Lin Fei's military department quickly reported it, saying that they had some news. The department that was reported this time was Tianshidiliji, a subordinate of the Military Affairs Office, who monitored changes in the nearby land. This Tianshidilijiji is a department responsible for meteorological and geographical monitoring suggested by Jing Wen and Jing Wen. They are not only responsible for terrain surveying and mapping, but also responsible for providing sand tables to the commander, and even monitoring meteorological problems. It is better to say that when it rains, how heavy it rains, and what impact it has, they have to analyze it. They also have to monitor changes in land, such as changes in terrain, and various land problems. So their responsibilities are still very important. After all, in ancient wars, the right time and place is very important, and this demand for the right time and place cannot be changed until later generations, so Jing Wen also attaches great importance to it.

"Teacher Commander, we detected some problems with the land near the city!" said the geographical adviser.

"What's the problem?" Lin Fei asked.

The geographical consultant immediately said: "According to Lord Jing Wen, we can observe the habits of those animals to judge geographical issues. And we happened to observe that many earthworms were crawling out of the soil nearby, as if something stimulated them. So we will repay them immediately!"

"You mean someone digs a tunnel?" Jing Wen asked immediately.

Of course, Jing Wen knew that earthworms are generally relatively stable, unless they crawl out of the soil after it rains. But it is not raining now, but the earthworms crawl out, indicating that they are being stimulated. This abnormal change was discovered by these geographical staff and paid attention in time, so they came to report it immediately. Jing Wen immediately realized that there were probably some problems under the ground, so he crawled out. However, if there were any problems under the ground, there should be nothing.

According to the rules, if earthworms crawl out of the land, in addition to geological disasters, people dig tunnels. Or earthquakes are ready to occur. Earthworms will also have some abnormal behaviors. However, Jing Wen believes that there will be no earthquake. After all, the Northeast is not a high-incidence area. Could it be that Jing Wen is so unlucky and encountered an earthquake when he fought?

"Earthquakes are not impossible! But ordinary earthquakes are unlikely to cause us to suffer losses." Jing Wen speculated.

Although houses in ancient times were backward, they also had one advantage, that is, even if they were lost during earthquakes, they rarely killed people. Houses in the Tang Dynasty were made of wooden, and even if they were earthquakes, they could not cause too much damage to humans. Therefore, Jing Wen was not afraid of earthquakes. And as long as it was not a major earthquake, there would be no problem. The city walls would not collapse.

"Although the earthquake will not cause any major harm to us, if it is **, it will be dangerous!" Lin Fei said.

Jing Wen nodded and said, "Continue monitoring, take the listening urn to monitor carefully. If there is any news, please notify us immediately!"

The listening urn is an ancient monitoring method. You can use an listening urn to put it on the ground, and then you can hear the sound of far away places. Once there are a lot of footsteps or horse hooves, it means that the enemy's army is not far away. If someone digs a tunnel, it is easy to judge it. Jing Wen has known this kind of thing for a long time, so he asked these staff to use the listening urn to monitor it.

"Yes!" said the geographical adviser.

Jing Wen was already suspicious that this should be the Goguryeo people digging tunnels, which caused changes in these earthworms. However, Jing Wen was very disdainful of the Goguryeo people's behavior. Because their behavior was discovered by Jing Wen, what else can they do? Jing Wen was also glad that he developed the so-called staff system, which made no means of the enemy's means to hide.

The staff system established by Jing Wen can speculate and analyze the enemy in various aspects to ensure that he will not suffer heavy losses by the enemy's various means. The Goguryeo people are in line with the combat methods of the Central Plains, and they attach importance to the role of the main general. The ability of the main general in an army often represents the combat effectiveness of the army. Moreover, all work is distributed and arranged in the future, and the ordinary division of labor is not appropriate enough. Those troops are the main generals who think of something when they slapped their heads, and then the entire army will immediately turn around the main generals. This kind of army management model is actually very extensive and very dangerous. This management model is either a big victory or a big defeat. Because of this extensive management, once the main general neglects certain places, it is captured by the enemy, and a big defeat is inevitable. Only a small number of cautious main generals can keep the army as far as possible without loopholes, so as to protect the entire army.

However, Jing Wen's staff system can allow various staff members to replace the main general for actual management, so that they can make various arrangements, and even if the main general does not order, they will take the initiative to work and have their own division of labor. This is completely different from the staff members of other military personnel. The staff members are just guest officials of the main general. They can only have actual work after the main general assigns tasks, and they will be idle once they are not assigned. Therefore, the staff system is much better than the staff members, which can ensure that there are no loopholes in every place as much as possible.

Two hours later, the geographical consultant came.

"Teacher, we heard the news. As expected, the Goguryeo people were digging tunnels. If we expected it was right, their tunnel entrance was behind a small hill bag not far away." The geographical adviser pointed to a small hill bag about ten meters high in the distance.

Jing Wen looked at the hill bag and smiled. They actually used the hill bag to cover Jing Wen and the others' sight. But their eyes can deceive people, but their ears will not deceive people, and geological changes will not deceive people.

"Can you figure out where the end point of their tunnels are?" Jing Wen asked.

"Yes, we can quickly figure out the end point of digging tunnels." said the geographical adviser.

Lin Fei immediately asked, "Jie Shuai, do you want to use the trick?"

"Of course, since they have given us a face to beat us, then if we don't slap them hard, how can we be worthy of their efforts! Hahahaha..." Jing Wen said with a laugh.
Chapter completed!