Peek at my diary, Cao Cao dominates the Three Kingdoms

Chapter 452 It only takes a moment to break the city!
But after Lu Yan said so much, there is still a hurdle that cannot be avoided.

Therefore, Xun You asked everyone's doubts: "But Lu Huqi, the city of Ye is high and deep, with complete defenses. We can't even break the city, so how can we kill Yuan Shao?"

"Actually, there's no need to kill him. He'll burp by himself in two or three years." Lu Yan muttered in his heart.

But the problem is, they want Yuan Shao to die right now, and they are in a hurry
If you want to kill Yuan Shao, you must at least break the city first. If you can't break the city of Ye before the arrival of the army, then this time the Northern Expedition, which is mobilizing a large number of troops and consumes a lot of money, may be in vain.This is the biggest doubt and worry in everyone's mind.

Lu Yan smiled slightly, and said, "Don't worry, Gongda, I have my own way to destroy the city."

Xun You nodded, and asked again: "Also, after breaking the city, how can we prevent Yuan Shao from running away?"

Although Cao Jun besieged Yecheng on all sides, if the tens of thousands of troops in the city rushed out, it would not be easy to stop them.

At that time, Yuan Shao would not be able to find him as long as he was wearing the armor of a soldier and mixed in with the army.

Lu Yan replied again: "Give me a few days to prepare, and with the help of night, I can destroy the city wall in an instant.

When the city wall collapsed, the cavalry could rush into Yuan Shao's mansion at the fastest speed, and by surprise, Yuan Shao definitely had no time to escape. "

"Mr. Lu, are you really so sure?" Cao Cao reconfirmed.

"Eighty or ninety percent!" Lu Yan replied affirmatively.

Now that Lu Yan was so confident, Cao Cao no longer doubted, "In that case, Zhao Yun, Xiahoulan, Zhang Liao, Xiahouyuan!"

Hearing Cao Cao's roll call, Zhao Yun and the other four immediately strode forward, clasped their fists and said, "The last general is here!"

"Let the four of you lead the cavalry of the headquarters and be ready for night raids at any time!"

"Here!"

After receiving the order, Xia Houyuan asked doubtfully again: "But Lu Hussar, what shall we use as a signal then?"

Lu Yan replied: "Take the light of the fire and the loud noise as the name, but be more careful about the gravel on the ground."

"Gravel?" Xia Houyuan was very puzzled, and a big question mark appeared in the hearts of the others.

But Lu Yan didn't explain, and they didn't dare to ask more.

With Zhao Yun, Zhang Liao, Xia Houlan and Xia Houyuan leading away, Cao Cao also dismissed the meeting.

After Lu Yan left the tent of the Chinese army, he found several scouts from the Dragon Rider Battalion and ordered them to return to Chenliu to bring the gunpowder as quickly as possible.

At the same time, Lu Yan also recruited all the artisans accompanying the army and asked them to make tin cans for gunpowder.

Gunpowder is a mixture of potassium nitrate, sulfur, and charcoal.

The reason this mixture burns so easily is because potassium nitrate is an oxidizing agent, releasing oxygen when heated.

Sulfur and charcoal are easily oxidized and are common reducing agents.When they are mixed and burned in an optimal ratio, the oxidation-reduction reaction proceeds rapidly, and high heat and a large amount of gas will be released during the reaction.

At this time, the gunpowder is placed in a limited space, and when it burns, its volume suddenly expands, increasing to thousands of times, and an explosion will occur.This is how black powder burns and explodes.

Just dig a slightly deeper hole under the city wall and put explosives under or near the city wall. Once there is enough black powder to detonate, the city wall will definitely not be able to withstand the power of the explosion and collapse.

Black powder combined with tunnel blasting can completely blow down city walls, and it has been used in many battlefields in later generations.

After figuring out the tactics, all Lu Yan has to do is wait for the gunpowder to arrive.

Fortunately, with the efforts of the scouts, Lu Yan did not wait too long.

The scouts were all one man and three horses, and under the whip of the horse, it took less than five days to bring a hundred catties of gunpowder to Lu Yan.

The gunpowder is wrapped in a layer of paper on the inside, and wrapped in oilcloth on the outside, which is very well sealed.

But even so, Lu Yan couldn't help sweating on his forehead when he saw them. But these are all caused by Lu Yan's psychological factors, and the black powder will not spontaneously ignite and explode due to some bumps.

Putting the gunpowder into the tin cans prepared in advance, and mixing some gunpowder with paper to make a long lead wire, Lu Yan went to a deserted place alone to conduct experiments.

"Boom!!!"

There was a violent explosion and a violent flash of white light. Accompanied by shock waves and mud splashing everywhere, Lu Yan finally breathed a sigh of relief and secretly said: "It's done!"

At this moment, Boss Cao was looking at the floor plan of Yecheng in his tent, when a "thunder" sound suddenly came from a distance, interrupting Lao Cao's thinking, "Thunder is thundering, is it going to rain?"

Thinking that the rain would affect his actions, Cao Cao opened the tent and went out after thinking for a while, deciding to check the weather conditions.

"If it rains, I'm afraid Mr. Lu's plan will have to be delayed for a while?" Cao Cao stepped out and looked at the sky, "No, the sun is so bright, how can it look like it's going to rain?"

When Lu Yan returned to Daying, he happened to see Cao Cao who was puzzled, and said, "Mr. Cao, you can act tonight."

"Can we act tonight?!" Cao Cao's eyes flashed, and he ignored the strange thunder just now, and said, "Okay, I will immediately notify Miaocai, Wenyuan. Zilong and Ziheng will be there. Please sir!"

"Here!" Lu Yan answered with cupped hands, turned and left.

The moon is dark and the wind is high tonight, which is a good time to do something.

Lu Yan led a group of craftsmen and sneaked under the city wall under the cover of night with an engineer shovel.

People in this era generally have night blindness, which means that they cannot see clearly or see things at all in dim light or at night.

But the craftsmen eat very well on weekdays,

On weekdays, green leafy foods, eggs, animal livers, etc. are all eaten, so these people basically do not have night blindness.

Under the cover of darkness, more than a dozen craftsmen quickly dug the tunnel for the explosives with the modern artifact sapper shovel.

Put more than a dozen dynamite jars in, and if the city wall doesn't collapse, Lu Yan can even broadcast his meal upside down live.

After confirming that all the explosives were ambushed, Lu Yan counted down the timer and asked all the craftsmen to ignite the fuzes at the same time!
The lead time is less than 1 minute. At this time, how far everyone can run depends entirely on personal ability.
The fuse was ignited, and a little flame came out.

The voice of "呵呵呵!!!" sounded to Lu Yan's ears, it was no different from the footsteps of the god of death!

These craftsmen didn't know if they were too nervous, but they stared at the sparks from the fuzes and commented: "It's so beautiful!"

"Yes, it's so beautiful!"

Lu Yan couldn't help it, and shouted loudly: "What are you doing in a daze! Run away!!! You're going to die!"

"Ah! Will people die?"

"Run!"

As soon as they heard that someone was about to die, the group of craftsmen immediately turned around and ran away.

"boom!!!"

"boom!!!"

"boom!!!"

And just when they crossed the trench and just ran out of a range of more than [-] meters, there were several shocking "thunders" behind them! ! !
　Thanks to the book friend [20170518001713893] for the reward
　　
　
(End of this chapter)