The camp was built on a hill, and the other three sides were fenced off with high fences, except for the hill to the west.

At the foot of the mountain there is a wide meadow that serves as a place for the guard camp to graze their horses. At this time, Cao Bin came here with a trial version of a large firecracker to test the explosion.

This large firecracker is as thick as an adult's arm, more than 20 centimeters high, and the fuse on the outside is half a meter long.

The shell is made of green bamboo, and the middle is stuffed with two catties of black powder, and then capped with yellow mud, leaving a long fuse in the middle.

Originally, he was going to make a shell out of pig iron, but he was afraid that the gunpowder would not be powerful enough to explode. The paper shell is too fragile and not lethal enough.

So, he took a compromise approach, went to the mountain and cut a green bamboo, and took one of the sections as the shell.

Now, it's time to test its power!

"Hey, I can't imagine that I traveled back 2,000 years ago and would have the opportunity to set off firecrackers again, it's so interesting." After carefully placing the large firecrackers, Cao Bin took out the fire fold from his arms and smiled secretly.

After looking around, there was no one in the surrounding area, and there were no obstacles. He had chosen a direction and was going to run that way later.

Then, turn on the fire fold and with a flick of it, the flame appears.

"Sss

Seeing this, Cao Bin ran back quickly, and the fire fold couldn't be put away, and was thrown directly to the ground.

After running fifty meters, he quickly fell to the ground, holding his head with his hands.

"Boom!" The next moment, a roar of shaking mountains sounded, and the earth flew up. Immediately afterwards, a strong smell of gunpowder smoke spread, which was very pungent.

"Ahem..."Cao Bin coughed twice, covered his nose, and got up from the ground. When I got closer, I saw a large crater full of meters wide and forty or fifty centimeters deep exploded in the originally flat grass.

"I'm a good one..."Seeing this deep pit, Cao Bin couldn't help but smack his tongue secretly. If this thing is used to fry fish, or to blow up a dry toilet, it will definitely be very energetic.

If a person is blown up, he will have to shed his skin if he does not die. After this test explosion, it is enough to prove the power of the bomb, even if it is born hundreds of years earlier, it can still shock the world.

In the later stage, it is only necessary to follow this method, replace the shell with ceramics or other materials, and then improve the process, and then it can be officially put into use on the battlefield.

Think about it, if you set fire thousands of bombs in a split second and then throw them at the enemy. No matter how many of you are the world's first military general and the most courageous elite troops in the world, you all have to hate the Northwest.

In this way, it has become easy to unify the world. Thinking of this, Cao Bin's eyes became hot.

"Jun Sima..."

"Quick, Jun Sima is in the back mountain!" At this time, a group of people rushed up from the bottom of the mountain, led by Zhang Long and others.

They came running, with a hint of panic on their faces. But when they heard the loud roar coming from the mountain behind, everyone was startled.

Then I heard that the military Sima Cao Bin went to the back mountain alone, how dare Zhang Long slack off, and hurriedly brought someone over.

"Oh, here you are!" Cao Bin came back to his senses, regained his composure, and said vigorously.

"Hello military horse, salute!" Zhang Long took the other three brothers, as well as Deng Gouwa, and a group of people, a total of about 40 people, and saluted Cao Bin in unison.

"Stand upright, take a break!" Cao Bin returned the salute, and then asked, "What are you doing here?" ”

"Returning to the military Sima, the last general heard the sound of thunder in the back mountain, and was afraid that something would happen to the military Sima, so he brought his brothers over to take a look." Zhang Long stepped forward and replied loudly.

"I'm here to experiment with a secret weapon, and there's no danger." Cao Bin waved his hand and said with a smile: "You all go back." ”

"Oh? What secret weapon? Can it make a thunderous sound? "When everyone heard this, their eyes lit up, but they knew that there were some things they shouldn't know, so they shouldn't ask around.

Mahan was the only exception, he was not born to be a man of peace, asked.

"It's said it's a secret weapon, don't ask what you shouldn't ask!" Cao Bin glared at him and shouted, "Do you kid still want to do another five hundred push-ups?" ”

"Uh, I don't want to." When Ma Han heard this, he seemed to remember the fear of being dominated by five hundred push-ups last time, and quickly shrunk his neck and replied curtly.

"Alright, let's go back and continue training." Cao Bin waved his hand and walked towards the bottom of the mountain first.

"This... I have to go to Lao Cao..."Back in the barracks, Cao Bin sat on the chair and frowned.

Now that the test explosion has been a complete success, the next step is to consider how to expand production. The power of oneself is certainly not comparable to the power of a country.

If Cao Bin was to make it alone, even if he added those workers in the workshop, he wouldn't be able to make a few bombs a day.

But if you get Cao Cao's support and build hundreds or thousands of bombs a day, can't it be the same as playing? A few hundred a day, tens of thousands a month, and a dozen or two hundred thousand a year.

At the end of December, when Zhou Gongjin crossed the river and went north to capture Nanjun. Throw all these bombs at him and blow him up until he doubts his life!

"Yes, that's it, I'll go to Lao Cao." Thinking of this, Cao Bin stood up reluctantly. But soon, he sat back down.

He almost forgot that it was the first day of the Lunar New Year, and it was close to noon. At this time, Lao Cao was still in the palace to celebrate the New Year with his ministers.

Even if he went to the Prime Minister's Mansion, he couldn't see Lao Cao. He didn't want to get involved in the second generation of the Cao family, so he just gave up.

"It's better to talk to him about this tomorrow when I go to dinner with Lao Cao at noon." After sitting back in the chair, Cao Bin pondered: "It's just right, I'll make a few bombs as samples by the way, and let Lao Cao open his eyes tomorrow." ”

"That's it!" With a snap of his fingers, Cao Bin stood up excitedly, ready to go to the utility room behind the barracks to get materials and make bombs.

At this moment, the curtain of the barracks was lifted, and Hua Tuo walked in.

"Meet my lord." As soon as he walked into the barracks, Hua Tuo saw Cao Bin on the main seat and hurriedly saluted.

"It turned out to be Yuanhua, you are looking for Ben Sima, is there anything wrong?" Cao Bin was stunned, what Hua Tuo was doing here, it was so strange.

"The old man has questions and wants to ask the lord, I wonder if the lord is free now?" Hua Tuo hesitated for a moment, but still asked out loud.

"Oh? Yuanhua, if you have any questions, just say it. When Cao Bin heard this, he had to sit down again.

"Didn't the lord say some time ago that he would open two new courses and let the old man teach." Hua Tuo arched his hand and said, "The old man pondered, you have to prepare textbooks before giving lectures, and then you want to write textbooks." ”

"But I sat at the desk for a long time, I had no clue, I didn't know how to write, so I had to come to ask the lord." With that, Hua Tuo bowed deeply.