Outside the woods where the tunnels were dug, there were stubborn barbarians patrolling back and forth from time to time, and the number of them was much higher than in the previous days. On the one hand, it is to avoid the situation of being peeped into the woods by the defenders of Exian County again, and on the other hand, it is to prevent the Jingzhou army in the Han army camp from coming to inquire about the situation in the woods, after all, this forest can be detected by the Jiangxia thieves of the Han army's enemy, and the Han army allies in the camp can not find out more ways, so in order to protect their intentions from being known, Fuquan can only increase the number and intensity of inspections.

Since Fu Quan planned to take the county town of Exian alone, and did not give Zhao Kai a chance to share the merits, he naturally couldn't know his plans in the Han army camp. These Ban Yu barbarians who were not dug tunnels underground, but came out to inspect them, greatly strengthened the security in the woods, and for a while, it also made it difficult for the Jingzhou army, who had been ordered to come to investigate what Fuquan wanted, to detect the enemy's situation.

Of course, always staying in the woods and not letting the Jingzhou army do what it is doing will always make people suspicious, and Fu Quan only said to the outside world that the army is building siege equipment and needs the trees in the woods as raw materials.

In this regard, the Jingzhou army under Zhao Kai naturally didn't believe it, after all, if you build siege equipment, it won't be built by thousands of people for a few days, right? And the Jingzhou army also has capable people, although they can't find out what the troops under Fuquan are doing, but they also investigated that the siege equipment built by the Yizhou army in the woods has not been built much in the past three days, and the soldiers of the Yizhou army are like they haven't slept for many days, and they don't have any spirit at all.

However, whether the Jingzhou soldiers believe it or not, it is an indisputable fact that Fuquan's soldiers and horses are in the woods, and even he himself is in the woods, and only Xu Huang is left in the Han army camp with hundreds of soldiers and horses. Even if Zhao Kai wanted to go to the door to find Fuquan in person, he couldn't find his figure, let alone the military meeting held by the Jingzhou army, Fuquan didn't go at all, which disappointed Zhao Kai and others who wanted to force Fuquan to submit.

After that, Zhao Kai and the others only thought that Fuquan was angry, and did not work with them, nor did they think deeply, let alone find that Fuquan was digging tunnels. After all, if you really want to find the tunnels dug by Fuquan, unless some of them enter the woods and see the tunnels**, they can only find clues from the dirt piled up everywhere or the number of wooden stakes used to fix the caves, as well as the water vapor around the woods.

Needless to say, the first two are all in Fuquan's calculations, and he has long chosen a reasonable way to cover them up. There is also a reason for observing water vapor, because once the tunnel is dug and the underground is hollowed out, due to the change of the inside of the soil layer, every morning, a large amount of water vapor will be produced above the tunnel, which will slowly appear on the ground through the soil layer. For experienced diggers, it is easy to find and judge, but it is obvious that in the entire Jingzhou army, Wen Shang may be the only one who understands this way, but he himself obviously will not say it.

Therefore, even if Zhao Kai and the others wanted to break their heads, they would not be able to figure out what Fuquan was doing hiding in the woods all day, and they couldn't guess.

In front of him, another team of shirtless, carrying cloth bags full of mud walked in front of him, Fu Quan looked at the tunnel hole with a look in his eyes, and finally he decided to take the suggestion made by Wen Shang, who had just learned about the development of the war today, and no longer chose to dig tunnels directly, and sent people to sneak into the city secretly to absorb the suggestions of the county seat of Exian County, but instead used another tunnel siege method proposed by Wen Shang, that is, the method of breaking the pillar and breaking the city.

After the rebels of Exian County used the listening urn to investigate the situation of the Han army digging tunnels and was discovered by the Han army, Fuquan had been thinking about whether to continue to implement the plan, after all, digging tunnels and sneaking attacks, the relationship lies in the secrecy of the plan, and now that the news has leaked, the probability of success is obviously very low, but it is better to cancel the plan. Who knew that when Wen Shang came to check the progress of the tunnel alone, after knowing about it, he thought that Fu Quan proposed this broken pillar breaking city method.

There is actually a reason why Fuquan finally chose to use this siege method, after all, his soldiers are very precious, and it can be said that one less dies. And because he is a guest army, he can't recruit supplementary soldiers in time, so after being discovered by the rebels, he sends his elite to sneak into the city to sneak attack and seize the city, Fuquan instinctively hates it, and he has never liked to do low-loss transactions. Just like now, if this method is used, it is impossible to say that his soldiers who lurk into the city will be surrounded by rebels and die tragically in the city, this kind of loss will be too great, so Fu Quan will choose this siege method,

The so-called method of breaking the city with broken pillars is to dig tunnels, and after digging the foundation of the opponent's city wall, it will not advance. Instead, the foundations of the opposing walls are hollowed out one by one, until a certain foundation is hollowed out, and then the hollowed-out foundations are filled with grease-soaked wood. So that the walls do not collapse immediately. After that, we will continue to dig and fill in again, and when a large section of the foundation has been concocted in this way, it will be confirmed that the empty foundation can be the collapse of the wall, and then the wood can be set on fire.

In this way, as a large section of the city wall collapsed in an instant, the fortified city that was attacked was no longer breached, after all, the city had no walls, and soon it was left to the local attack? Historically, Yuan Shao and Gongsun Zan competed for hegemony in the north, and Yuan Shao's method of breaking through Yijinglou was to break the pillar and break the city.

Of course, it does not mean that every city is suitable for this work now, only the city with soft and not hard soil under the city walls is suitable for this work. The city checkpoints in the south are okay, but in the north, some are not good because of geological reasons, such as the city checkpoints such as Huguan and Guantao, which must not be done like this. Because the foundation of these city checkpoints is on a piece of stony ground, if you want to dig like this, I don't know what year and month you will dig to? Only those foundations are on the soil of the city, is suitable for such siege means, Exian is located in the south, the territory of the waterways vertically and horizontally, as long as the tunnel is dug will not collapse, the use of this method is simply invincible.

When he first heard Wen Shang's tactics of war, Fu Quan thought of the Taiping Heavenly Kingdom that made the Manchus frightened in later generations, because their famous method of breaking the city was not the same as this method of breaking the pillar and breaking the city?

In his memory, Fu Quan remembered that the later Taiping Army didn't like the coffin city breaking method? They would dig tunnels under the foundations of the fortified city, and then use coffins to pile up explosives, directly blowing down the walls and gates of the city that the enemy was holding, so that they could not defend the city, and then assault the city to capture the city.

Compared with this broken pillar and breaking the city, the principle of the two is actually the same, isn't it? The difference is that there is no gunpowder in Fuquan now, and speaking of which, I have to mention that Fuquan once had the idea of making gunpowder in advance, after all, stirrups and horseshoes are inconvenient for him to build now, because they are too easy to imitate, but this gunpowder, unless you know the ingredients, it is difficult to imitate.

It's just a pity that he can't even remember the black powder formula in his previous life, let alone make it himself, so this thing can only wait for the descendants of this life to explore it themselves, after all, Fuquan is not a universal inventor or a universal plug-in, and he can easily get the artifact that destroys everything from space and system.