As soon as Mrs. Yang spoke, a low voice of discussion immediately came from the lobby.

Borrowing troops from the Xiongnu is tantamount to seeking skin with the tiger, even if the minister who has no knowledge knows this truth.

Zhao Chong is even more aware of the power of this, in fact, he is higher than the Tianbao Emperor Zhao Xiang in terms of talent and martial arts, how could he not know the wolf ambition of the Huns! He was obviously a little dissatisfied with the strategy proposed by Taiwei Yang, but he had a deep helplessness in his heart.

What else can you do without borrowing soldiers? Even if Xu Jingcheng supports it for a year, two years, five years, or even ten years, what can it do?

Zhao Chong thought for a moment before he said: "Don't worry, let's see how Chen Qingzhi's offensive is, if it is indeed fierce, then bother Captain Yang to send a message to the Huns to borrow troops......"

After Chen Le built the bridge over the moat, he was not in a hurry to attack the city, Xu Jingcheng was strong and tall, and he would inevitably suffer heavy losses under the strong attack, he was sitting in the camp at the moment with a brush in his hand.

The siege equipment on this continent was similar to what he knew, but there were no firearms on this continent, and Chen Le didn't want to study gunpowder, he just wanted to develop pure physical attacks to the highest level.

For example, the crossbow is a siege weapon, but what about enlarging the crossbow and replacing the crossbow with a thick trunk?

Another example is a trebuchet, if the length of the lever is extended, the force will be increased to several times the original one?

In short, the things are still those things, but after Chen Le's improvements, the power has increased greatly, but even so, Chen Le did not attack the city easily, although there are still a few vicious strategies, but after all, there are still hundreds of people in the city, and he never wants to harm the innocent.

Xu Jingcheng was surrounded in this way, and more than half a month had passed in a blink of an eye, and in the middle, Xu Jing's soldiers did not go out to call the battle, and Chen Le did not command the attack, but just changed soldiers to scold in front of the city every day.

Although Chen Le did not attack the city, he was not idle, and he was not at ease when the 500,000 army of the Western Regions Protectorate and Zhao Chengqian's army fought fiercely in the west, after all, Xiao Yuqi was in the army.

Although according to Xiao Yuqi, in his previous life, he did not commit suicide in defeat, but for the sake of prudence, Chen Le still sent Shi Jingsi with 300,000 soldiers and horses to attack Zhao Chengqian from the rear.

Shi Jingsi is a stable person, and his martial arts are already first-class, and he has to teach his own art of war, so he is very relieved to send him to Chen Le, if he can really annihilate Zhao Cheng's cadres at one time, it will be regarded as a great trouble.

Subsequently, Chen Le began to survey the geography around Xu Jing, draw a map of mountains and rivers, and began to study carefully, and after another ten days or so, Chen Le began to carry out a secret operation.

This operation is very secret, even the generals under the account do not know about it, only a few of his henchmen know, although this operation is huge, but it may not be able to hide it for long in the army, but it is always hidden day by day.

This action is not shocking to say, in fact, it is digging tunnels!

Chen Le had thought about this strategy as early as when he first saw Xu Jing back then, and now after thinking about it, he didn't come up with a better way than this strategy, and finally decided to use this strategy of killing two birds with one stone, saying that digging tunnels is killing two birds with one stone, the reason is very simple, first, as early as when Emperor Tianbao sent a secret letter to Chen Le, Chen Le sent a large number of spies to infiltrate Xu Jingcheng.

Some of these spies pretended to be businessmen and opened shops in Xujing, some pretended to be workers and worked in some places in Xujing, and some simply pretended to be rich people, named to admire Xu Jing's elegance, and set up some industries in Xu Jingcheng, enjoying themselves every day, in short, there are basically any professions in the three religions and nine streams, of course, there is also a spy center, which is divided into many branches and contacts with different spies, including Chen Le's subordinates when he was the general of Yulin, and the four people of Zhang Long and Zhao Hu Dynasty Ma Han, since then, There was some detailed information and maps that were slowly transferred to Chen Le's hands, so it was still possible for Chen Le to succeed in choosing to dig a tunnel to enter Xu Jing.

Second, digging tunnels will produce a lot of soil, and there are no telescopes in this era, Xu Jing may not be able to think of the source of these soils, and Chen Le plans to use these dirt to build a huge earth mountain opposite Xu Jing, or even a soil city! When the time comes, look at Xu Jing, advance can be attacked, retreat can be defended.

The project of digging a tunnel is not as simple as imagined, it is not to dig something and dig a hole to enter, especially the kind of tunnel that the army enters and exits, and it is not as simple as imagined.

The first thing to consider is the risk of landslides, and the second is to consider what to do if the groundwater is dug up!

Considering the collapse is to consider supporting the tunnel, which needs to have enough wood and enough labor, and the groundwater is difficult to figure out, not only to consider the depth of the tunnel, but also to consider the plan to divert the route, and in this era, there is no geological talent at all, even if there is no military outside.

The wood and labor used for support are not a problem, and the speed of the three million army is still fast, as for the groundwater, it can only be lucky, so Chen Le finally decided to dig three tunnels together.

Anyway, there are many people in the army, and there is no difference between digging three and digging one, and not only can you avoid the problem of groundwater, but also avoid digging the wrong position, after all, the distance is not short, once the direction is not right, maybe where to dig.

This project may be difficult if it is placed on someone else's body, even if it digs a few more, it may not be successful, but fortunately, Chen Le has modern knowledge of his previous life, although he is not a graduate of the Department of Architecture, but he knows a little about architecture, and when doing the planning of tunnel support, he is more than twice as strong as the people of this world.

The work progressed quickly, and the three passages were dug smoothly, not the kind of low tunnels, but tunnel-like passages that were more than three meters wide and more than two meters high, which could pass through a large number of soldiers.

With these three passages, the excavated soil can be called a huge amount, and Chen Le's soldiers transported the soil to the moat and piled it up.

At the beginning, Xu Jing didn't react, but as the soil piled up more and more, Xu Jingcheng immediately released arrows, at this distance, straight arrows and throwing arrows can still be shot, but as the soil is piled up more and more, it has become a natural barrier, and the arrows can't shoot people, not to mention, and they were given to the Qi army as armaments in vain, which suddenly made Xu Jing very angry.

Of course, Xu Jing was also wondering where so much soil came from, but looking at the Qi army transporting a lot of timber from afar, they all guessed that it was transported from Jingshan, as for what the pile of soil was for, it is not difficult to imagine that it is naturally for the siege of the city, if this mound of earth is getting higher and higher, getting bigger and bigger, reaching the point of parallel to Xu Jingcheng, it will obviously be greatly detrimental to Xu Jing's defense!