On the seventeenth day of the lunar month, the southeast and northwest outside Yanjing City, four five-zhang high platforms were built.

The wall of Yanjing City is two zhang high, and the high platform built by Yang Congyi is five zhang high, looking into Yanjing City from the high platform one mile away, the buildings and buildings in the city are clearly visible, and the mobilization and deployment of the Jin Army almost fell in the eyes of the Northern Expeditionary Army.

Yang Congyi's time limit for considering the surrender of the Yanjing Garrison and the defenders in the city has passed, and the other party has never expressed any intention of surrendering, but has submitted several letters outside the city, reprimanding the Song army for unprovoked provocations, and spontaneously invading Dajin and shattering the land of Youyan.

Seeing that Yanjing stayed behind in the mansion without any appreciation, and was stubborn, Yang Congyi no longer submitted a letter to persuade him.

Youyan has been away from the Central Plains for too long, there is no earth-shattering war, not enough to shock the world, not enough to soothe the hearts of the people, the Jin people do not surrender, and Yang Congyi is the intention, but also as the Great Song Emperor Zhao Yan's wish.

The construction of the four high platforms was quickly completed, but Yang Congyi was not in a hurry, and ordered the battalions to rest for the time being.

Two days later, a team of craftsmen of several hundred people, escorted by an army, entered the southern camp where Yang Congyi's camp was located, and was personally received by Yang Congyi.

During the meeting, Yang Congyi, the commander of the Northern Expedition, personally told them that their arrival would quickly tighten the rope hanging around the neck of Yanjing City, and they would be indispensable contributors to the capture of Yanjing City.

This group of craftsmen came from Yidu Mansion, personally selected and trained by the institute, good at making all kinds of engineering equipment, and dozens of professors from the institute came with the craftsman team, they were the secret weapon of Yang Congyi's successful Northern Expedition and capture of Yanjing City.

In the first Northern Expedition strategy, it was not necessary to capture Yanjing City with so many craftsmen, but after Zhao Yan decided to drive the expedition in person, Yang Congyi adjusted the Northern Expedition strategy, and the entire Northern Expedition battle plan became conservative, and the construction of the courtyard was particularly important.

That night, Yang Congyi took the time to discuss with the professors of the institute behind closed doors for more than an hour, and put forward specific requirements for the effect of the project.

Early the next morning, the professor of the institute took some craftsmen to visit one by one under the leadership of the generals personally arranged by Yang Congyi, and inspected the high platforms built by the eastern, southern, western, and northern battalions.

After inspecting the site, the professor and some craftsmen began to study how to achieve the effects and specific requirements that Yang Congyi, the commander of the Northern Expeditionary Army, hoped to achieve.

A day later, at the request of the professor of the institute, Yang Congyi sent 1,000 elite soldiers for their disposal, and the construction of the four high platforms began rapidly.

The requirements and effects that Yang Congyi wants to achieve are simple to say, but it is very difficult to really achieve, because he wants to connect the four high platforms one mile away from the gate of Yanjing City with the city wall within ten days, specifically, he wants to build a high wall of at least two zhang high and ten zhang wide on the flat ground within ten days, so that the battalions of troops can directly enter the city, and at the same time, the four major city gates of Yanjing City will be blocked from the outside.

This battle is a war of annihilation, and for the Northern Expeditionary Army, it is necessary to use a battle in which the Jin Army has no power to fight back at all, and it is impossible to escape, to draw an end to the Northern Expedition of the whole country, and also to clear the obstacles for sending troops outside the fortress in the future, and at the same time, it is also necessary to use this battle to cut off all the people with different thoughts in Youyan and lay a solid foundation for the stability of the Northern Expedition.

Land acquired by peaceful means is always a hidden danger, because in a decaying land, even with endless effort, it is far better to sweep everything away with a violent war, turn everything into ruins, and then build a house or a new city according to one's own will.

The recovery of Youyan is far from the end, it is just a prelude to sending troops outside the fortress, Yang Congyi has instilled a lot of ideas and consciousness in Zhao Yan for more than ten years, so after taking Yanjing City, this is a new starting point.

As a new beginning, decades, if not centuries of war, will revolve around the city, so the city must be solid.

However, hundreds of years of land annexation, coupled with the change of dynasty, the Jin people plundered excessively, the gentry took advantage of the chaos to work together, and the exploitation of the exploited has already reached the point of no return, it is for this reason that thieves in the Youyan area are everywhere, the people have fled, and the people's livelihood has withered, Yang Congyi wants to take advantage of this war to break the vested interests of the past and the present, redistribute the land, which is an indispensable resource for the survival of the people, and solve the problem of Youyan's stability for hundreds of years in one fell swoop.

At the beginning of the founding of any dynasty, there will be some old vested interests who are liquidated, and others will divide their assets and land, so that the people's livelihood will develop for hundreds of years, and the world will have stability for hundreds of years.

Regarding the Yanjing Annihilation War, Yang Congyi actually has selfish intentions, Zhao Yan and the civilian official group have more and more actions against him, and they are becoming more and more straightforward, after the success of the Northern Expedition and the capture of Yanjing, if he can't find new goals and new problems for Zhao Yan and the civilian clique to divert their attention, not only will his life be difficult, but the generals of all parties, military generals and even the civilian officials who have worked with him for many years will gradually be cracked down and liquidated.

Once Yang Congyi loses power, since the day the Xuanwei Army was formed, Su Zhong, Pan Cheng, Yao Chang, Luo Cong, Xue Wang, Liu Shi and other warriors who have been following him will bear the brunt, and the catastrophe they will suffer can be imagined, followed by Lu You, Shen Jin, Zhang Xiaoxiang, Xin Qiji and others, although they are civil officials, but they are inextricably linked with Yang Congyi, no matter what, they can't be left out, if they fall, the good situation of the Great Song Dynasty will be difficult to inherit, and it may even encounter the backlash of the northern grassland.

Yang Congyi, who has lived in this dynasty for 30 years, has already poured too much effort into this era, he dare not imagine what kind of destruction the rise of the Mongolian tribes in the northern steppe will bring to the Central Plains and Jiangnan a few decades later, if possible, he definitely does not want that to happen.

And the current facts have proved that he Yang Congyi has a chance to reverse the future.

Since there is a chance to prevent the destruction disaster that will affect the whole world decades later, Yang Congyi will naturally not let go of this possibility, although he himself can't wait, he can't personally prevent that disaster from happening, but he can use the battle of Yanjing City to create an opportunity for his successors to kill that disaster from the source.

If Wanyan Liang and Wanyan Yong are destroyed, the strength of the Jin State is weakened and the Mongolian steppe loses control, and the Great Song Dynasty is beyond the reach of the north, or the imperial court is not interested in those border wastelands at all, it will not be long before a powerful tribe will rise in the Mongolian steppe, and disaster will surely come in a few decades.

Therefore, after taking Yanjing City, when the national strength of Dongjin and Xijin was declining and it was difficult to control the Mongolian tribes in the northern grasslands, the power of the Great Song Dynasty should immediately stretch northward to fill the gaps left by the Jin people, and could not give the grassland tribes a chance to take advantage of.

The power of the Great Song Dynasty wants to extend to the north, and Yang Congyi can have no power, but he must stand firmly in the middle of the court to ensure that the people who inherit his concepts and consciousness can continue to hold the political power and military power.

In this battle, it is necessary to kill many people and kill many people, and it is basically impossible not only to let the Northern Expeditionary Army get the merits they deserve, but also to sweep away all those with vested interests, and to ensure that innocent lives are not harmed.

And one of the most difficult is the first battle, nearly 40,000 people who surrendered to the Northern Expeditionary Army, some of their relatives and family members are in Yanjing City, how to ensure that the Northern Expeditionary Army enters the city to kill their relatives, how to appease them after the death of their relatives, unite their hearts, this is an extremely difficult problem, because the two armies are fighting in the city, it is impossible not to hurt the lives of their relatives.

Since there is no guarantee for the lives of the relatives of the surrendered soldiers, the Northern Expeditionary Army cannot be the executioner of their relatives, and this kind of thing is naturally done by the Jin Army, which is the most appropriate.

So when Yang Congyi ordered all the armies to encircle Yanjing City, the secret spy line deployed by the secret spy department in Yanjing City spread the news that all the 50,000 troops under the command of Wan Yan Xizheng had surrendered to the Song army, which made the people panic and the people's resentment boiling.

Later, the people of Yanjing learned that after Yan Xizheng and others surrendered to the Song army, not only did they not lay down their arms, but turned around to join the Song army, and they were rapidly approaching with the Song army, preparing to attack Yanjing City.

This news is even more shocking and angry than Wan Yan Xizheng and other 50,000 people surrendering to the Song army, in the eyes of their Yanjing people, Wan Yan Xizheng and others are the people who protect them, even if they surrendered to the Song army before, they even dared to turn their swords and guns at Yanjing, and the anger in their hearts can be imagined.

The anger of the common people and gentry needed to be vented, so under the guidance and provocation of the secret spy department, Wan Yan Xi was waiting for the relatives who surrendered to the army in Yanjing City and were quickly abused, intimidated, and **.

At the beginning, the left-behind government also sent people to protect it, after all, those who surrendered were also their colleagues before, and their relatives and relatives had many contacts, and some of them were still very close, but the left-behind government sent ordinary soldiers, who were basically ordinary people, and the status of the official master was very different, so it didn't take long for the ordinary soldiers who couldn't get angry to turn a blind eye to the angry people, and even took advantage of the chaos to join them, and were willing to be coerced by them.

With the courtyard of the first general set on fire, riots filled the city within two days, and it was difficult to stop the humiliating killings of the relatives of the generals.

Seeing that the anger of the people was hard to quench, the left-behind mansion no longer sent troops to protect it, and only took a few people who were very close to them into their own mansions to hide, while others let the people vent their anger.

After the relatives of the generals and soldiers were swept away, the left-behind mansion immediately came out and stood on the same position of the people to make a final conclusion for this riot against the relatives of the generals and soldiers.

The Left-behind Mansion openly stated that the surrendered Song army was innocent, and their relatives were not worthy of sympathy, and said that in the future, if there were those who surrendered to the Song army, the Left-behind Mansion would behead their relatives for public display.

After making a public statement, the anger of the people subsided, and Yanjing City quickly returned to calm.

On the third day after the calm of Yanjing City, the Northern Expedition of the Three Routes basically completed the siege, and the news that the relatives of the generals and soldiers were killed had not yet spread out of the city.

In other words, so far, the hopeful generals and soldiers have not yet known that their relatives in Yanjing City have been killed by the people and the left-behind mansion.

Yang Congyi was ready to choose the right time to tell them this sad news.