Looking back at Pei Changqing and Wang Lun, after the two of them entered the Hengguan Mountain Range, they touched the position where the fourth group was attacked, according to the prisoner's confession, a cave should be seen not far from this side, they used to have a unit of the corps stationed in concealment here, because the fourth group was not far from them, so their squad leader sent these five people to capture this group, and if they encountered resistance, they could solve it on the spot. However, their team leader was playful for a while, so they all got into it.

After Pei Changqing took Wang Lun to this position, he began to cautiously probe forward, and sure enough, he encountered some early warning traps, as well as some guards, but these two people did not move these things, one is more troublesome, and the other is easy to show their whereabouts.

After bypassing these guards, these two people slowly approached this cave, this cave is still quite hidden, and if you don't look carefully, you can't see where the cave entrance is, but compared to the periphery, the guard at the entrance of the cave is actually a lot less, probably thinking that their periphery is safe enough, and the inside is lax. Wang Lun and the two of them found a big tree around the entrance of the cave and quietly climbed up to hide it. Begin to observe the pattern of people entering and exiting the cave entrance so that they can infiltrate later.

After a period of patient observation, Pei Changqing discovered some patterns, and then motioned for Wang Lun to gather, and Wang Lun also carefully moved from his hiding place to Pei Changqing's hiding place.

"Wang Lun, after observation, they will replace the perimeter guards every once in a while, fortunately we didn't move those people before, otherwise we would have been alarmed. Now make a plan, you continue to hide here as a support at any time, I will sneak inside to see the situation after their next shift change personnel come back, if it is discovered, I will withdraw as soon as possible, the trees on our side are still dense, I will go down and prepare some traps to delay the pursuers who will appear if there will be, but I will not arrange behind the trees, so that we will not be affected when we retreat by ourselves, you first guard here if someone comes, you warn me. ”

"Okay!"

Pei Changqing watched a group of soldiers walk out of the entrance of the cave, then jumped down from the branch where he was hiding, quickly hid in the tall grass below, and after observing to make sure that no one saw him, he began to set a trap, in fact, it is also very simple, it is some potholes and the like that are relatively simple but can only be delayed traps. As for the current equipment of the lethal trap, it can't be done.

Pei Changqing did not return to the tree after arranging, on the contrary, he moved towards the entrance of the cave, and found a hidden place near the entrance of the cave to hide, just after he finished hiding, the soldiers who changed shifts walked back, and the leader first observed the surrounding situation, and after confirming that there were no followers, he walked into the cave, Pei Changqing also followed up not long after they entered, and only Wang Lun was left on the periphery. But Wang Lun was not idle, he turned around and slid down the trees, and cleared a hidden road behind the trees, and marked some red dots on some trees next to the road, one red dot on each tree, and filled some hidden weapon boxes that he had received from the quartermaster department with hidden weapons, turned on the switches and installed them around these markers, and each mark made a lead from it and connected it to the switch of the concealed weapon box, and adjusted the angle of the concealed weapon box to aim at the road, Wang Lun probably calculated the speed and time and then assembled all of these, and also made some simple traps around the hidden weapon box to prevent wild beasts from entering and destroying the hidden weapon box, after all of them were done, Wang Lun looked at the surrounding situation, confirmed that there was no accident or the personnel found it, and quickly returned to the previous tree according to the road markings and hidden.

In fact, all he arranged were mechanisms to slow down the opponent's pursuit, and he installed eighteen of the twenty hidden weapon boxes he had obtained from the quartermaster department here, extending a long distance, trying to block the enemy until he lost the target, and the reason why he left the two was a backup.

While he went to arrange the mechanism, Pei Changqing followed the soldiers who came back from the shift change into the cave, this cave should not have been dug the day after tomorrow, but before, the road inside was bumpy, and there were many stone crevices where they could hide, generally speaking, this is the residence of some beasts, and now the former legion sent troops to kill all the beasts here, but Pei Changqing followed for a long distance and did not find any traces of garrison, and this group of soldiers did not seem to have the intention of stopping. It seems that the garrison should still be far away.

Just when Pei Changqing followed, suddenly, the soldier in front seemed to feel something, and turned around suddenly, so frightened that Pei Changqing hurriedly hidden, but the soldier didn't seem to find Pei Changqing's traces, just casually glanced at it and turned around and continued to walk, but Pei Changqing's dodge was stuck in the crack in the stone and couldn't get out, and he didn't dare to make too much movement, so he had to move out full, and when he moved, his foot accidentally kicked on a stone groove, this kick doesn't matter, The stone behind him suddenly opened a gap, and Pei Changqing, who had finally moved out, fell deeper like this.

Pei Changqing's fall, almost didn't break the bones apart, lying on the ground for a long time before relieving, but it was dark all around, Pei Changqing took out an ignition stick from his backpack, and after lighting it, the firelight lit up the place a little, this is a hand-dug secret room, there is a table inside, there is a big cabinet behind the table, full of books, there is a half-burned candle on the table, after Pei Changqing lit this half of the candle with a lighting stick, he found that this should be a secret research place, But no one used it for a long time, a lot of dust fell all over the bookcase and table, Pei Changqing casually took a document on the table and blew off the soil on it, he found that this was a recipe for a potion, although he didn't know what was written, but his intuition told him that this was very important, and the reason why the legion sent troops here in the past was probably this secret research room, but they didn't find it, Pei Changqing This can be regarded as a blessing in disguise, if it weren't for the soldier's sudden turnaround, he wouldn't have been stuck in the crack of the stone, You won't find this place.

Pei Changqing hurriedly read the documents on the table, all the useful ones were put into his backpack, and he also looked at the bookshelf, and put the research results into the backpack, in fact, this is basically the research process, and the results account for a very small proportion, but the process cannot be put in vain for such people to find that Pei Changqing saw that he really couldn't take it away, so he destroyed it all on the spot, and just like that, he also filled a backpack full of things. After Pei Changqing blew out the candle, he took the short sword in his hand, because just now he forgot how long he had been in and didn't know what was going on outside, so he was ready for battle, and at the entrance, he also made some hidden weapon boxes, contact mechanisms, and three ignition traps as Wang Lun arranged outside, if someone touched these three ignition traps by mistake, this place would be instantly ignited.