Half an hour later, Yan Qing entered the safe room and said respectfully, "Master, I have dug under the city wall." ”

"Hmm." Ruan Yanluo nodded, got up and walked towards the tunnel.

The soldiers of the Changfeng Army were sweating one by one, their clothes were wet for several layers, and they were panting, obviously Yan Qing had trained them a lot just now, and they couldn't stand up when they were a little tired, leaning against the wall to support themselves.

But when he saw Ruan Yanluo walking in, he stood up stubbornly and looked at her defiantly.

Use Yan Qing to press them, they don't accept it!

Ruan Yanluo ignored them, just carefully checked the reinforcement measures of the cave wall, and casually pointed out a few unstable places, so that Yan Qing stared at the person and corrected them immediately, and then walked to the end of the tunnel and looked at the foundation of the huge city wall seriously.

After a while, Ruan Yanluo drew a few points with charcoal on the bluestone city wall and said to Lu Xiuyi: "According to the method I taught you, you can't make a mistake at all by digging these points deeply." ”

"Yes!" Lu Xiuyi ran back and carried a large box out, and took out a small jar that was extremely tightly sealed from the box.

Wrapping a cloth around the top of a wooden stick, Lu Xiuyi carefully dipped the liquid inside and applied it to the dots drawn by Ruan Yanluo.

The people of the Changfeng Army around looked at it curiously and with a little disdain, although they didn't know what was in that small jar, but this idiot county lord shouldn't think that he would wear it if he smeared a little lapis bluestone, right?

However, to their surprise, after those things were smeared, in just a few moments, there was a sizzling sound on the bluestone, and bubbles bubbled on the surface as if it were boiling water.

Lu Xiuyi glanced at them with disdain, these people actually dared to say that the county lord was a fool, how did they know that Ruan Yanluo was the smartest person he had ever seen in the world.

A few days ago, Ruan Yanluo went to Qingyutang and handed him a drawing, and asked him to build two square furnaces about two feet apart according to the drawings, one of which had a copper plate in it, and sealed it after it was fixed, leaving only one pipe to pass into the other square furnace, and the other square furnace burned sulfur with a blazing fire, and then used a fan to fan all the smoke into the square furnace with copper plates.

When the furnace cooled down, these liquids with a pungent smell appeared in the copper plate, Lu Xiu didn't know what it was at first, and wanted to touch it with his hands, but fortunately Ruan Yanluo stopped it in time, and when he saw Ruan Yanluo smearing these liquids on the ground with a wooden stick wrapped in cloth, and the ground began to dissolve instantly, he was secretly frightened and afraid.

Fortunately, Ruan Yanluo stopped him, otherwise his hand would have been useless.

Changfeng Jun saw that the bubbles on the bluestone were getting fewer and fewer, and when he was about to run out, Lu Xiuyi used a cloth to protect his hand firmly, and used a small dagger to pry it, and the bluestone, which was originally as hard as iron, was like tofu, and he easily pried off a piece.

Changfeng Jun's eyes were straight, they couldn't have imagined that there was such an ingenious thing in this world, with such a thing in hand, Ruan Yanluo said that he could dig through the city wall, but it was not fake.

Lu Xiu pried it a few times, and the corroded bluestone was pried up, and the inside was still extremely hard.

The people of the Changfeng Army were surprised at first, but when they saw this, they couldn't help but show disdain, so little by little, they wanted to pry until the Year of the Monkey? And that small jar is only a little bit, enough to corrode how many bluestones?

There was a soft laughter around him, and Lu Xiuyi knew what they were thinking, but he didn't bother to pay attention to it at all.

The county lord does things like flying immortals out of the sky, how can they be guessed by these reckless people?

He ignored the voice of Changfeng Jun, and on the points that Ruan Yanluo painted, he painted a liquid that Ruan Yanluo called sulfuric acid little by little, and carefully chiseled inward little by little.

In a short time, more than a dozen slender holes were carved into the wall. Lu Xiuyi measured it with a wooden stick that had been calculated in length, revealing a satisfied look.

"County Lord, it's all ready." He turned to Ruan Yanluo and said.

"Hmm." Ruan Yanluo nodded and said, "Everyone evacuates from here and goes to the safe room." ”

The Changfeng army all showed unwilling looks, they still wanted to see what Ruan Yanluo could do to dig up the city wall, but Ruan Yanluo wanted to drive them away.

"If you don't want to die, I advise you to listen to the county lord!" Lu Xiuyi snorted coldly, packed up his things and walked to the safe room first.

He had seen the power of the thunder fire bomb, and this time Ruan Yanluo personally adjusted the ratio and dosage of raw materials, and made something several times stronger than the power of the thunder fire bomb, and prepared a lot.

So many powerful thunder bombs exploded together, and that scene made people's hearts palpitate just thinking about it.

More than a hundred Changfeng soldiers looked at each other, Yan Qing's face turned dark, and he said coldly: "What are you doing in a daze?" Didn't you hear what the master said? ”

Yan Qing had extremely high authority among them, and even though he was reluctant, he still went to the safe room one by one.

Ruan Yanluo drove Lan Yue Lanxing away, and when he was only one left, he took out the things he had prepared in advance, carefully stuffed them into the holes in the city wall one by one, and then pulled out the lead for a long time, pulling it back as he went, until he retreated to the side of the safe room.

"Fire Fold." As soon as Ruan Yanluo stretched out his hand, Lu Xiuyi immediately handed the thing to her hand.

Ruan Yanluo glanced at the Changfeng Army in the room, and said in a cold voice: "Plug your ears, open your eyes wide, and see if the county lord is worthy of being your master." ”

The fire fold was lowered and the fuse was ignited.

The lead sparked like a scurrying snake and rushed towards the bluestone at the end of the tunnel, Ruan Yanluo plugged his ears with the cotton handed by Lan Yue, and his eyes were staring tightly.

"Boom!" After a dull sound, the tunnel shook the mountains, and a room of people couldn't stand at all, and they crashed into the people next to them, all of them staggered, and many of them shook directly to the ground.

Large pieces of rubble burst out of the walls and smashed everywhere, and earth and rocks fell from the top and sides of the tunnels, and if it weren't for this safe room, all the people here would have been buried underneath.

Ruan Yanluo was also shocked to stand unsteadily, but just for a moment, she grabbed the edge of the safe room and stood up straight, staring closely into the tunnel.

She didn't worry about whether the city wall could explode at all, and she knew how powerful it was when she mixed it up with her own hands.

What she is worried about is the safety of the tunnel, although she has made Lu Xiuyi strengthen the tunnel as much as possible according to modern construction technology, but she is still not sure if she can withstand the powerful impact of this kind of Cheng Dù.

If the tunnel collapsed, then everything she did would be in vain, and she had to arrange for the people of the Changfeng Army to leave the capital immediately at the fastest time, so as not to be killed by the Tianyao defenders.

A word to readers:

Does anyone know what Yanluo makes out of a square furnace?

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