How?

Not to mention general Fang, who knew nothing outside the city, was Xu Qing, who watched Chen Ze decorate with his own eyes. At this time, he was also confused.

He knows what Chen Ze did.

After running to the square to carve the coordinate axis for the catapult, Chen Ze called all the soldiers responsible for launching the catapult.

Chen Ze's so-called class is to teach these soldiers to know the coordinate axis engraved by him, and it took them an hour to carry out simulation practice until they can quickly type out the angle he reported.

A catapult needs 15 soldiers to operate, five to load ammunition and ten to pull rods. Chen Ze also worked hard to teach these 150 people to use the coordinate axis.

At that time, Xu Qing was listening. He understood Chen Ze's coordinate axis theory very quickly, but this did not completely solve his doubts.

Indeed, if he is familiar with the coordinates, he can improve the hit accuracy of the catapult. From this point, it really opened his eyes.

But the question is, can Chen Ze make the trestle fight further only by relying on different angles?

You know, Chen Zetan said just now that in theory, the elevation angle of 45 degrees is the farthest angle for throwing, but it is obviously impossible for the stone catapult in the square to use this angle, otherwise the fireball will directly hit its own wall.

High and far?

With such doubts, Xu Qing saw that after class, Chen Ze ordered someone to install an extra elastic rope on each stone throwing machine.

Using pull to increase range?

Seeing this operation, Xu Qing's eyes brightened and then darkened.

This is not difficult for him to understand. It is the same as the strong bow used by the archer. The stronger the pull, the farther the arrow will be shot, and the greater the power will be.

But the power required will also increase.

If an elastic rope needs ten people to pull it with all their strength, add another one, and the force required will be at least doubled!

More people?

Twenty people to pull the catapult?

Xu Qing shook his head. This method won't work.

Although the catapult is not small, the space behind it can accommodate ten people standing at the same time. The pull rod is the limit. If you add twice as many people

These extra people can only stand on the side to pull. There will be problems in the direction of the force. The force can not be used in one direction. I don't know whether it can double the force, but what Xu Qing knows is that it will have an impact on the ejection angle.

If one can't get it right, he is likely to make a stupid thing such as shells directly hitting his own wall, which makes his relatives hurt and enemies happy.

You can't pull from the side. You can't let someone hold the waist of the soldier in front to help pull, can you?

It's not pulling carrots.

The soldiers in front could not bear the force of the double elastic rope at all. Either they could not pull in place, or their hands were broken, and they could not complete the task.

Although there was a lot of doubt, Xu Qing didn't rush to publish his suggestions as he had done several times before. Instead, he wanted to wait for Chen Ze to do another operation that would brighten his eyes, so that the doubt in his heart would suddenly open up.

However, No.

After waiting for a long time, he saw that Chen Ze went back to the city tower after checking that all the catapults were equipped with elastic cables as required, regardless of his eager eyes.

Xu Qing, who was only confused, and the same stone throwing machine soldier who shrugged and stood puzzled.

Explain?

How to explain?

How to let the soldiers pull the double elastic rope has involved the core secret of Chen Ze, which is easy to be ignored.

After returning to the city tower, the archer just fired a rocket and lit the last fire wall. In the light of the fire, Chen Ze saw the poisonous fog army assembled behind the fire wall and ready to attack the city at any time.

The time is just right.

He smiled. In his mind, including the wuanguo generals recovered from Guo Zi, all the three generals he owned were restored to usable state, which means

The time has come!

"Lord!"

Li Quan'an, who has been with him, changed his look and respectfully saluted Chen Ze.

"You should know what I'm going to do?"

Chen Ze said faintly that at the same time when Jiang Xing was available, he had put Cheng Yu's Jiang Xing into Li Quan'an's body. At this time, Li Quan'an was Cheng Yu, a famous Minister of Cao Wei!

"Yes!"

Li Quan'an bowed.

While he responded, Cheng Yu also used his first martial arts skills.

General skill: ambush!

You can lead soldiers with the limit of command to ambush. Within a mile of the ambush, the ambush combat power will double!

Cheng Yu's martial arts skill is a cheating skill when he uses it to defend the city. All the defenders can be counted as his ambush!

It's just that Cheng Yu's controllable soldiers are long-range arms, and close combat soldiers can't enjoy this bonus.

However, there are naturally no close combat arms available.

The so-called long-range, archers, catapults also count!

Of course, this doubling of combat power does not mean the catapult, but the soldiers who control the catapult!

Under the influence of Cheng Yu's martial general skills, the 150 soldiers beside the catapult stand together. Suddenly, they feel that their whole body seems to be full of strength. They are at a loss. At the moment, they are ready to try.

The doubled combat power has brought more strength to the soldiers, and the crux that Xu Qing did not understand no longer exists. After Chen Ze reported the attack position, Xu Qing can't believe that the catapult that was originally estimated to take 20 soldiers to pull has been easily pulled to the scale that Chen Ze wants.

It's not just that simple.

After a round of volley, these soldiers were like machines with no fatigue and no emotion. They continued to open the next round with the most concise action, followed by the next round.

As long as Chen Ze reports the position, a round of ten fireballs will never stop. Xu Qing's eyelids jump wildly at the crazy scene.

The stronger the pull, the farther the ejection distance. After solving the power problem, the range of Chen Ze's catapult has been increased by at least half, which is enough to attack the poison fog army from the city!

As the commander of the urban defense force of Xiyun City, has he ever seen his soldiers so brave?

This is the strategy Chen Ze came up with to defeat the enemy!

In order to implement this plan, the catapult is the key. As for placing the catapult in the city, Chen Ze is not trying to make a mystery, but an indirect aiming method of artillery he accidentally saw in his previous life when reading the ancient war examples.

On the one hand, this method can be used to confuse the enemy. On the other hand, it can also solve the problem that there is not enough space in the city tower and more catapults can not be placed. When used at this time, the effect is remarkable.

Of course, if you want to succeed, both the catapult and Cheng Yu's ambush skills are indispensable, so this is the reason why Chen Ze wants to wait until midnight anyway.

The general trend is set!

When the last siege tower turned into coke under heavy artillery fire, the threat of the poisonous fog army to Xiyun city has been minimized.

Without the catapult, the siege tower, or even the siege hammer, do these six or seven thousand people who scream all the time still want to attack the city?

Whether we can get close to the wall is a problem.

Meng Yang led his group of swordsmen and spearmen. His brothers also came back at this time.

"Big brother!"

As soon as he got to the city, he shouted excitedly, "you guessed it, but I didn't kill enough!"

With a bloody head in his hand, he was waving a special dance to Chen Ze.

"Not fun enough?"

Chen Ze turned and smiled at him, "will those people outside the city make you happy?"