It's this routine again....

Cao Cao couldn't guess that his genius son had any whimsical ideas to break Yuan Shao's dirt mountain.

However, in view of all kinds of "lessons from the past", since the son dares to boast about Haikou, he is sure of victory.

"Okay, let's follow the old rules, I don't ask, just follow what Ziyou said. "

Cao Cao also had a long memory, and no longer asked Cao Yuan what means he had.

It's useless to ask anyway.

At that moment, Cao Cao ordered to immediately mobilize craftsmen to set up another camp south of Guandu to build trebuchets.

In the next month, Cao Jun's life was indeed not easy.

Yuan Shao relied on the condescending momentum of the earth and mountains, and took in the Guandu Cao camp, where the trebuchet and arrows were to fight.

The entire Cao camp was bombarded to the point that it was unbearable to see.

Tens of thousands of Cao soldiers could only huddle under the earthen wall tremblingly, enduring Yuan Shao's bullying with stone bullets and arrows, which was unspeakably miserable.

The morale of the Yuan army is gradually rising.

And Cao Jun's fighting spirit is constantly declining.

...

In the blink of an eye, January has passed.

Inside the big tent of the Chinese army.

Cao Cao sipped the wine in his glass, held the military book in his hand, and looked calm and relaxed.

"Boom, boom!"

From time to time, I heard the sound of trebuchet bombardment, and the ground shook beneath my feet.

Cao Cao turned a blind eye and still looked idle.

Xiahou Yuan, Cao Hong and other generals left and right, but they became more and more angry.

"Mengde, we have endured it for a month, and the soldiers are holding their breath. "

"When will Ziyou break through the soil mountain of the Yuan thief, and if he continues like this, the soldiers' military spirit will collapse. "

Xiahou Yuan finally lost his breath and asked anxiously.

The generals joined in.

Cao Cao said lightly: "Miaocai, don't you know your niece-in-law's methods, don't worry, calm down." "

Xiahou Yuan scratched his head and said, "Mengde, it's not that I don't believe in Ziyou, it's just..."

The voice did not fall.

Dian Wei Xing rushed into the account and shouted: "Qi Yu Sikong, Ziyou Junshi sent someone to report that his sharp weapon to break the earth mountain has arrived outside the south gate, please go and watch." "

Cao Cao's spirits were lifted.

The generals were also excited.

Cao Cao didn't have time to think about it, so he took the generals out of the tent and went straight to the Nanying Gate.

In front of the camp gate.

Cao Yuan arrived first and waited for a long time.

"Ziyou, where is your earth-breaking weapon, let me take a look?"

Cao Cao couldn't wait to ask.

"The sharp weapon is too big, and it can only be transported in if the camp gate is removed, and if it is dragged into the camp, it will be destroyed by Yuan Jun's trebuchet, so it can only be parked outside the camp. "

Cao Yuan pointed towards the gate outside the camp.

Cao Cao and the generals followed Cao Yuan's point and looked outside the camp gate.

A behemoth, towering like a mountain, sits immensely outside the camp gate.

The crowd was in an uproar.

Cao Cao was even more surprised: "Ziyou, this sharp weapon, could it be... Is it a trebuchet?"

"Yes, it's a trebuchet. "

Cao Yuan nodded slightly.

Cao Cao's eyes flashed, and he rode out of the camp and looked around the trebuchet, his expression becoming more and more surprised.

"Ziyou, your trebuchet seems to be much bigger than the trebuchet I asked the craftsmen to build?"

Cao Cao saw something unusual.

Guo Jia also said: "Sikong, this trebuchet is two to three times that of an ordinary trebuchet, and the process structure seems to be quite different. "

Cao Cao looked back at Cao Yuan with a curious gaze: "Ziyou, what's going on with this thing?"

"This thing, indeed, is a trebuchet. "

"It's just a new type of trebuchet that I improved on the existing trebuchet by using the principle of lever counterweight. "

"I named this trebuchet Tianwei Cannon!"

Cao Yuan said unhurriedly with a smile on his face.

This trebuchet was actually originally called Xiangyang Cannon.

In the original history, it was the counterweight trebuchet that was invented when the Mengyuan army broke through the Xiangyang City of the Southern Song Dynasty.

Because this trebuchet was first put into use during the attack on Xiangyang City, it was called Xiangyang Cannon.

This thing is arguably the most powerful and long-range trebuchet ever built.

A veritable king of trebuchets.

And this Xiangyang cannon is the artifact that Cao Yuan obtained by using the small treasury gain system from the greedy ordinary trebuchet.

"Matched.... Counterweights?"

"Bar... Leverage?"

Cao Cao said with a blank look in his eyes: "Ziyou, I don't understand what you said at all, you just say that you are a powerful cannon, what is so powerful." "

Cao Yuan didn't explain much, and slapped the trebuchet.

"This Tianwei cannon can throw 200 catties of stone projectiles, and the range can reach 150 steps. "

"Our army uses this cannon, which is enough to easily destroy Yuan Shao's earth mountain outside the range of Yuan Shao's trebuchet!"

Cao Yuan pointed out the power of the Tianwei cannon.

Everyone was amazed.

Two hundred pounds of stone bullets.

A distance of one hundred and fifty steps!

These two figures are completely beyond the comprehension of Cao Cao and the strategists.

In their impression, the strongest trebuchet in the world at that time weighed only forty pounds and could shoot a distance of seventy steps.

Cao Yuan's heavenly cannon weight was five times that of the cannon.

The range is twice as long.

What a horrible weapon this is!

"Is this heavenly cannon really so powerful?"

Cao Cao looked up at the trebuchet in front of him, gasping and looking surprised.

"If Sikong doesn't believe it, we might as well give it a try. "

Cao Yuan arranged for the soldiers to load the stone bullets prepared in advance on the trebuchet and face the direction outside the camp.

The stone bullet is loaded, the counterweight is loaded, and the hook is removed.

Woo –

There was a loud crash.

Two hundred pounds of stones roared into the air, passed a distance of one hundred and fifty paces, and fell heavily to the ground.

The moment it landed, the ground shook and the mountains shook, setting off the dust in the sky.

On the ground, a three-foot-deep pit was smashed out.

This kind of power made Cao Cao and all the strategists and generals couldn't help but take half a step back, and their expressions were terrified.

"Sikong, the power of the Heavenly Mighty Cannon is barely comparable, and it should be able to destroy Yuan Shao's earth mountain. "

Cao Yuan looked as usual, and looked back at Cao Cao with a light smile.

Cao Cao was stunned for a long time, and his eyes swelled with ecstasy.

"What does it mean to barely make peace, this heavenly cannon is really an artifact, and it is easy to collapse Yuan Shao's earth mountain!"

Cao Cao was so excited that his voice was hoarse.

He patted Cao Yuan on the shoulder and asked curiously, "Ziyou, what kind of craftsman made your heavenly cannon?"

"Actually, there is no one else, I just thought about it for a few days, and I made it by mistake, but I didn't expect the power to be good. "

Cao Yuan had to say so perfunctorily.

Cao Cao's expression was shocked, and he looked at his son again with an amazed gaze.

First it was the Divine Arm Bow, then the Mo Knife, and now it is the Heavenly Cannon!

Every weapon created by Cao Yuan is a divine weapon that has never been seen before.

"Yuan'er, Yuan'er, how many wonderful ideas are still in your genius head, and how many surprises do you have to give your father...."

Cao Cao looked at his son in surprise, sighing in his heart.

"Sikong, Ziyou Junshi's heavenly cannon, it is really an artifact to restrain Tushan. "

"This cannon is enough to destroy all his earth and mountains beyond the range of Yuan Shao's trebuchet. "

"However, I think that the craftsmanship of this Tianwei cannon is complicated, and it should not be easy to build, and if we want to build enough quantities, we may have to survive for another month or two. "

Guo Jia's eyes were sharp, and he saw the power of the Tianwei cannon, but he also saw the difficulty of its manufacturing.

Cao Cao nodded slightly, but said: "Then stay up for another two months, pass the order, transfer all the craftsmen from the counties south of Guandu, and give me a day and night to build this heavenly cannon." "

"Sikong doesn't have to make a big deal out of it. "

Cao Yuan stopped with a smile, "I have asked my private craftsman to build thirty Tianwei cannons, and when Sikong gives an order, they can be transferred immediately and break Yuan Shao's dirt mountain." "

The crowd was shocked again.

Cao Cao Qi said: "Such a complicated and exquisite trebuchet, in just one month, Ziyou has built thirty?"

"Well... In fact, I used the assembly line construction method, so the manufacturing speed was accelerated several times, so that I could build so much in one month. "

Of course, it was impossible for Cao Yuan to tell Cao Cao that these heavenly cannons were obtained by him in the blink of an eye with system gains.

He could only make up something like an assembly line, something that Cao Cao couldn't understand, to prevaricate.

"Stream... Pipeline?"

Cao Cao was really confused again, and his face was dazed.

Cao Yuan said with a smile: "None of this is important, the important thing is to break Yuan Shao's dirt mountain as soon as possible, so that the morale of the soldiers will continue to be low." "

Cao Cao was reminded, and the confusion in his eyes turned into a heroic murderous intent.

"Okay, according to what Ziyou said, transfer all your Tianwei cannons immediately, and let's give Yuan Shao a big surprise!"

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