As the earth mountain became taller and taller, Xu Jing also came up with a lot of ways to stop it, but it had little effect, and in the end, Xu Jing gave up directly, wanting to see what tricks the Qi army could play.

As for digging tunnels, even if Xu Jing will consider it, he will think that it is impossible, after all, digging a tunnel from outside the city into Xu Jing, in terms of military strategy in this era, it is simply difficult to achieve, after all, it is a million army, how wide and long the tunnel to be dug needs to be? If it's narrow, it's useless at all, even if you dig it in, it's to deliver food to people, if you dig wide, how to solve the collapse, and what to do if you dig out the water? This kind of engineering is simply unheard of!

Chen Le has not been idle in the past few days, running in three places, he has to be cautious, after all, even this kind of project in the previous life cannot completely avoid the collapse, although the tunnel he dug is far less wide than the project in the previous life, but it must not be taken lightly.

Finally, a tunnel began to seep water, Chen Le hurriedly ordered someone to fill in this tunnel, otherwise the water seepage is small, and the wooden pillars supporting the tunnel structure are loosened, which is a big deal!

The remaining two tunnels, Chen Le was particularly careful, trying to bypass the shallow groundwater, and then began to dig slowly, no longer speeding up the progress of the project, and at the same time, he also began to tentatively attack the city on the ground!

I have to say that the city wall of Xu Jing is indeed too strong, Chen Le had observed it when he was in Xu Jing before, the city wall with stones and blue bricks more than two meters thick, not to mention the siege equipment, even if it is directly bombarded with artillery, it may not be able to blast it open.

He used all the equipment of the project on the city gate, and the thick trunk attacked the city gate again and again, but it had little effect, the city gate was made of solid copper plates, and even if the city gate was opened, once the jack gate inside was lowered, it would still be a problem.

As for the engineering ladder, Chen Le did not use it, Xu Jingcheng was too high, and the ordinary ladder could not be erected at all, even if it was taken out of such a high ladder, the soldiers climbed to the top of the city, and it was basically a death.

After attacking the city for a day, dozens of people were killed on the Qi army's side, and more than a dozen Xu troops were shot dead at the head of the Xu army, and a battle was over.

In the evening, Chen Le was discussing in the big tent, he looked at the generals on both sides and said: "You have also seen the situation of Xu Jing, it is an exaggeration to say that Xu Jingcheng is indestructible, but it is almost impossible to defeat Xu Jing with ordinary siege equipment, if you boil slowly, we will not be able to survive ten or eight years to Xu Jing's food exhaustion, you have also seen it, although we have secretly carried out a project, but we cannot guarantee success, what do you think, you might as well say, the more imaginative, the more marginal, the better!" ”

Things are difficult, and the solution must not be solved by common sense, which is also the meaning of Chen Le's words.

Generals, you look at me, I look at you, the more whimsical, the more you don't look for the margin, the better? Thinking about this, Cheng Tieshi immediately said: "Master Hou, I think it should be feasible if you can descend from the sky into the city!" ”

As soon as he said this, the other generals grinned, of course this is possible, but the question is how to go to heaven?

Chen Le smiled: "It's a good way, but heaven is a problem, since ancient times, how many people want to realize the dream of flying to the sky, but it is difficult to realize!" ”

The generals saw that Chen Le actually affirmed Cheng Tieshi's statement, and then began to talk about it word by word, and the ideas he said were simply varied, and there was everything.

"I think the city gate of Xu Jingcheng should be burned with fire, so that the army can drive straight in!"

"I think we should make some big firecrackers and shoot them directly at the head of the city, and the lethality will definitely be greater than that of bows and arrows!"

"I think we should bring the water of the river and flood Xu Jing."

"I think it's better to attack with fire, the Qin army burned the Baili joint camp last time, that's the joy!"

"I think ......"

Listening to these ideas, Chen Le nodded frequently, and did not deny one, these ideas are all feasible, but they are extremely difficult to operate, he thought for a while and said: "Everyone go back and think about it carefully, and then you can report to me!" ”

After a few days, the situation of the tunnel excavation is quite smooth, according to the distance to speculate, at this moment should have entered the city of Xujing, although these two tunnels are excavated relatively deep, but after all, many soldiers are operating, so in the dead of night, the ground is likely to hear the sound, and the measurement of the direction needs to be further confirmed, so the progress of the project slowed down again.

At this time, there was a war report from the west, under the attack of Li Cunxiao and Shi Jingsi, Zhao Chengqian's army had been forced to retreat, but the strange thing was that Zhao Chengqian was not defeated in the direction of Xu Jing, but went south.

The battle report also specifically described the situation of Zhao Chengqian's army, his army actually has 600,000 soldiers and horses, not to mention, there are as many as 100 generals under him, among which 18 people have the highest martial arts, according to Shi Jingsi's speculation, these 18 people should have reached the level of first-class generals, known as the 18 generals of Tiantai!

Moreover, Zhao Chengqian also has a group of strategists under him, among which Mr. Fu Long and Wo Feng are the most powerful, and this time his army can retreat with his whole body, all relying on the strategies of these two.

The corners of Chen Le's mouth twitched after putting down the battle report, this is really the son of the plane, I haven't seen what this Zhao Chengqian has been doing for more than a few years, how can he accumulate so many subordinates, and the eighteen generals on Tiantai, all of them are first-class generals, and he doesn't have so many first-class generals under him!

Chen Le shook his head secretly, a little puzzled in his heart, but he didn't worry about anything, Xiao Yuqi knew this Zhao Chengqian better than himself, and with her by Li Cunxiao's side, he was still more at ease!

The only thing he is worried about now is that the exit positions of the two tunnels are not dug correctly, and it will inevitably fall short!

At that time, the exit locations selected for these three tunnels were all among the detailed writers who infiltrated Xu Jingcheng and pretended to be large landlords, and these meticulous writers who pretended to be landlords generally had several courtyards, and the location was not in the center of Xujing City, there were enough places to dig out the exits, and they would not necessarily attract the attention of the patrol soldiers in a short time.

Although these houses purchased are large enough, after all, the distance of the tunnel is still very long, and it is not guaranteed that it will be dug to the center of the courtyard, so that it needs to be confirmed before going up to dig the exit, this confirmation is required for both sides to correspond to the code, once the confirmation code is not received, then the soldiers below will not dig directly upwards until they are forced to do so.

Chen Le's subordinates are responsible for these infiltrating Xu Jingcheng's detailed work is Shi Jingsi, and now Shi Jingsi has not returned, then Chen Le will take over personally, after all, the person who contacts these detailed works is best familiar with Xu Jing, and the way of contact is also very simple, that is, flying pigeons to pass the book, of course, the pigeon is not 100% safe, so Chen Le invented a set of code words, only these detailed works can be understood, so the contact is never a problem!