After knowing the purpose of Di Qing and the others coming, these group exercises were very happy, even if Di Qing and the others did not reveal what kind of person they were, but with the sign of the Privy Council, when they arrived at the place, they were called adults, no matter what level, they were higher than the group training envoys, and even higher than the group training.

In my lifetime, there is still an opportunity to teach a general and an adult, which is also a rare honor, and these veterans tell one after another, and even compete with each other.

These regimental exercises, even if they have participated in the Battle of Baozhou and have experience on the battlefield, but their knowledge is too shallow, and they can't even explain the overall situation and the overall situation, but for the fortress, when they first get in touch, they don't need to figure out the layout of all aspects inside, just a simple usage.

At that time, when the Baozhou Mutiny was imminent, knowing that this level was not easy to pass, Zhao Xin also had no reservations, and did not relax with the fortress, almost hand-in-hand, and taught these regiments the key points of using the fortress.

Among the five people left, the captain is the best among them, and he knows all the routines very well, and with the addition of the people around him, he tells the story very completely.

These generals, at the beginning, didn't care, an ordinary regimental training, can explain what clearly, can explain the basic effects completely, it is very good.

But the more I listened to it, the more terrifying I felt, especially the things that I didn't even understand when I saw these generals who had been through a hundred battles and strategized, but they were secretly killing.

Sure enough, this is a terrible fortress, a natural fortification, and it is no wonder that after Han Qi saw this fortress, almost half of the funds to the northwest were used on this fortress, and it is no wonder that even if Liao Xingzong captured Lingzhou Forte, he sighed in the face of the fortress, as long as he picked up the opportunity to go downhill, otherwise, it would be almost impossible for the Liao army to really fight and take advantage.

After listening to the narration, I used the layout of the fortress I saw, recalled the use of the fortress mentioned in the group practice, empathized, and substituted myself into the position of the attacker, which was really very scary.

Some feel that it was built so quickly, or in the middle of nowhere, and it doesn't seem that there is much remarkable, how can it be so strong in defense.

However, to verify the strength of this defense, it is not very difficult, and it is even very easy, I personally felt the strength of some fortresses, and all the generals were amazed, it was indeed a natural defense.

With a sledgehammer, it only smashed down the corners and corners, like a stone, a general who was known for his martial bravery, even the trembling arms of the hammer, could not leave a heavy mark on the wall, which was completely different from the previous city wall.

Of course, it is different, these are two concepts of things, although it is said that the strength of green bricks is lower than that of red bricks, but it is also low and limited, simple hammer to smash red bricks and green bricks, the difference is not big, but one is to use cement as a wrapping and binder, one is to use ordinary rice soup, or loess, bricks may not have any problems, the structure itself will fall apart, which is also the fundamental reason why ordinary city walls are easy to destroy.

Replaced with a cement-wrapped city wall, the inside and outside are integrated, plus this is embodied through the card system, in essence, and those fortresses built in the northwest, there is already an essential difference, the quality of steel, and even the number of cement, it seems to be a thin layer of cement, but it is difficult to be harmed, this is no longer an ordinary cement brick structure.

With such a strength of defense, a close-range sledgehammer, in the hands of a general with a strength of hundreds of catties, it is difficult to hurt this skin, it can be said unceremoniously, in the past, the practice of destroying the city wall, in front of the fortress, did not play any role at all,

Facing a smaller city wall, directly attacking the city wall, catapults, hitting wood, etc., is the best option, once the city wall is breached, the entire huge defense, there is nothing to do.

Just like in the battle of Xingqing Mansion, to be honest, Yuan Hao was also defeated inexplicably.

Under the circumstances at that time, in fact, the field battle of Western Xia was at a disadvantage, and it may not necessarily be defeated, and if it reorganizes its morale a little and retreats step by step, it can also resist the Liao State, and it will not fall into the end of destroying the country.

However, the bad thing is that Yuan Hao is not an ordinary person, he is an enterprising king, and he is also a king with outstanding military achievements, what he thinks of is to use the defense of Xingqing Mansion to weaken the power of Liao, and then defeat.

With the defense of Xingqing Mansion, Yuan Hao's approach is the least costly approach, but on the contrary, there is no way, the reason is too simple, explosives, an epoch-making thing, appeared under the city of Xingqing Mansion 500 years in advance, this Xixia production, the strength of the city defense is not too strong, became the first victim.

The breakthrough of the city wall was a huge blow to the morale of the defenders, and almost half of the Western Xia soldiers lost the courage to resist, believing that the Mandate of Heaven did not belong to the Western Xia, and the Western Xia died.

This is also the fundamental reason why in the end, the situation in Western Xia took a sharp turn.

A king who is so powerful, even promising, because he doesn't understand explosives, will eventually destroy the country, if it weren't for Yuan Hao's bad opportunity and immediately retreated, I'm afraid that even his life would be over.

It can be seen that the defense is strong and weak, and these generals, after seeing the fortress, can't help but wonder, is there a way for explosives to threaten the fortress?

If Zhao Xin was still here, he would have replied to them, no, even if the Northern Song Dynasty version of the reinforced concrete structure was used, it would be difficult.

The explosive that Zhao Xin withdrew from was based on the black powder, which was transformed, and under the perfect gunpowder formula, the final gunpowder was formed, compared to the fireworks and the previous gunpowder, I don't know how much stronger, but it could not pose a huge threat to the real reinforced concrete structure, perhaps to achieve the goal, the number needed was too much.

Similar to the fortress, which is relatively narrow by nature, and uses the frame structure of small houses one by one, even if the defense strength against earthquakes is very high, even if it is the explosives of one or two coffins, it is difficult to shake the overall structure under the premise that the seal is not too strong, and as for collapse, it is even more impossible.

Di Qing and the others don't know these truths, as traditional soldiers, the new type of explosives is just thinking about it, I heard that it has been set as top secret by the Forbidden Palace, and under normal circumstances, it will not be promoted.

This is also very normal, the Northern Song Dynasty itself is good at defense, in the vast land, I don't know how many cities, these cities are decades, or even hundreds of years, gradually accumulated cities, once the secret of explosives is leaked, it is equivalent to saying that the Central Plains region spent hundreds of years, the formation of a complete set of defense system, will be completely ineffective, the price in the middle, is unbearable for everyone.

Explosives can be used, but in key places, and at the same time, under the absolute supervision of the Imperial City Division, under the premise that he cannot be allowed to leak, this is a high requirement for the whole, and it cannot be used as a conventional means.

Aside from the problem of explosives, even the Northern Song Dynasty is so difficult to get, and it is even more difficult for the Liao State, if such a fortress is placed on the border of the Liao and Song Dynasties, then the Liao State can only attack if it wants to come over.

Di Qing didn't know why, being able to erect the fortress to a height of 30 meters, which was a great miracle for the building, but after the use of cement, this was commonplace.

Using yellow clay and rice soup as a binder, it is difficult to make a brick structure of a house more than two floors, or even two floors.

Almost all of the large buildings in the palace are made of wood, stone and brick, and there are very few of them, which is the result of the fact that cement is not used extensively.

In the war, in the strategic thinking, the siege of the city, in the absence of other choices, will choose to attack the city, in the city defense, the focus of the capture is the city wall, why it plays an obvious role, is because he is tall.

Condescending, it has an advantage, in the past, they were standing on flat ground, and the two sides were equal in an attack situation, in front of the fortress, it was not the same thing at all.

3 times the height, equal to the attacker, to attack the higher distance, it is not as simple as three times, in the siege, from the city wall up this section, the longer the time, the more dangerous.

Skilled soldiers will move forward bravely, with all their strength, in the shortest possible time, to cross this distance, any hesitation, retreat, will bring very terrible consequences, which is also the reason for the high mortality rate of recruits.

Some experienced armies tend to use experienced veteran troops in the siege, in order to reduce unnecessary losses in the middle as much as possible, hiding veterans, it seems that the loss of elite forces is small, but when this siege war is protracted, when the new recruits are dead, there are only veterans left, which is even worse.

The general city wall, even if it is a capital like Bianliang, is more than 3 zhang high, which is already very outrageous, but the fortress is different, he is 10 zhang, when the height of the city wall is increased by 3 times, it means that the distance from the city to the head of the city by the besiegers becomes 3 times, it is completely different.

The height is high, it is impossible to survive if you fall from above, from the top of the city wall, you are smashed down, or retreat, at most, you are injured, you die, it is almost very difficult, but at a height of 30 meters, as long as you fall, then there is no question of whether you will die or not, and it is the luckiest to survive, and the vast majority of people will die.

In addition to the height, there is a longbow guarding the city wall, which shows the terrible longbow and fortress at this time, and generally sieges the city, using a large number of archers, with the help of archers trebuchets and other things, suppressing the archers, so that the siege troops below can quickly climb upwards,

But the longbow is different, there is no kind of archer, can be in front of the longbow, but also able to shoot arrows, itself flat ground is 250 steps range, 30 meters above, at least 50 steps, it can be said, as long as there are archers, dare to approach, then must be in the range of the longbow, to be able to attack and attack, archers, most of them, are wearing simple armor, after all, to maintain the flexibility of the archers, then every project, to suppress the longbow above, may have to pay three times, or even five times the casualties.

In this way, combined with the height of the fortress itself, those who want to climb the tower will have to pay at least 3,000, or even 5,000 casualties.

5000 casualties, is a big number, even for a team of 50,000, one percent of the casualties, this is also a nerve-wracking, aside from those on the siege road, being shot, not to mention, as long as they are not hit, there is a great possibility, escape from the ascension, but as long as they are near the city wall, it is flesh and blood step by step, staring at the defense above, bows and arrows, step by step on the city wall, even if it is an experienced veteran, it is very difficult.

For an ordinary city wall, after climbing the city wall, basically, the most difficult part has been completed, relying on the advantage of the number of siege troops, to a certain extent, it is only a matter of time before it is taken.

But the fortress is different, this thing is too small, the circumference is four or five hundred, what is in it, there are really many kinds of things, almost every part, is taking into account the defender, there are always more people than few people.

Regardless of individual differences, regardless of the differences in various equipment, on the battlefield, an excellent commander, the greater role is to let the own soldiers always be on the superior side.

2 people fight one person, you can always have an advantage, 3 people are even more so, this is the case on the fortress, many places are cleverly arranged, so that the attacker is always under 3 times, or even 5 times the pressure, in such pressure, it is very difficult to take a step forward.

In the defense of the fortress, there is a fixed routine, if the opponent is really fierce, it will deliberately collect it and let the siegers enter the city. The following will be gradually cut off, capturing the surface, the location of the city wall, the inside of the fortress, there are also ways, on the city wall, using some holes, attacking the hanging target, it's not too good,

This is a genius idea, almost using time and space to the extreme, it is the originality of the fortress, and it is also a building like the fortress that can be used.

Why didn't there be such a unique design for the previous old-fashioned city defense, it's not that no one thought of it, it was impossible to achieve.

In the absence of a strong enough adhesive, it is important to ensure the integrity of the city wall, as long as there is damage to the city wall, it will affect the overall structure, and even become a weak structure on the entire city wall.

The fortress is different, the reinforced concrete structure, the construction of a 30-meter-high building, this is a certain margin, not to mention that the fortress is still very small, full of calculations, that is, about a few thousand square meters, the internal boundaries and strength are very in place, in this case, leaving the attack hole, will make the overall structure three-dimensional, which forms this top-to-bottom tactics.