The defense of the entire fortress can be said to be armed to the teeth, and the mere height is an insurmountable obstacle, not to mention the ingenious arrangement, the defenders can be most perfectly protected, and the attackers will be subjected to malice from top to bottom.

Just when Di Qing and the others thought that this was all the fortress, the superstructure of the fortress that had been introduced might just be a granary and a warehouse for storing things, but they didn't expect that this fortress was not designed like this at all.

In terms of space utilization, it is very perfect, from the outside, over a height of 30 meters, across to the upper layer of the fortress, even if the entire upper layer of the fortress is taken, it does not mean that it is occupied.

Di Qing and the others thought that they were in the storeroom, but they were secretly killing.

The interior of the fortress is not so easy to take, the rooms are sturdy, and the interior design can be easily fortified everywhere, in which, the changeable secret passages can be quickly moved from top to bottom.

For example, on the edge of the fortress, there is a straight passage upward, although it can only accommodate two or three people to travel side by side, but it can quickly climb from the bottom to the top, and then attack it unprepared.

Similar arrangement, in the bastion, I don't know how many, unfamiliar attackers, in the face of familiar, can be completely defended defenders, then how to fight.

This is the advanced place of the fortress, the hard masonry structure, not easy to break, under the complex passages and stairs, can be easily supported to any part of the fortress.

Di Qing and others are also eye-opening, if you don't talk about the inside, purely external, an attacker, at least 15,000 people, it is possible to take this fortress, this is still under the premise that the defenders are below seven hundred, if the defenders' combat effectiveness is stronger and the number is more, the casualties will increase exponentially.

But now, with this interior design, the number of besiegers lost will be reduced, and after losing about 10,000 people, they will be able to climb the fortress.

Please note that this is an ascent, not a capture, and this is a voluntary retreat, because the bloody battle on the city walls, with the passage of the battle, especially after the siegers gradually become familiar, if a huge number of elite soldiers and veterans are used to attack, it is very likely to cause casualties to the defenders.

Even if the fortress has such and such benefits, there is a hard injury, but it can never be avoided, and that is the number of people.

This large-scale construction will become the fortress of the northern defense system of the Northern Song Dynasty, and it is destined to be stationed with few personnel, generally around 700 people, or 100 regular soldiers, 200 box troops plus the remaining border troops and militia regiments.

Once you enter the exchange, even if it is 30, 40 to 1, the fortress can not afford it.

The fort is the most, it can accommodate tens of thousands of people, but if it continues to accommodate like this, it will quickly fall into a food shortage, and at the same time, it is placed on the fort, just so many positions, it has been carefully calculated, maybe an increase of one or two hundred, will not affect the defense of the fort, and even more than 700 people on the premise that they can also replace each other, which can play a greater role.

But the most suitable is 700 soldiers, so that there will not be too many soldiers, nor too few, and they can perfectly play the role of a fortress.

After more than half of the casualties, the protective power of the fortress will be greatly reduced, before there is no internal design, hard city wall, in the beginning of about 12,000 people, the fortress can ensure that there are almost no casualties, but after 3000, there will be more than half of the casualties, or even more than 6 percent, in this case, it is only a matter of time before it is captured.

When he entered the passage above the city wall, every step of the way, only one or two people could walk, and he would be besieged by three or five people, under the premise that there was not enough bow and arrow support below, it could be said that every step was blood and tears.

In the same way, below, when the road is cut off for others to climb, the elite soldiers who attack will become alone, with one less one, different from the ordinary city wall, once you can't do anything, you can also jump off the city wall, for a very good general, you won't even get injured, but at a height of 30 meters, even if you are a special actor, don't think about going down the city wall unharmed without any equipment. As long as you come down, you will either die or be injured.

An army, the number of veterans, is always scarce, a towering, strong defensive fortress, can only catch him with fewer personnel, with the method of exchange, it is possible to capture, but when more than 10,000 are killed without damage, entering the interior is the real test.

Even Di Qing and the others, who have extremely rich combat experience, did not expect that in such a narrow, even humble interior, there is such a big killing machine hidden, it can be said that there are layers of cards, step by step is a game, sometimes, it seems that the pursuit is even killed inside, but I don't know whether it is a trap or something else.

Inside the fortress, as long as the supporters walk up to the walls and move on the walls, it is unlikely that there will be support for at least half an hour.

Isolated and unsupported, or at an absolute geographical disadvantage, in such a situation, it is almost impossible to capture the fortress, even if it is impossible to pay more casualties.

There is only simple data, but Di Qing substituted this data through rich combat experience and got a terrifying result.

It is conservatively estimated that under the condition that the defenders have sufficient food and weapons, it will cost at least 30,000 or more to capture the next fort with about 700 men, and even under the premise of paying the cost of 30,000 people, it may not be able to capture it.

This is very terrible, the art of war has clouds, ten are encircled, five are attacked, and times are divided, which tells such a truth, generally speaking, the gap between the forces is more than 10 times, and there are very few who can make a turnaround, but the bastion has changed this pattern, and the terrible bastion, even under the premise of 30 times or even 50 times, there is no difference to the bastion.

The more in-depth you understand the fortress, the more you feel the horror of the fortress, the Northern Song Dynasty is the best defense among the Three Kingdoms, and the defense of the Northern Song Dynasty can be said to be unique in the world.

However, compared with this kind of defense, there is a big problem in the defensive idea first.

In the past, the city defense was built to a large size, so that a large enough city could accommodate enough troops and arrange a strong enough defense.

But such a heavy town, once besieged, then the trouble will be great, because the bigger city, the stronger garrison, the more population, bring great pressure on the food, you can use the method of siege, reduce the loss, but for the sake of support, it is a terrible disaster, the thing that eats people, that is, the thing that breaks out in the siege, the world, all the most miserable things

Etiquette, righteousness, honesty and shame, what kind of legal principles and other things, here, can be completely discarded.

At the same time, the city that can accommodate more soldiers, the attacker, can also choose to attack at will, attack ten fingers, it is better to cut off one of its fingers, just like the battle of Xingqing Mansion in Western Xia, after the explosives blew up the city wall, the defense was opened, even if there were hundreds of thousands of soldiers and civilians in Western Xia, but the price of defeat could not be recovered.

It was the bastion who did the opposite, and he chose the smallest around.

The small circumference of the wall means that there are fewer troops that can be placed in the same place, which means that the support from one wall to another is very fast.

The siege of the city needs to bypass the range of the bow and arrow, attack from one place to another, there are many ways to go, many troops, start on many aspects, people can not support, and they will soon be able to attack the city.

But the fortress is different, not only is it faster, but it also has an internal, fast channel, which can be quickly supported.

In this way, no matter how many troops there are, there are only a few who can be placed in front of the fortress, so under the reasonable arrangement, the small number of troops in the fortress has actually become an advantage, and this is the terrible thing about the fortress.

In addition, the fortress has turned its back on the past, mixed military and civilian methods.

In the war, the so-called heaven and earth and people, mainly in the case of defending the city, under the premise of being unable to attack, the army has undergone strict training, and can still hold on, and can even reduce expenditures to ensure a long enough time.

But what about the people, unless it is some extreme premise, otherwise, in the war, there is very little food control.

The more the siege of the city, the more scarce the food, the more food is used, and people have a subconscious, for fear that there is nothing to eat, so they eat more.

Eating more can also store fat and energy, but the more you waste, on the contrary, food control is a good method, which can be consumed according to demand, so as not to starve to death, and will not produce waste.

In the same way, why defend the city, the most important thing is the people's heart, the people's heart is high, united, not easy to change, even in the siege of the city, there will be no backyard fire, at the same time, in the lack of soldiers, the people in the city can also serve as some semi-military projects, some strong, can even become temporary soldiers.

Except for those at the border gates, where birds don't poop, and where people don't even go, this is where there are only soldiers, no people, and other places, as long as they are big cities, there are them.

Without a siege, everything is very convenient, but once the siege comes, these people will consume a lot of food, even more than the army.

But the fortress is not like this, it is a militarization, the fortress, even the gate, is closed, in the environment of war, the gate of the fortress, there are a series of opening procedures, it must be ensured, there is no army in the field of vision, it can be.

As for the location of the city gate, not to mention, there is no moat, the city gate of the fortress is a huge 50,000 catties of broken dragon stone, in the current state, with the scientific and technological level of the Northern Song Dynasty, it is almost indestructible.

It seems that such a huge broken dragon stone must be very bulky, in fact, the simple stone itself is bulky, but when it is added to the fortress, it is not bulky at all.

At the same time, because of the use of pulley blocks and labor-saving facilities, the gate is blocked by a 50,000 catties of broken dragon stone, as long as there are about a dozen people, with the help of the gourd crane, you can open up this city gate within 120 breaths.

For the people who did not have any people, the people in the city, all of them were soldiers, and it was completely a fortress designed for war purposes, and there was food, and as long as there were no large-scale casualties, the morale of the army would not be lost.

If you really start a war, I'm afraid that the headache is the other party, a place that looks like a small projectile, but it has to invest huge casualties, and it is conservatively estimated that thousands of people must die before it is possible to enter the area of attack.

Even if you enter the attack area, you will not be defeated, and so on, when the attempts are unsuccessful, even the most elite troops must stop.

It can be said unceremoniously that Di Qing put himself into the attacker's thinking, and with his experience, no matter how he searched, he couldn't find a way to attack the fortress.

That is to say, if one party does not die, one side dies a lot,

This kind of pressure, on the battlefield, is a very terrible thing, and a few of them can go up knowing that they will be sent to death.

The naked example, in front of him, lost thousands of people, or even tens of thousands, did not even shake the fur of the fortress, and a few were able to continue the attack, which was definitely a fine product among the elite soldiers, even in the Liao and Song Dynasties, it was very small.

The death squad is either brainwashed, or simply committed a capital crime, and went to the battlefield to fight for a glimmer of life.

However, if the besieging people think that there are few soldiers and can use the method of siege, it is a big mistake, the siege is useful, because the more important the city, the population in the city is very large, it can be said unceremoniously, hundreds of thousands of soldiers and civilians, the consumption of food is an astronomical amount, half a year may be able to support, above this year, there is no food and grass, it will be a city problem, maybe, it is the result of a collapse.

But for these fortresses, 30 meters above, at least 10 floors, 3 floors below, up and down more than 40 meters of huge space, in the middle, how many things can be stored, 700 people, according to a person a year 6 stones, 700 people, but 4200 stones, converted, 8 600 large ships can be loaded.

600 large ships, on the canal, is considered large, compared with the fortress, it is really small, 20 meters long enough, the circumference of the fortress is 400 meters, up and down 40 meters, it can be said that as long as there is one-tenth of the space to store grain, this grain is enough for the fortress to eat for ten years.

At the same time, the fortress will also choose a place where deep wells can be drilled, at least 30 meters deep wells, so as to ensure that there will be no threat of water cut-off, as long as this problem is solved, take you around it, relatively speaking, in addition to the inconvenience of access, it is really not a problem.

Generally speaking, the entire Northern Song Dynasty and the Liao State, tens of thousands of miles of bordering places, the most important defense is the two roads of Hebei, that is, the part of the Northern Song Dynasty that is close to each other, 500 fortresses, may not be able to completely protect in place, but the border soldiers can be replaced to a large extent and used to launch an attack on the Liao State.