive battle, in order to prevent future troubles, and when you are weak, you can use a defensive position to gradually eliminate the difference in strength between the two sides with defense.

In this era of the Three Kingdoms, the Northern Song Dynasty was the best defense, although this is a sadness, both the Western Xia and the Liao State had a large number of cavalry, and the lack of cavalry made the famous Jingsai army of the Northern Song Dynasty disappear without a trace, and can only rely on heavy infantry and the defense of the city to resist.

It is only in the era of cold weapons, the building with the theme of blue brick rammed earth wall, the city wall is not higher than 10 meters, for the era of cold weapons, it is not an insurmountable level, but the fortress of more than 30 meters is different.

Historically, there are many strategically important Xiongcheng, for example, the Tiger Pass and Tongguan during the Three Kingdoms period, which are held in the traffic arteries, and the terrain is precipitous, which is not able to be broken by manpower, the reason is that they rely on the mountains to build, and it is on the main road between the two mountains, to establish a Xiongguan, not too high, as long as the drop is more than 20 meters, it is already difficult to break.

The natural limitations of rammed earth and blue bricks make the city walls rarely exceed 10 meters, and even if there are more than ten meters high, the arrow towers are also built near the city gates, or in a few places, the reason is to prevent the overall weight from being too high, and let the city defense collapse on its own.

After having cement, it is completely different, Zhao Xin is not a military master, let alone a defensive expert, he knows the longbow, just out of lovers, occasionally holding it, hunting in the wild, just the power of consulting, let him know that the reinforced concrete fortifications are strong, but even in the strongest period of the development of the fortress, he did not use Portland cement to build the fortress, and relied more on ancient Roman mortar.

The ancient Roman mortar is much stronger than the yellow mud paddle or yellow grass mud paddle used by the Chinese, but compared with the real modern cement Portland cement, it is not a little bit worse.

As early as thousands of years ago, ancient Rome used Roman mortar to create the world-famous Colosseum, which can accommodate 80,000 or 90,000 people, and is as beautiful as the giant football stadium of the 21st century, proving that buildings can reach 50 meters or even higher.

Ancient Roman mortar can be so powerful, Portland cement will be stronger, such a strong adhesive, combined with the strongest defense body in the era of cold weapons in the fortress, what kind of concept will it be, and in the Northern Song Dynasty, which has not yet felt the strength of cement, it is destined to create brilliance.

Things have been made, Zhao Xin praised the two potters, and gave them a reward of 500 Wen on the spot, so that these two were flattered, I thought that the professional requirements here would make them lose such two high-paying jobs, 10 times the salary, but I didn't expect that it was just the simplest thing.

I have been an apprentice for 10 years, watching the fire is the simplest, as for the ingredients, there are detailed proportions, lime, clay and some mineral powder, these are much simpler than pottery, at least do not need to be made into a rough embryo, as long as it is ground, mixed together, and added to the lime kiln for calcination, so simple, who wouldn't.

The salary of 15 guan was kept, and the more than 500 wen was also obtained, and even since yesterday, they knew that the steamed buns that swept the whole Baozhou were the products of this Miaojiazhuang, and they had also tasted these things in Baozhou, with their meager salary for a month, they couldn't buy a few at all, at most they bought a few for their families to try.

Now, knowing that not only can they eat openly, it is one of the food supplies, there are other better ones, and even can be bought cheaper, and the little left over every day will be sold to the villagers of Miaojiazhuang at cost price.

This is a good thing, 15 times a month, it's no problem to buy these, let alone cheap.

In short, in the eyes of the two potters, this is a great thing, not only the work is simple, there is no difficulty for them, the salary is also high, they are in a good mood, hard work, for Zhao Xin, how not.

Before, when there were no professionals, whether it was a longbow or soda ash, he could only do it alone, although the secrecy was high, but how much he could do alone, the whole chemistry was complicated, and there was a future, if he could go to a high position, or even grasp the power of the dynasty, how could there be this time.

The way of the emperor is the best, decentralize some, and even don't tell them the principle, let them make their own, you can greatly liberate him, of course, the necessary countermeasures are still needed.

Zhao Xinke knows that cement plays a huge role in the military, if this thing leaks out, the Great Song Dynasty may not have no means of countermeasures, he has a lot of means to attack cement, but those means are all means of thermal weapons, obviously it can easily solve the problem, why make the city nightmare.

Now, only these two craftsmen, and even these two craftsmen, have not realized what this thing is, and it is enough to strengthen the control.

This strengthened control does not mean coercion, where there is oppression, there is resistance, this is the truth, but inducement is always the best way.

gave the craftsmen a good treatment, and even let them bring their families over and pay a little money, it's okay, besides, the industry and information system of this era, signing some confidentiality agreements, the possibility of their rebellion will be greatly reduced.

Besides, now, cement has not played a role, even if he does the next experiment, a small number of people know, as long as it does not play a role in the military, he is not afraid of being targeted, and there is still a lot of time.

found Miao Yuan and told him to do this well, for this, of course, Miao Yuan patted his chest and agreed, in fact, when he found these two potters, he was ready to sign a confidentiality agreement, but he didn't know what Zhao Xin was doing, if he still burned pottery, there was no way, it was someone else's craft.

Obviously, Zhao Xin took out something of the same grade as the previous foaming agent, and his intuition told Miao Yuan that this is probably also a money-making business, such a business, of course, to protect the secret recipe in his hands, he knows that Zhao Xin turned decay into a magical effect, once the secret recipe of the foaming agent is leaked, how can they make money.

A Baozhou periphery, a day can create a net profit of almost 2,000 runs, if the entire Baozhou, the border military state, plus Hebei Province and even the entire north, how much profit will there be, the profit is so big that even Miao Yuan dare not think.

This powder may not be as powerful as a foaming agent, but it is also a thing worth a lot of money, and he did it on the spot.

If Miao Yuan knows, even if he overestimates the role of this cement as much as possible, he still underestimates cement, cement is more widely used than soda ash, and even in the era of cold weapons, it has an incomparable military role, and it is not an exaggeration to be called the country's heavy weapon.

Let the servant bag the cement, bring it back to the mansion, and with a simple command, find a bricklayer to find it.

Because of the relationship between the construction of military houses and some houses, Miaojiazhuang recruited a lot of masons in Shili and Eight Townships, which were all before the application for group training, and also verified by the household registration, not afraid of being lurked, the cement effect is huge, he doesn't want to be exposed to some giant crocodiles when he is still weak, and even in the eyes of the intelligence organizations of Liao and Western Xia.

A total of 7 people came, and even 3 were masons from Miaojiazhuang itself, Zhao Xin's identity was the fourth young master of the Miao family, and he was also the most honorable person in the entire Miaojiazhuang.

Zhao Xin's instructions are very simple, let them do the old business, they mix the cement, add a certain amount of sand, the river next to it, is the bottom of the sand, the sand because there is no cement, it is not a building material, these fine sand just stay here, long-term waste, accumulation of savings, once it reaches a certain extent, it will rot into soil.

But now, with cement, the mixture of cement and mortar is the best binder, just add the right amount of lime.

The use of cement is a very broad topic, about reinforced concrete, about cement mortar, there are different proportions, Zhao Xin also happened to know, because in high school, in the village, a capable person who went out to work returned to his hometown to build a house, at that time it was a major event in the countryside, the villagers, almost every family had a manpower, even if it was Zhao Xin, it happened to be a holiday, as a 17-year-old strong laborer, he also went out to help.

It was this help that his task was to mix mortar, which is also one of the few easiest manual jobs, the cement mortar used to build the wall, basically 1:1:6, that is, one kilogram of cement, one kilogram of lime and six kilograms of sand mixed, now the content of cement is not high, containing a part of the soil and lime, the proportion of cement is a little higher, the proportion of lime is less, and then the appropriate amount of sand, mix them with water.

Zhao Xin gave a clear proportion, said in detail, the bricklayer didn't know what it was for, but still did it, mixed the mortar, some like yellow mud paddles, but the color was different, when Zhao Xin said the use, they knew that this was originally a new adhesive, used to build walls.

It's not that difficult, the cement mortar to build the wall, the same as the use of the yellow mud paddle, is to put the bricks there, add mortar, and then glue them together, which is something they are familiar with.

This time, Zhao Xin didn't ask them to build a building or build a wall, but just made a simple, boxy stone pier.

About 100 bricks, mixed with cement to form a boxy stone pier, for skilled masons, do not do too fast, such a small job, not at all 7 people, even any of them, can be completed quickly.