The emergence of the fortress, and the cement is a perfect combination, that is no longer powerful, is so powerful that it is mad, height in any war, is a natural advantage, even in the era of thermal weapons with cannons and machine guns, in World War I and World War II, the high ground is also a strategic point that must be fought for, as long as there is a high ground, at least, the surrounding area, are within the scope of control. Pen ~ fun ~ pavilion www.biquge.info

The forts are such obvious heights, and they are not natural, although some of them will rely on a certain height, but most of them are man-made.

The terrible thing about the fortress is that he has brought the regional advantage to the extreme, which is actually the application of the art of war, if the two armies seem to be about the same strength, the famous generals can concentrate the superior forces through mobilization, and in most of the time, fight more and fight less, and finally gradually encroach and win.

Even seemingly equal, or even unequal, two sides of the battle, after one side has achieved regional superiority, gradually accumulates superiority and wins.

The terrible thing about the fortress is that it implements this concept in every place, not to mention the height of 30 meters, which is definitely a static loss that must be borne by the besieging side, even if it barely climbs the top of the city, it will face 3 times or even 5 times the enemy.

After it was easy to climb to the top of the city and consumed a lot of physical strength and morale, facing this, this is no longer Hardmode, it is Hell Mode, which is also the terrible thing about the defense of the fortress.

There is nothing to attack, facing the terrible defense of the fortress, you can't even change it, the engineering weapon that has the ability to get the fortress does not exist at all, and the shooter of the same level can't reach the fortress, this is not a city wall seven or eight meters high, the advantage is there, but it is not big, the three-time high fortress, the range of the bow and arrow of the same level will be more than 30 meters, this is already a grade difference.

Before the birth of artillery, it could use hundreds of people to block the attacks of tens of thousands of people, or even hundreds of thousands of people, as long as the military spirit and military rations continued, it could always be guarded by the fortifications, that was not a change, it was a earth-shaking change, so that the strength of the Northern Song Dynasty was brought into full play.

Before, it took ten days and half a month to build a strong fortress, but now, a fortress with amazing defense can be built in only half a month, or a little more time.

The most important thing is that, unlike the previous city defenses, the cost of the fortress is very low, almost the same as the previous military fortress, you read that right, that's it.

It stands to reason that the height of the fortress of 30 meters, the cost should be higher, yes, the cost of the fortress in a single plane is higher than the city, and it is much higher, but the reason why the city is expensive is because of the large.

In this, the Northern Song Dynasty, and even the entire feudal dynasty of China, have gone into the misunderstanding, the important cities in the northwest, the perimeter of the city defense, will be more than 3 kilometers, only enough area, can be stationed enough troops, in order to ensure the application of both military and civilian.

But the fortress is different, the smallest fortress is only one or two hundred meters of circumference, a larger one, may not exceed 400 meters, such a perimeter condition, the fortress is simple to the cost of each area, the fortress will be high, and much higher, but the total area, only the area of the smallest city is one-twentieth or thirtieth, even if the cost of a single skyrocketing, the total price of a fortress will not be very high.

Such a fortress, the defense is a lot, the garrison is less than the previous military village, the strong defense, even if 500 troops are stationed, it is enough to resist the attack of tens of thousands of troops, this is the real terrible thing about the fortress, when the defense is strong, when the height of the fortress is reached, the fortress itself is a powerful weapon.

Just like the Japanese bunkers during the Anti-Japanese War, in the early and middle periods, it has always been a nightmare for fighting behind enemy lines, how many anti-war soldiers, when crossing the fortress blockade line, were discovered, heroic righteousness, it seems, such a fortress battle, dispersed the troops, in the art of war, this is a taboo, once it is divided and attacked, it is easy to be broken by each one.

But there is a premise, it must be able to break through, in the northern army, which has no large artillery, and even 37 anti-aircraft guns are very few, there is no way to take the pillbox, occasionally several times to break through, but also brave machine guns and firepower, with explosives bags to rush under the pillbox, but this method, against some small pillboxes is okay, a little larger, there is no way.

The role of the fortress is also like this, his impregnable nature, more terrible than the bunker, even if it is a million troops, can be placed in front of them, that is, hundreds of people, and the fortress can be comparable to the good, coupled with the anti-arrow chain mail, the application of the longbow, almost the performance of the weapon and the performance of the fortress to the extreme, and finally a defensive weapon, became a terrible attack weapon, with the support of the rich money of the Northern Song Dynasty, with the castle chain to imprison the Western Xia and Liao.

To be able to stand in the Northern Song Dynasty at this time, whether it is the Western Xia or the Liao State, it is not simple, whether it is Yuan Hao, the founder of the Western Xia, or the monarch of the Liao State, especially Yuan Hao, almost all his life is like a hanging, how many times the situation of ten deaths and no life will be moved back by them.

The learning ability of each country is quite strong, and some excellent equipment will soon be copied, even if it is some unique equipment, it is easy to learn, at most, it is the difference in materials.

After the appearance of the Divine Arm Crossbow in Western Xia, it was learned by the Northern Song Dynasty, but unfortunately it has not been mastered by Karakuri, and later when the physical objects and drawings were obtained, it changed rapidly and became the strongest infantry weapon in the Northern Song Dynasty.

In addition to learning from each other, the intelligence penetration ability is also terrible, it seems that there is a bit of a dull war situation, such as the Liao State Xixia War in 1044, the reason why the Western Xia won, strategic success is the key, but without intelligence support, how the Western Xia secretly sent the army into place, how to grasp some of the situation of the Liao State, the strong wall and the clear field, but also to know the consumption of military food in the Liao State.

If the Liao State had a little bit of military rations left, it would only show symptoms of food shortage, with the strength of Western Xia at that time, it would definitely be an egg hitting a stone.

It can be said unceremoniously that under the plain surface, the secret war between the three kingdoms can be said to be in full swing, and it is even said that the Western Xia War of the Liao State in 1044 was itself carried out under the secret manipulation and provocation of the Imperial City Division of the Northern Song Dynasty, and in the commercial field, the Northern Song Dynasty controlled salt and iron tea, and the Western Xia and Liao controlled horses, so that all countries were quite lacking, which was not as simple as it seemed on the surface.

Between the three countries, the border is long, and in the 21st century, there are such cross-border behaviors as smuggling and drug trafficking, not to mention the era of the Song Dynasty, if there is no force playing a role in it, it is almost impossible to rely on the government decrees.

The Northern Song Dynasty is good at defending cities, but the city defense capabilities of Liao and Western Xia are not simple, as far as city defense is concerned, the Shenglong Mansion of Western Xia, some big cities of Liao, their defense is not bad. The Liao State and Western Xia were not as good at defending cities as the Northern Song Dynasty, and they were not at all unable to defend cities, and they also learned from the Song Dynasty and established a huge defense system.

Historically, Wang Shao's attack on the Western Xia finally fell short, on the one hand, the ministers of the court and the central government pulled back their legs, on the other hand, it was also because of the huge pressure of the city defense, the northwest is different from the Central Plains, there are few cities and dense villages, but some big cities in the Western Xia, for example, Xingqing Mansion, the expeditionary force of the light car and simple follower, there is no way to capture the strong city defense of the city, several times deep, but in the end they did not seize the opportunity to capture the strong city, and finally fell short.

When the Western Xia encountered the chain fort strategy of the Northern Song Dynasty, when they advanced layer by layer, they also wanted to draw a scoop than the gourd, a strong fortress, which could withstand tens of thousands of troops, if they also got one, in this way, they could also resist calmly, many of the arrangements of the fortress can be seen on the outside, and the biggest factor is not high?

It's just this high, the most difficult to solve, the fortress like this, it looks very simple, in fact, but there is a very deep technical content of things, to put it bluntly, is a modern creation, cement.

A building of more than 30 meters, in addition to cement, there is no other to ensure its height, some tall buildings in ancient times, mostly in the form of towers, the tower is relatively small, the force around is not too large, so it can be built very high, large city defense, because there are many ancillary buildings above, it is impossible to build so high.

Xixia did not expect that such a tall building was built, which itself was a big pit, but it was the layout of the fortress, there were not many problems, similar to ordinary city defense, but more attention was paid to regional advantages, not much improvement, the key is the height, 6-8 meters of the city wall, and 20 meters of 30 meters of the city wall, this difference, is not a simple multiple of the difference, representing the difference of the world, which is also the reason why the fortress is strong,

The wall is as solid as stone, so that from the periphery, the possibility of breaking through the city wall is almost reduced to the lowest level, in this case, attacking the city wall more than 30 meters, it is an absolute nightmare, for everyone, it is not a simple encouragement to be able to go up, and even an attack, to be able to go up to the city defense, is very difficult, which is also the real reason why the fortress is difficult to overcome.

Of course, the more narrow side length and area, but also let the internal support can be in place in time, the circumference is only more than 300 meters, directly from the inside, may not be 100 meters, the ancients are much stronger than modern people, at most it is more than ten seconds, will not be knocked down by the sound of the east and west.

Coupled with a shorter side length, so that in the unit area, the number of troops put into the unit is limited, even if it is tens of thousands, hundreds of thousands of troops, the ones that really come in handy, that is, the ones at the front, make the siege a filling operation, but on the top of the fortress, with the three-dimensional arrangement of the height, it is able to concentrate more troops.