The trebuchet built by Xu Huang had not yet begun to be built, and just setting up the lever in the middle caused Liu Zheng's doubts.

"Wait, Xu Huang, how are you going to build your trebuchet?"

Liu Zheng saw that Xu Huang's creation was not the same as what he thought, and he immediately had some doubts.

When Xu Huang saw Liu Zheng asking, he was not confused, but immediately explained to Liu Zheng.

After comparing the appearance of the trebuchet with his hand, and roughly describing his thoughts, Liu Zheng understood what Xu Huang meant.

However, after Liu Zheng understood what Xu Huang said, he did not stop Xu Huang, but changed his tone and said a word to Xu Huang.

"I see, Xu Huang, it's better to do this, in order to build a trebuchet as soon as possible, the two of us will lead some artificial trebuchets respectively, and try it when the time comes, who will build it better and have a greater attack power, how about it?"

As soon as Liu Zheng opened his mouth, Xu Huang was immediately interested, and immediately showed a smile.

"Haha, then lord, haven't I won, you haven't even seen a trebuchet, how can you build a trebuchet?"

"It's not necessarily, I have my way, do you dare to bet?"

"Yes, bet on what?"

"Well, just bet on the head of Fan Yi, the prince of Linyi Kingdom, I won, then the siege battle of Linyi Kingdom will be led by me to lead the army to charge, if you win, you will come, how about it!"

"Okay, everything is up to the lord!"

The trebuchet that Liu Zheng had in mind was an elastic trebuchet, which was not pulled by manpower, but by the principle of leverage, using heavy objects for projectile.

The specific operation, in fact, is very simple, is to make a huge crossbow arrow, the lever pulled by the bowstring is the central axis of the trebuchet, the main lever is stuck, and the elastic force of the bowstring is used to bounce the lever back, and at the same time drive the ammunition at one end of the lever to fly out.

Such power is much greater than that of a simple human being.

The distance and power of the projectile have been multiplied, and when applied to siege battles, it can definitely increase the chances of breaking the city to these people under Liu Zheng's command.

After Liu Zheng made up his plan to build a trebuchet, he first drew a small sketch in his own camp, and then made it according to his own sketch.

Although he doesn't particularly understand carpentry, there is no big problem in making a simple crossbow bed trebuchet, this principle is in the high school physics knowledge of later generations, which is nothing more than the use of the principle of leverage, plus the principle of shooting with a bow and arrow.

Piece it together and do some simple makeovers.

For a day, Liu Zheng was making his own sketches, and then constantly perfecting them, using the triangular structure to reinforce and collect the materials he needed.

For three whole days, Liu Zheng was preparing for the preparatory work, but he had not yet fully started to act.

On the other side, Xu Huang has built three trebuchets in three days.

And after preliminary tests, the range of these trebuchets actually reached one hundred and fifty steps.

Although the distance of one hundred and fifty steps is not far, some powerful archers can also reach it with arrows, but the trebuchet projects a huge boulder with a weight of 100 catties, and the lethality is not comparable to that of arrows.

If the arrow is a single injury, then the trebuchet is a group injury, a hundred-pound boulder smashed on the city tower, if the city tower is not strong enough, it may be directly smashed through these boulders, and the city tower will collapse.

The trebuchet made by Xu Huang does not project far away, but the lethality is still okay, it can project a boulder of about 100 catties, reach the city tower, and can also form a certain amount of damage to the city tower.

On Liu Zheng's side, he didn't start production for three days, but just analyzed the production process one by one.

In three days, Liu Zheng became a researcher and began to gradually improve the crossbow bed trebuchet he designed, differentiating the process, and preferably, simplifying each step, so that everyone could directly participate.

Everyone goes to work on a piece and put it together to get there quickly.

On the fifth day, Xu Huang had already completed the manufacture of five trebuchets, the first day was spent cutting down trees and collecting materials, basically no production, and the next three days, every day at the speed of one trebuchet, and on the fifth day, he had even sped up and made two.

After completing five trebuchets, it was enough to deal with Xianglin City, he came to Liu Zheng's side and wanted to see the situation on Liu Zheng's side, but when he came to Liu Zheng's construction site, he was also stunned after seeing that Liu Zheng's construction site was empty.

"Lord, where's your trebuchet?"

Xu Huang glanced around the construction site, and when he didn't see any trebuchets except for some materials, he still had some doubts.

"Ah, Xu Huang, it's you who came, my trebuchet hasn't started yet."

"You haven't started to do it yet, my lord, you don't know what to do."

Xu Huang opened his eyes, and it had been five days. If it is not manufactured, there will be five days left, and Liu Zheng may not be able to come in time.

Moreover, Liu Zheng's idea is to break the Elephant Forest City within ten days, and now that five days have passed, there are only five days left for Liu Zheng at most.

"Don't worry, my trebuchet is very fast to make, it won't take a day to make it, and there will definitely be more than yours."

"Lord, I feel like you're tricking me, I don't believe it!"

"Hahaha, don't you believe it, then you just wait and see, there are still three days to go, and on the ninth day we will start attacking the city, and we can't delay it until the tenth day!"

In Liu Zheng's heart, he never thought of going to attack the city on the tenth day, if he waited for his trebuchet to be built, Liu Zheng decided when to start attacking the city.

Now, five days later, his preparations are almost done, the materials and parts have been made, and it is time to assemble.

If you assemble it, a day or two is enough.

On the sixth day, Liu Zheng once again stepped up the production of materials and tried to start assembling them himself.

After making sure that there was no problem, on the seventh day, he began to move the left and right materials together and assemble the trebuchet with all his might.

On the eighth day, the materials for a total of twenty trebuchets were assembled.

He was dragged outside Xianglin City by Liu Zheng and covered it with trees to prevent it from being exposed to the eyes of the defenders of Xianglin City.

And Xu Huang also pulled out his trebuchet, and when he saw Liu Zheng's twenty trebuchets, the whole person was stunned in place.

"This ...... How is this possible, three...... Twenty trebuchets were built in three days? ”