Liao is a unified country, even if there is a huge gap with the Northern Song Dynasty in all aspects, but they have a complete system and a certain degree of judgment, and they will not know that they will not succeed, and they are still brainless, which makes no sense.

Under the premise that the rush has no effect, especially if the rush has reached under the fortress and started to attack, there is nothing wrong with the fortress, but the structure of the rush car cannot withstand such a terrible force and is finally destroyed.

This shows that such a fortress is not what they imagined, so unbearable, although I don't know what method the Northern Song Dynasty used to set up such a strong, defensive building here, but almost everyone knows that a forcible attack has no meaning.

In particular, the arrival of the Song army's backup, with at least 50,000 people lined up in the rear, also made them understand that the numerical advantage was not enough.

It was not that the Northern Song Dynasty had no way to mobilize huge forces, but this special fortification, they were only able to accommodate so many.

Only able and only, these are completely two concepts of things, and there are only so many of them, they can completely defeat their opponents with endless attacks and fatigue.

The appearance of reinforcements makes this the simplest and most brainless method, direct bankruptcy, you finally took two or three days, so that the other party is tired, and there is an opportunity to take advantage of, but the follow-up reinforcements rush up and beat you all the way, no need to defeat you, just let you retreat, and then they can easily change personnel, everything before has become useless.

It looks small, with only 4 fortifications, but like iron balls, it can't be burned or broken, and it doesn't look like it's easy to start.

In this way, the Liao State stopped the attack, but did not retreat, they were looking for other possibilities, the biggest is to move troops from the vicinity of Yunzhou, and prepare to enter Youyun from the flank.

If Liao Xingzong really has a heavenly eye, he will definitely veto this method, and it seems that the plan that may succeed is actually not feasible.

The cavalry of the Liao State, especially the heavy cavalry, their strength is to win in field battles, and this kind of siege warfare is not what they are good at, let alone such a perverted defense.

From the point of view of Liaoguo, such a strong fortification, and built so quickly, must be extremely expensive, this Shanhaiguan is too important, and the key place will be built, and there are four at one time, other places, there should not be much, but also Liaoguo, under the premise that the main force of the Northern Song Dynasty is here, detour into Youzhou, will definitely be able to produce results.

For the cavalry, a large-scale detour is not achieved overnight, even in an army like the Tielin Army, to be able to do this, it is also necessary to choose, after all, to be quiet, but also in the time of the opposite end, detour, in the army of about 200,000, only sixty or seventy thousand were selected, these are enough for Liao Xingzong.

In his opinion, the 70,000 or 80,000 elite cavalry of the Liao State, facing the elite of the Northern Song Dynasty of 150,000 or even 200,000, would not be much weaker even if they could not win.

Even if Liao Xingzong is in such a losing stall, he still looks at the problem with old eyes, the Liao State is not weak, but the Northern Song Dynasty is stronger.

Just like now, these armies on both sides of Shanhaiguan, even if they are the cavalry of the Liao State and the forbidden army of the Northern Song Dynasty, may not be able to take it under the premise of one to one, let alone sixty or seventy thousand, the most important thing is that Youzhou at this moment is a little different from before.

The sea ships of the Ding Navy did not participate in the Northern Expedition, but if you really want to evaluate, the sea transportation of the Ding Navy is very involved.

Whether it is from the very beginning, transporting troops to the Liaodong Peninsula, to Shanhaiguan, and then to transporting materials, these cannot be done without sea ships, and dozens of kilometers, or even hundreds of kilometers of sea water, will become a natural curse and cannot be passed.

At that time, even if it is the Northern Expedition, it will be a conventional operation, maybe at the beginning, by surprise, take Sanguan and Zhuozhou, and then Zhejin Mansion, I am afraid it will be a battle and a tug-of-war.

Not to mention, Ding Haijun's deep-seated changes in the Northern Song Dynasty, longbows, fine iron, fortresses and explosives, almost unceremoniously said, without any of these, at least heavy losses, at worst can not achieve the goal, this is the role of Ding Navy's subtle influence.

After Han Qi decided to develop Youzhou and establish a stable defense, the Third Division placed an order, which was then directly transmitted to the Ding Navy.

At this time, although Zhao Xin was still in the Ryukyus, before leaving, he had already issued an order to put all orders on the Northern Expedition on the first sequence, even if it was unreasonable, he would fully support it.

Up to now, the scale and volume of the entire Ding Navy have reached a terrifying level, even if it supports the Northern Expedition of 500,000 people, it is nothing more than tens of millions, these are nothing more than tens of millions of dollars, these are nothing to the Ding Navy.

Once an industrialized society has established the most basic foundation for industrialization, and then develops, it is fast and terrible.

After the completion of the canal dug, the shipbuilding of the entire Ding Navy began to climb the peak, and at the beginning, the military, the Industrial Bureau, and transportation were still fighting for who the ship was used for, and the attributes and functions of the ship.

But now, a few months later, with the expansion and output of shipyards one by one, ships began to appear in a steady stream, and the production efficiency and scale brought by industrialization were unimaginable in the Northern Song Dynasty society.

For example, at the beginning, when Xue Yudai led a large transport ship to send the seeds to the Liaodong Peninsula, that was most of the capacity that the shipyard could take out, but more than 40 days later, between the Liao and Song dynasties, in the Shanhaiguan confrontation, basically, under the premise that the task of the Northern Expedition had been completed, the number of ships was 100.

When 100 large ships of 100,000 materials were opened, the power generated was several times higher, and Tanggu Wharf was also very busy at this time.

Ding Haijun initially hardened the wharf, and on the basis of the natural wharf, ensured the construction of some facilities, and then there was manpower and material resources, under the premise of taking down Youyun and capturing a large number of young and strong, there was no shortage of people.

Countless steel, cement, and other necessary materials have been continuously transported to Tanggu, and in the past, in the expedition, the biggest problem, the problem of material transportation, is completely non-existent here.

In the past, because of the lack of horses in the Northern Song Dynasty, even if materials were transported to the northwest, there were few carriages, and most of them relied on manpower to transport 1 stone of grain to the front line, and 20 stone of grain might be consumed in the middle.

But with the use of sea ships, it is different, the sea ships of all materials, at least equivalent to 5,000 carriages, manpower is even more incomparable, but how many manpower is consumed, if you do not consider the premise of fighting, simple sailors, that is, seventy or eighty people, not to mention, there are advantages such as speed.

In the downwind, the speed of 12 knots is almost not much slower than that of a fast horse, and the most important thing is that it saves manpower.

Speed, efficiency, total tonnage, these have become the guarantee of the Northern Song Dynasty, itself, in terms of equipment and various things, the Northern Song Dynasty is also stronger than the Liao State, under the premise of perfect security, the Northern Song Dynasty itself can be with the Liao State hard steel, not to mention there are various means.

Under the premise that the war had already begun for a long time, and the Liao State did not even know who would attack them, the final victory or defeat was certain.

A large number of materials were transported to Tanggu, and through a large number of vehicles, transported to various places, the transportation task is very heavy, Han Qi is ready to take Zhejin Mansion as the center, build an X-shaped defense system, with Zhejin Mansion as the center, in four places outside Zhejin Mansion, about 20 miles away from Zhejin Mansion, 4 fortresses are arranged, and then separated by 50 kilometers, a total of 16 are arranged, which is equal to 4 in one direction, stretching for 150 miles.

This distance is not long, 75 kilometers, that is, the original distance from the center of Beijing to the suburbs of Langfang, but this encompasses the most essential part of the entire Youyun.

The most developed city and the largest population are concentrated here, which can be said to be the core of the core, and 16 bastions can be guarded by such a core.

Of course, Han Qi can't have such extravagant hopes, if he wants to defend the entire Youyun and simply build a fortress, it may take 300, or even more, but these 16 are the core.

The war has come, Di Qing and Liao Xingzong are facing each other at Shanhaiguan, you can guarantee that the Liao State will not bypass the entire northern mountain range, and the Manchu Qing Dynasty will be able to detour to Shanxi to enter the customs, not to mention, Yunzhou and Datong, still in the hands of the Liao State now, Youyun has no defense here, rather than fighting with them in the field, it is better to rely on the fortress, which can be attacked and defended.

16 fortresses, compared with the initial more than 100, or even 200 fortresses, I don't know how much, and the construction of large-scale brick factories in various places, but also solved a lot of problems, the skeleton of the fortress, its foundation, a building more than 20 meters high, may weigh a thousand guilders, or even more, in the abandonment of cement, sand, water, steel and cement, these are much less, in the frenzied mobilization of manpower and animal power for transportation, now it is basically in place.

16 fortresses, in the whole of North China, have risen from the ground, the fastest ones, have been built to more than 3 floors, even the slowest, will be completed in 10 days.

Han Qi is the first to contact the military high-level of the fortress, and it is also the high-level who has the most confidence in the fortress, the fortress is in the northwest, and has completely shown its role, if there is no fortress, when he fought in Xingqing Mansion, he would definitely not get such a big result, and get out.

Now, in the north, against the Liao State, the fortress also works, Shanhaiguan has been shown, and now, once these fortresses around Zhijin Mansion are built, the security here is absolutely guaranteed, even if it loses the control of several states, or states and counties, it will not let the results of the Northern Expedition fall.

At present, on Youyun's side, all kinds of things are proceeding steadily, and under the two-pronged policy of iron fist and Huairou, the entire prefecture and county around Zhejin Mansion have also begun to stabilize, but Han Qi knows that this is just the appearance.

Han Qi, who has experience in governing in the northwest, is still relatively in place for the management of foreign races, and the occupation army sometimes suppresses it on the surface, but in fact, there will be many problems, and the northwest has spent seventy or eighty years, and there is no way to solve them, and even finally turned against a Yuan Hao, in Youzhou, the problem may be even more serious.

He really hasn't thought about how to deal with it, immigration is certain, but the contradictions brought about by immigration will also be highlighted, which requires more flexible political wisdom.

At this juncture, the Ding Navy once again brought a large number of supplies, including a large number of logistics materials, more than 300,000 donations, even Han Qi was a little moved, and personally met with the person in charge of the Ding Navy.

However, this meeting presented him with a problem, the person in charge proposed a cooperation, the core of cooperation is not wealth, but people.

According to the person in charge, Ding Haijun will give a unified price to all the people in Youzhou, no matter what nationality it is, according to a group of 6 people, namely two prime of life, two old people and two children, such a group, Ding Haijun will give a fee of 150 yuan, as long as it is sent to Tanggu Wharf, and the rest is in charge of Ding Haijun, and everything is in charge of food and accommodation.

Han Qi has been an official for so many years, and he has heard about buying people, but those buyers are all young and middle-aged, and even women in the prime of life are very disgusted, not to mention the elderly and children.

Youyun area, as the Han nationality, is the area under the jurisdiction of the Khitan, the population is relatively dense, taking the current Northern Song Dynasty occupation of 12 states in Zhejin Mansion as an example, there is currently a total population of about 1.2 million, plus the young and strong who were captured before, if you make up, you can almost make up 100,000 groups, which is 15 million guan.

This is a huge amount of money, which is not only enough to support Han Qi to show his skills in Youyun, but also a stable situation for Youzhou.

The instability of Youzhou lies in the population, as a civil official, under feudal ethics and morality, it is impossible to massacre like nomads, this 1.2 million people, like a time bomb of 1.2 million, how to deal with it, whether it is evacuation, or something else, without decades of careful handling, this is absolutely impossible.

However, once they are sent out, not only can they get a lot of money, but Han Qi does not plan to use this fund for himself, he can completely immigrate from these densely populated places such as Hebei and Hedong, as long as the immigrants are more than one million, just like in the northwest, the thousands of miles of fertile land here will become another northwest.

The northwest is the foundation of Han Qi's life, without the northwest, there is no position of Han Qi at this moment, but the clouds are more important, not only after taking it, it is the barrier of the entire Northern Song Dynasty, but also the land is fertile, fertile soil for thousands of miles, once developed, this is a more dazzling foundation, in Han Qi's view, take here, stabilize, the foundation of his future summit is stable.