After repeatedly suppressing, encircling, and suppressing the outer areas, the reconnaissance unit gradually narrowed the reconnaissance circle by virtue of its more advanced tactical arrangements, and gradually confined the enemy to an area of about several kilometers around the stronghold.

At this time, the enemy's forces have been relatively concentrated, even if they have not carried out targeted training, they can rely on the patrol density to achieve support from all sides when one side is in difficulty;

And with the efforts of the apprentices, more sonic detection totems have been deployed, and a considerable part of the patrol team has the ability to receive "feedback sonic signals" at this time.

In this way, in the patrol area that has been compressed, many teams that seem to carry radar have formed a relatively tighter defense circle by frequently scanning each area.

This has greatly increased the operational costs of the reconnaissance brigade, and the insertable gaps left for them are becoming smaller and smaller.

However, after all, scanning cannot be carried out around the clock, and after locating the route and time of the patrol team, the brigade headquarters is trying its best to update the "safe route", and there are groups of reconnaissance teams that are testing back and forth along the safe route.

On the one hand, it's an attempt to get close to the base;

On the other hand, it is also to inform the upward peak of real-time changes in the situation.

And the stronghold, naturally, will not be indifferent to this.

If the assessment team did not "set" a task for the stronghold, then their best response at this time must be to shrink all into the city, or further reduce the patrol area to the area around the stronghold, so as to form a denser defensive circle.

But after all, they have a mission to do, so they can't deal with it in the most conservative way, so they choose to engage in a continuous confrontation with the reconnaissance force.

The two sides are constantly changing roles between hunters and prey, but the area under their control is stalemate in a ring forest 4 to 7 kilometers outside the enemy's base, and there is basically no advance or retreat.

However, the sound wave totem used by the trolls is not a high-precision modern radar after all, and it has certain limitations in terms of efficacy, frequency of use, and exploration distance.

For example, the physical strength of the person being inscribed determines how long it lasts.

The knowledge quality of the person who is engraved also determines the utilization rate of the collected signals.

After all, you can't expect a literate semi-literate person to be able to accurately identify every Mohu signal you "hear" and analyze what it represents.

Most complex signals have to be forwarded to trolls who have mastered the corresponding knowledge, such as apprentices, for special analysis.

And because of the same "knowledge reserve" reason, the vast majority of militia patrol members who have not received the corresponding education are actually unable to use the wave frequency code to communicate at medium and long distances.

Therefore, they can only do "short-range voice communication" within the maximum amplification of totems to language.

In this way, the former affects the timeliness of the message, and the latter causes them to communicate with each other like a sieve without confidentiality and effective enough.

Because of these and other factors, this is destined to be a system that is bound to have vulnerabilities and is prone to vulnerabilities, so that more elite and professional teams can find suitable opportunities in the seemingly impossible.

In the midst of repeated entanglements and temptations, Kunna and several other teams finally took advantage of the opponent's shortcomings to successfully bypass the enemy forces and gradually approach the periphery of the stronghold.

For the temporary No. 1 Brigade, this is also the first time that their subordinate reconnaissance team has included the near circle outside the stronghold into the scope of investigation.

In the case that the enemy also clearly has the same sound wave detection capability, the vicinity of the stronghold is undoubtedly a signal prohibition zone;

Because once a certain regular signal is frequently sent out from a certain area, the position of the reconnaissance team itself is equivalent to actively exposing itself to the enemy's field of vision.

Therefore, there are not many teams carrying out reconnaissance missions in this area, and the few teams that are there do not dare to contact each other too much, so the information can only be obtained by everyone's own strength.

Quinna's side, made

One of the several squads that had penetrated deep behind enemy lines, after carefully and time-consuming detours, discovered that this small city with a wall height of more than four meters had a secret gate in the northern area that was often locked in addition to the "main gate" that had previously existed in the mouths of the captives.

In the process, she felt a little puzzled, and always felt that something was wrong....

"Since every aspect of the exercise looks like the real thing, there must be a reason why this stronghold has to be placed here."

"And, what are the patrols patrolling for? If it were a real battlefield, would they really continue to maintain such a large patrol range under the continuous attrition?"

Or is there any reason in the setting that we can't get closer? Does this reason have anything to do with the secret door?"

As she pondered these questions, she and her two cover men were hiding in the shadows of the dense forest outside the city, looking at the vigilant forces on the north wall.

At that moment, there was a sudden and noticeable noise in the monitor, and Quinna understood that it was a sign that the enemy's sonic scans were about to slash across her area.

At such moments, they must immediately exit the scanning range or burrow into cover of the terrain that is complex enough to confuse their acoustic feedback.

Now, apparently there wasn't enough time for her team to retreat, so the three troll warriors were now digging into the underground pit dug at the scanning interval, ready to use the complex soil structure to evade.

"The interval is not right, the direction is not right..." Kunna was keenly aware of this before burrowing into the crypt, and therefore listened more carefully to the sounds of the outside world.

After a while, in more frequent scanning, a line of what appeared to be a group of twenty trolls, four wind wolves, and two four-wheeled troll transporters drove over them and headed for the secret door.

Taking advantage of the enemy's monitoring gap, Quinna glanced from a distance through the reserved lookout and found that it was indeed a convoy.

By this time, the secret door had been opened, and several teams of sergeants ran out of it, and after inspecting the convoy, they chose to let go, and closed the door tightly again.

After that, the Queena team monitored the area for two days and nights, and again observed the movement of two convoys, one out and one in.

There will be a reason for the discrepancy, what is this fleet transporting in the setting? Food supplies, or something else?

Quinna thinks that this convoy of transports entering the city through the North Secret Gate may be the reason why the stronghold exists and the patrol area is kept at its current size.

Then, it seems that this can be a breakthrough for your own side....

Thinking of this, she led the team to evacuate the area near the stronghold first, and reported her thoughts to Shangfeng for them to judge and choose.

This information was passed from the squadron all the way to the detachment, and after weighing the pros and cons, it was decided to try.

In the information submitted by Kunna, the convoy entered with real goods and left empty, going back and forth inside and outside the city gate with a not too high frequency.

Although the number of entries and exits is small, given the intensity of the team's reconnaissance, it is impossible to miss them if they have driven through their own controlled areas or passed near the tug-of-war ring between the two sides.

[In view of the general environment,

But in fact, in the previous reconnaissance activities, he had never found this line of trolls.

Therefore, its destination must be in the enemy's zone of control, and it is likely to be one of the reasons, or reasons, for the stalemate in the patrol range, as Kunna guessed.

So now, where their destination is is to be determined first.

It's better to have a goal than to fight a pointless bad battle, so the brigade mobilized enough forces to start scouting the path of the convoy.

Several squads were either stationed on the stake for surveillance, or remotely tracked, and finally confirmed a hidden camp where their destination was located.

Upon investigation, it was found that the convoy was removed

In addition to this, there were about a hundred hostile people in the camp..... At least that's the case in the surface area.

The news was quickly sent to Cui Wenli, and made her think for a while.

"This is clearly a key area with a good chance of big gains..... So, do you want to concentrate on a surprise wave?"

"No, as a reconnaissance force, when carrying out non-battlefield intelligence suppression missions, strong attacks should be avoided as much as possible, and the detection of sound waves underground is not so effective.... Perhaps, we should choose a smarter way."

After making such a judgment in her heart, Cui Wenli set the corresponding tone and began to discuss targeted countermeasures with the officers and intern staff officers of her command.

It wasn't long before her orders were sent to the detachments, and her forces moved on.

Nearly half of the combat escort forces of each squadron were concentrated, and with the cooperation of the reconnaissance team, the convoy heading from the main base to the sub-camp was ambushed in the middle, and then captured and interrogated as quickly as possible.

During this "interrogation", several new pieces of information were obtained by the troops on the mission.

[The members of the convoy escort have a close relationship with each other and are important comrades-in-arms. 】

[The convoy regularly goes back and forth at a fixed point, and the error usually does not exceed 20 light minutes. 】

[When entering the main base, the identity is more closely checked, but all the resources in the container will not be overturned for inspection; When entering a sub-base, the identity of the entire team is checked, but the identity of all members cannot be checked. 】

[The number of sergeants in the main stronghold is unknown, and there may be more than ten apprentice-level managers, and the number of spellcasters is in the single digits; There are three apprentice-level managers in the sub-base, more than 100 guards, ten wind wolves, and under the camp is a mine, among which there are many miners who are also capable of fighting. 】

[Due to the rarity of resources, the two managers will personally come forward during the transportation and monitor each other to check and record the goods. 】