Knowledge is power, this is what Tai Jizi once said, Li Yi thought it was true.

Just now, at the request of Jing Ziyi, Li Yi tried to use the trebuchet on the city wall to strike at the grassland cavalry vanguard in the earthen fort area outside the Great Wall.

Before Li Yi came to the trebuchet, he began to make various comparisons, which made the people around him confused.

After Li Yi had been gesturing for a while, he found another stone and squatted on the ground and began to write some words that they couldn't understand at all.

The text looks strange, like ghost drawings.

"Did this kid draw a talisman to pray to God before launching?"

Qi Chao leaned into Qi Ning's ear and whispered.

"I think it should be, he said that his master is a Taoist person, isn't this painting talisman to God is the unique skill of the Taoist priest!"

Compared with Qi Chao's small voice, Qi Ning obviously said it loudly on purpose.

The soldiers who watched the excitement around them all burst into laughter.

They also wanted to know if the kid in front of them could really use this return cannon to shoot wherever he wanted.

Only one person in the audience could read the words.

This person is Jing Zizheng, after all, he is from the same school as Li Yishi, although he didn't like these miscellaneous studies when he was in the mountains, but he still learned mathematics.

But although he could understand the numbers, he couldn't understand the formulas written by Li Yi at all.

After a short time, Li Yi finished the calculation, and now as long as he can refine the throwing strength of the trebuchet, he can freely adjust the falling point of the trebuchet.

So he chose one of the trebuchets, adjusted the force of the trebuchet to the maximum, and released the machine and launched it.

I saw that the round stone drew a graceful arc in the air and flew over the head of the vanguard cavalry of the steppe tribe.

He put his hands on the pergola and paddled his feet, watching the final landing of the flying stones.

In this way, he combined with what Jing Ziyi said just now, the landing point of the trebuchet is the area where the thistle terrestris is sown, and he quickly calculated how far the afterburner can fly with each revolution.

Looking at the stone projectiles flying above their heads, the steppe cavalry vanguard rode on their horses and let out an unbridled mockery.

In the past, they had sacrificed many people in this area full of thistles and tripping horses, and half of them were killed or injured by stone bullets falling from the sky.

Li Yi looked at the grassland cavalrymen who were constantly making all kinds of insulting actions to himself, and the corners of his mouth couldn't help but turn up slightly.

"Since you are looking for your own death, don't blame me for being ruthless, I hope you won't be so arrogant in the next life."

He muttered quietly, then turned the winch to find a stone bullet that weighed his own weight, and then adjusted his direction and pulled off the transmitter.

With a "boom", a stone projectile the size of a watermelon was ejected, and the stone bullet drew a graceful arc in the air again.

The vanguard of the steppe cavalry all looked up at the stone bullets flying in the sky at this time.

According to the practice of previous years, it took several rounds of these return cannons on the walls of the Dayu Dynasty to cover the area.

So they still have plenty of time to charge through the area.

It's just that the centurion of the vanguard at the front of the line, when he watched the stone bullets in the sky get bigger and bigger, a bad feeling welled up in his heart.

By the time he reacted and was about to speed forward, the projectile had already slammed into his horse's head.

The huge impact force immediately smashed the head of the war horse into the ground, and blood mixed with the war horse's brain splattered everywhere.

And the cavalry on the war horse also flew out because the war horse suddenly knelt down.

Coincidentally, his face happened to have an intimate contact with an iron thistle on the ground.

The sharp thistle pierced his jaw in an instant, and the spikes pierced his tongue from the west side of his tongue.

'Centurion!'

A group of steppe cavalrymen shouted in panic, they didn't expect their centurion to be directly hit by the second return shot.

"No one is lucky."

All the steppe cavalry thought in their hearts that their centurions were really unlucky.

But before they could finish gloating, Li Yi's second projectile cannon was fired out again.

This time, the flying stone projectiles killed one of the cavalrymen at the back of the vanguard army on the spot.

He was much more unlucky than the centurion at the front of the team, after all, he enjoyed the same treatment as the centurion's warhorse.

Seeing that one of the guys at the back was killed by a stone bullet, the group of cavalry vanguard immediately began to prepare for a charge.

But before they could discuss how to deal with it, Li Yi's third stone bullet hit a cavalryman in the middle of the stormtroopering army.

"Senior brother, are you provoking them?

Jing Zizheng was a senior brother, and he immediately understood Li Yi's intentions. ”

Li Yi first hit the front, then the back, and finally the cavalry in the middle, which was completely telling the grassland tribe that the trebuchet of the Dayu Dynasty could do where to fight.

"This damn Dayu sheep is deliberately provoking us!"

The other centurion in the ranks looked angrily at the high walls and shouted at the cavalry behind him.

His words were like throwing a spark in an oil drum, and the steppe cavalry exploded in an instant.

"Centurion, let's rush, I'm going to rush to the city and cut off the head of the guy who fired the return cannon as soon as possible."

A steppe cavalryman brandished a long knife in his hand and roared angrily at the Great Wall.

The first centurion to be stoned to death just now was his own eldest brother, and the hatred of killing his brother is not shared.

"We have to calm down now, you also saw that the few plus return cannons on this wall are too much of a threat to us, now we must advance at a normal speed, we must open up a safe route for the army before the arrival of the army, otherwise when the siege equipment comes, it is very likely to be knocked out by these return guns."

The centurion was also relatively calm, and he knew very well what his main purpose was now.

He wasn't carried away by the anger either.

So the vanguard army is still moving forward little by little at its own pace.

And the reason why they were able to travel on the steppe full of thistles was entirely because their war horses sat on special treatments.

In fact, each horse of this cavalry vanguard was equipped with a thick steel plate under its four hooves.

It was nailed to the horse's shoe like a horseshoe, as if it had put a pair of steel shoes on a war horse.

Therefore, even if their horses step on the thistle, they will be fine.

And their task now is to choose a path back and forth in this area as soon as possible, and they want to let the war horses step on the thistle terrestris into the dirt as much as possible, so that the war horses behind will not be injured by the thistle.

As for the pesky tripwires, they can only be broken when the siege engines arrive in the rear due to their iron chains.

Fortunately, it is late autumn now, and the grass of the grassland has died, and the stumbling horses are very conspicuous on the grassland, and they only need to control the war horses to jump over.

However, even this greatly reduced the speed of their movements, and it was in this area where the tripping ropes were laid out that a large number of cavalry vanguard troops were killed every year by the return cannons on the city walls.

But as long as they controlled the horses fast enough, they were able to escape the area relatively safely.

After Li Yi stoned three cavalrymen to death just now, he stopped firing that trebuchet.

He asked the soldiers around him to pick out the stone bullets according to their requirements, and then he began to direct the soldiers to turn the winch of the trebuchet.

The soldiers had just seen him and easily killed three cavalrymen, and they couldn't help but believe that the rune that the young man had just drawn must have worked.

So they cooperated one after another and turned the winch according to Li Yi's request.

When all the winches were adjusted, he ordered all the trebuchets to eject the stone projectiles.

The sound of "Xiu Xiu" was endless, and the dense stone bullets were smashed in a row towards the cavalry.

"Speed up and charge me!"

The centurion in the ranks gave the order again.

He believes that as long as his speed is fast enough, even if the opponent can quickly adjust the landing point of the return gun, it will not help.

After all, they couldn't adjust faster than their own horses.

However, he still underestimated Li Yi's ability, and he didn't know that Li Yi's master had taught him something called advance measurement.

It stands to reason that the people of the steppe tribe will shoot the running prey in advance, but they have never thought that they can also shoot in advance when they shoot back the cannon.

After all, before Li Yi, all the return cannons were fixed points, and no one was bored to use them as bows and arrows.

Without Li Yi's precise calculations, it would be difficult to make this thing point and hit wherever it wants.

Accompanied by the whistling stone bullets, there was the wailing of war horses and the screams of cavalry.

This wave of trebuchet attacks hit the rearmost of these cavalry solidly.

Although Li Yi had already calculated the amount in advance, he never thought that when he commanded the soldiers to launch trebuchets, the other party's cavalry suddenly increased its speed.

If they had been a few points faster just now, it was likely that this wave of attacks would have failed.

Li Yi felt that his face was a little unbearable, and he almost overturned the car when he blew the bull just now.

However, the people around him all looked at Li Yi with monster-like eyes.

They were now completely frightened by Li Yi's miraculous means.

Who would have thought that he would be able to command the soldiers to adjust the steppe cavalry in the state of concentrated acceleration of the trebuchet without the other trebuchets being test-fired.

After carefully observing the speed of the steppe cavalry, Li Yi immediately commanded the soldiers to adjust the trebuchet again and then launch.

This time, the stone projectile landed precisely in the center of the steppe cavalry ranks.

These cavalrymen were once again smashed by the stone bullets flying from the sky, crying dad and shouting mother, because the middle war horse fell to the ground to block the war horse behind, the back war horse could not dodge, and many war horses were tripped and fell to the ground.

The cavalry on the horses were smashed, and many of the cavalry were injured by thistles.

However, the cavalry in front did not slow down, so they completely dragged on with the whole team, and the formation was completely destroyed at once.

"Damn, I don't have to fight now, the team is all scattered."

Li Yi looked at the chaotic cavalry and couldn't help but feel annoyed.

Although many steppe cavalry were reimbursed at this time, their formation was completely disrupted.

If the formation is chaotic, the probability of the trebuchet hitting the enemy will be greatly reduced, after all, the dense formation is the best target for the trebuchet.

But Li Yi didn't see that Jing Ziyi was already dancing happily at this time.

Li Yi didn't know what it meant that the two attacks just now completely broke up the grassland cavalry vanguard, but Jing Ziyi knew it very well.

This means that the tactics of the cavalry of the steppe tribe to destroy the thistle terrestris will be greatly limited, and there will be many difficulties for the steppe cavalry attacking later.

More importantly, the ability to accurately hit targets with trebuchets means that the same method can be used to destroy the opponent's siege engines in the future.

In the past, they usually used rockets to deal with these siege engines, but the results were basically ineffective.

After all, the siege equipment is big and heavy, and a rocket hitting it is basically like a mosquito biting an elephant.

But trebuchets are different, even small stone projectiles will be projected by the trebuchet with a huge amount of kinetic energy.

Those wooden siege equipment were basically scrapped when hit by stone bullets.

In this way, this will greatly increase the difficulty of the opponent's siege.

This allows them to attack the enemy from a high position.

"Xiao Yi, you are really my savior!"

Jing Ziyi patted Li Yi's shoulder excitedly, and his excitement was beyond words.

It's just that Li Yi suffered, and he felt that his shoulders were about to be swollen by Jing Ziyi.

Li Yi didn't expect the weak Senior Brother Zizheng to have such a burly brother.

And Jing Ziyi also successfully subverted Li Yi's inherent impression of Jun Sima.

Originally, in Li Yi's cognition, he always thought that Jun Sima, as a civilian in the army, should look like a weak scholar.

But Jing Ziyi is completely like a fierce general, and Li Yi believes that he is a pioneer in the army.

"It's really the same rice to raise a hundred kinds of people, and the senior brother and his brother feel that they are two extremes."

Li Yi thought to himself in his heart.

"Brother Ziyi, you are really tormenting the little brother, how can I afford such praise from you! You and the soldiers deserve the title of Savior of the Frontier. ”

Li Yi was embarrassed by Jing Ziyi's praise, in his opinion, he didn't actually do anything, just borrowed a trebuchet to kill some steppe cavalry.

"You don't want the student to be that stinky boy who puts the literati's set of empty things."

Jing Ziyi said to Li Yi with a smile.

Just as Li Yi and Jing Ziyi were complimenting each other, Qi Ning Qi Chao and some soldiers on the side were lying on the ground studying the mathematical formula that Li Yi had just written.

"Xiao Chao, it seems that these runes are really useful, this kid really seems to have two brushes, but I don't know which immortal he is communicating with this rune."

"Sister, I think it's definitely the god of war in the sky Erlang God who communicates."

Qi Chao said with an oath.

"Don't talk nonsense, I think, maybe clairvoyance, otherwise how could these stone bullets be so accurate as if they had eyes."

A soldier next to him said disapprerovingly.

"You don't understand, Erlang God has a third eye, which is not worse than clairvoyance!"

Qi Chao still insisted on his own point of view.

"Don't argue, no matter which god is communicating with, we should quickly write down this rune and draw it on paper to make a talisman, so that we can ensure that we will win all battles."

An elderly soldier lined up the crowd lying on the ground, carefully memorizing the mathematical formulas on the ground.

"Great idea!"

Everyone nodded, and began to memorize the formula on the ground in earnest.