Under Sun Yu's orders, Tao Qian immediately sent people to find the best carpenters in Xuzhou City, as well as a large number of soldiers with excellent craftsmanship.

Sun Yu found the manufacturing drawings of ancient trebuchets in the database of NM01, although NM01 can also call up the manufacturing drawings of cannons and muskets, but these drawings are meaningless, and there are no technological conditions for these big killers in this era. Don't say anything rifling, triggers and the like, the quality of iron alone can't pass the test. You can only choose weapons that can be made with crude tools such as cow tendon, wood, and iron nails.

After a round of screening, Sun Yu chose the kind of counterweight trebuchet that the Mongols preferred to use, also known as the return cannon. This kind of trebuchet uses relatively little manpower and animal power, and can first use a winch to lift the heavy object, pull the mechanism, and accumulate throwing force. When the stone is placed on the scoop, the weight is released, and the large scoop is raised and the boulder is thrown.

The return cannon requires less personnel and space than the old trebuchet, and the throwing accuracy is much higher, but the materials required are not more advanced than the old stone trebuchet. It can be made with only wood, cow tendons, iron nails and other things, and it is the strongest long-range weapon that Sun Yu can think of in this era of the Three Kingdoms.

Sun Yu, who does not have the assistance of martial arts, can only find a breakthrough point from advanced machinery, which is also a helpless move. Sun Yu drew the drawings, and the craftsmen of Xuzhou City hurriedly cut down the trees in the city to make a return cannon.

Inside and outside the city, there is a carpentry competition like a competition, of course, it is the craftsmen in Xuzhou who are competing with Cao Jun outside, and Cao Jun knows nothing about the situation in the city.

10,000 people started carpentry, this scene was really quite violent, because Tao Qian was a benevolent lord, the people of Xuzhou City loved him very much. In addition, the people saw that the refugees who fled into Xuzhou a few days ago were dyed into colorful people by Cao Ying, and no one wanted the city to be dyed like that, so they all regarded Cao Ying as a big villain with the same hatred, and took the initiative to help Tao Qian do carpentry.

People in this era are much harder than later generations, and the furniture at home is usually repaired by themselves, so everyone knows some manual skills more or less. There were more than 100,000 residents in Xuzhou City, and suddenly the scene was violent, all the trees in the city were cut down, and all the ownerless empty houses were demolished by the people, and wood and stones were used to make trebuchets.

Sun Yu kept wandering in the "craftsman" group, drawing drawings, and found a large number of painters, helping to copy the drawings of the trebuchet and distribute them to the "craftsmen", the hot scene lasted until midnight, and the people lit oil lamps to step up the construction of trebuchets, which really moved Sun Yu to the point that he couldn't do it, even if the future generations volunteered to donate blood, there was no such a lively scene, it seems that the dyeing action of Mimi's eyes really angered the people of Xuzhou.

In the early morning of the next day, fifty counterweight trebuchets were miraculously built in Xuzhou City. Of course, many people are tired and lie down, fighting is not their business, and when they are tired, they go home to sleep, which does not affect the Xuzhou army to defend the city.

Sun Yu ordered the soldiers to push these trebuchets behind the houses on the edge of the western city, and hide them well, with the cover of the city walls and houses, they could not be seen from outside the city at all, even if Cao Jun outside the city stood on the well or the cloud tower, he could not see dozens of strange trebuchets hidden in the city.

After all this, Cao Ying also woke up.

The "boom" drum sounded, and Cao's army began a new day of siege operations. Today's battle of Cao Jun is not small, although there is no time to build hundreds of trebuchets, but Cao Jun still launched close to eighty, this number is not small. I don't know how many soldiers of the Cao Army were tired to be so efficient.

Mimiyan climbed onto the top of the high float canopy and ordered hundreds of soldiers to laugh in unison: "Old lady Tao Qian, Sun Xunzhen, you still haven't surrendered, do you want to wait for me to find you out?" Bomb the city walls of Xuzhou into slag today! ”

Sun Yu already had a plan in his heart at this time, how could he be afraid of her, but Sun Yu was not a person who liked to sensationalize, so he ignored Cao Ying's provocation, and did not ask the soldiers to scold him back.

After a while, Cao Jun's eighty trebuchets came to the land of two arrows outside Xuzhou City, the soldiers were busy, loading the ammunition, Liu Ye used the blue martial arts technique "Thunderbolt" as usual, stretched out his hand and pointed at the city wall of Xuzhou City, and more than 80 trebuchets immediately bombarded the place where she fingered.

The sky was full of stones, and dozens of kilograms of stones hit the city wall of Xuzhou City one by one, and the gray smoke flew all over the sky, and the stone chips were shooting everywhere. The ancient city of Xuzhou seemed to have been hit by a giant beast, and even the ground trembled. Fortunately, Xuzhou City is a famous ancient city, and the city is high and thick, otherwise it would not last long.

Seeing Cao Jun so powerful, the people in Xuzhou City were a little unconfident. Tao Qian said to Sun Yu: "General Sun, is it useful for you to build those 'return cannons' last night?" Cao Jun's thunderbolt is commanded by military generals. ”

This time, even Gongsun Yue was a little weak, she couldn't help dragging Sun Yu's arm and said: "Seek the truth, I haven't seen you play carpentry, can you deal with other people's martial arts skills?" It's really not good, let's open the north gate and escape! ”

Sun Yu made a reassuring gesture to the generals of Xuzhou and his own women, but a simple gesture obviously could not reassure them, Sun Yu was forced to be helpless, sighed and commanded nm01. I saw a flash of light blue light on Sun Yu's body, and two big light blue characters jumped out of the top of his head - "Thunderbolt", which was exactly the same as Liu Ye's, but the color was much lighter.

Sun Yu lied and said: "I will do Liu Ye's trick, don't worry." ”

Sweat! At this moment, everyone was taken aback by him: "Your Sun Xunzhen is really versatile, even a strange move like 'Thunderbolt'?" Then why don't you command the trebuchet to fire the stones? ”

Sun Yu stubbornly said: "My 'Thunderbolt' is a little different from Liu Ye's, she can directly command all the Thunderbolt cars, but I can only adjust and aim one by one...... Belch...... Anyway, mine is worse, but the victory is that the enemy doesn't know about it, and we can always plot against her once. ”

After saying that, Sun Yu took the fake thunderbolt, walked to a trebuchet, and asked NM01 to help calculate the wind direction, air resistance, and parabola...... Adjust a lot of data, so that this trebuchet is aimed at one of Cao Jun's stone generators. Then he called a soldier and ordered: "After a while, when I say fire, you pull down the mechanism of the launch." ”

After a little more hard turn, Sun Yu adjusted all the fifty trebuchets and aimed at Cao Jun's fifty trebuchets, and now everything was ready, just waiting for his launch order.

At this time, the west city wall has been damaged a lot under the continuous bombardment of Cao's army, and many bricks and stones on the city wall have been broken, and a large area of the city wall has become pitted, and the soldiers on the city wall have long been frightened to run into the city.

Sun Yu took advantage of the fact that Liu Ye's trebuchet was loading ammunition between shots, so he boldly walked up to the city wall and laughed loudly at Cao Jun outside the city: "Don't think that only you have 'Thunderbolt', so will I, Sun Yu!" ”

Cao Jun outside the city sneered, and the euphorbia Lolita Wei Hu roared: "Don't lie here, you deceived us many times in a row a few days ago, and we will never be fooled by you again." ”

"Oh, let's show you!" Sun Yu let out a long laugh, a blue light flashed on his body, and two huge "thunderbolts" jumped out of his head, which shocked Cao Jun outside the city.

Mimi Yan stood on the top of the canopy, looking at the words on Sun Yu's head curiously, she couldn't help it, and asked the soldiers to spread the word together: "Sun Xunzhen, I know you are full of tricks, but ...... If you want to use 'Thunderbolt', you have to have a Thunderbolt car first, but there are no cars, even if you have martial arts skills, what can you do? I'm not going to ask Liu Ye to teach you how to make a thunderbolt. ”

Sun Yu laughed loudly: "Who said I didn't have a thunderbolt?" Let's show you now! Launch! ”

"Launch!"

"Launch!"

Sun Yu's orders echoed into the city, and the heralds shouted one after another, "Fire!" ”

With the sound of this firing, the fifty trebuchets in Xuzhou made a "rattle" sound at the same time, and the soldiers pulled down the mechanism, and the fifty counterweight trebuchets raised their huge arms together and threw a large number of stones into the sky.

Ahem, although my "Thunderbolt" can't directly control trebuchets, but I have one soldier for each trebuchet, hum, this is called voice-activated martial arts, hahaha! Sun Yu felt a burst of pride in his heart.

Fifty huge stones streaked through the sky and smashed towards the trebuchet group commanded by Liu Ye!

"Not good!" Dian Wei, who had been standing beside Liu Ye as a guard, shouted, hugged Liu Ye to his shoulders with both hands, and ran away. I saw fifty boulders falling straight down, impartial, just smashed on Cao Jun's fifty thunderbolts.

The sound of "clang" continued to sound, although the name of the thunderbolt car is very popular, in fact, it is just a frame made of wood, and dozens of pounds of boulders falling from the sky were smashed lightly, and the thunderbolt was smashed into pieces. Seeing stone chips and broken wood chips flying everywhere in the field, the soldiers of Cao Jun, who were in charge of controlling the thunderbolt car, were startled and fell to the ground one after another, fearing that they would be injured by the broken stones and broken wood.

When the smoke and dust cleared, everyone took a closer look, Cao Jun's trebuchet array was already miserable, smashed by Sun Yu's trebuchet, and collapsed, and only about 30 of the 80 trebuchets remained, this is still because Sun Yu's trebuchet has a few crooked, otherwise the loss will be even greater.

Wow, the defenders of Xuzhou City burst into a huge cheer!

"Sun Xun is really mighty!"

"General Sun is the highest!"

"General Sun, God!"

"Seek the truth, I love you to death!" Gongsun Yue hugged Sun Yu and kissed him on the face.

"Sun Xunzhen! You big badass! On the roof of the car outside the west of Xuzhou City, Mimi's eyes jumped around angrily, and she stepped on the roof of the car out of a hole: "How many martial arts skills have you hidden and not used?" I'm going to get you caught and stripped naked...... And then...... Hum...... Thoroughly figure you out inside and out! ”

(To be continued)