Nan Ye didn't know that Li Ru in the city had prepared a big gift for himself. His ability can detect the deployment of personnel in the city, but he cannot detect blade weapons, except for those that are treasures.

It is even more impossible for Liu Bei and Sun Quan to know Li Ru's hole cards, and the soldiers under their command don't even know that this is just a feint. The three soldiers held their shields high, pushed the carts and ladders, and approached the city wall with firm steps. They were not fast, but carefully concealed themselves behind their shields. The soldiers understood that without siege equipment, they could not do anything even if they rushed to the city. Rushing fast is just dying fast, only when these big guys get to the city, they need to hurry up and get to the city.

The rows of siege weapons were still an arrow away, so Li Ru ordered: "Prepare the thunderbolt!" ”

That's right, Li Ru's secret weapon is the thunderbolt. In the Battle of Guandu, Nan Ye dedicated the drawings of a generation of thunderbolts to Cao Cao to break Yuan Shao's well, and from then on Cao Cao realized that thunderbolts were a good thing. However, Cao Cao later found that the first generation of thunderbolt vehicles was complex to manufacture, the operation was equally complicated, and there were shortcomings such as being unable to move, not easy to change the aiming direction, etc., and the lethality of the soldiers was also very limited.

After Li Ru saw the drawings of the Thunderbolt Car, he also discovered the shortcomings of the first generation of Thunderbolt Cars, but the advantages of the Thunderbolt Cars are also obvious, that is, they can perfectly fight against all kinds of siege equipment that are slow to act. So Li Ru built a batch of thunderbolt cars and placed them in Xuchang City. Only a big city like Xuchang, with a wide wall, can place a huge generation of thunderbolts.

Soon the Cao soldiers at the head of the city had the thunderbolt cart ready, and the rocks were also put into the leather pocket of the thunderbolt cart as ammunition. Li Ru squinted at the various siege equipment from far to near, waiting for these big guys to enter the range of the thunderbolt car.

Nan Ye, Liu Bei, and Sun Quan didn't pay attention, and there was a piece of red soil outside Xuchang City that was particularly conspicuous. The distribution of these laterite clay is exactly a line parallel to the city wall, and there are such laterite lines outside the four city walls, like a red square enclosing Xuchang City, which is obviously a man-made masterpiece.

The role of this red clay line was not clear even to the Cao soldiers in the city, and only Li Ru knew that this cordon represented the effective range of the Thunderbolt. Since the first generation of thunderbolts was not easy to aim, Li Ru simply used this stupid method to find out the landing point of the thunderbolt car's stone-throwing first, and then waited for the enemy to enter the firing range.

Just because it's stupid doesn't mean it's ineffective. On the contrary, some stupid methods are more effective than clever methods, at least Nan Ye's new thunderbolt may not be able to hit this red line accurately when it is an arrow away, and Li Ru only needs to order the soldiers to fire with all their strength and increase the range of the thunderbolt to the maximum, and he can almost perfectly hit this red clay line.

When Li Ru saw Nan Ye's soldiers pushing the cart and the ladder in a row and stepping into the red clay area, he only said one word: "Put!" ”

"Whoosh~Whoosh~" The sound of the boulder breaking through the sky is still far from the thunder and thunder, but the boulder flying in the sky is more terrifying than the thunder and lightning in the rainstorm. Although the celestial power of thunder and lightning is awe-inspiring, the probability of hitting a person is only one in a million, and the hit rate of these boulders is obviously much higher.

"Disperse! Lie down! Back off! Zhao Yun, Huang Zhong and others, who commanded the soldiers at the front of the battle formation, shouted the order together. In fact, before they gave the order, the Jiaozhou army had already reacted, and the catapult was no stranger to them, and the evasive action was also in the training program.

"Boom~Boom~" The stone smashed on the car with a loud sound, and the car made of thick wood and hardwood suddenly fell apart under the bombardment of the boulder. It was only at this time that the power of the thunderbolt was revealed, and the loud noise and destructive power were indeed not inferior to the Nine Heavens Tribulation Thunder.

Not all boulders can hit the rush car or ladder, and many more fall on the red earth to stir up a cloud of dust, or fall into the crowd and throw a splash of blood. No matter how effective the evasive action formulated by Nan Ye was, it was impossible for all the dense soldiers to dodge the sudden boulders. No matter how good the armor of the Jiaozhou army is, it is not enough to defend against the stones thrown by the thunderbolts.

"Mingjin retreats! All siege engines abandoned! Nan Ye looked at the Jiaozhou soldiers who died tragically under the boulders, and his heart was like a drop of blood. In fact, Nan Ye had already prepared for dealing with Cao Jun's thunderbolt, or he wouldn't have let the soldiers train to avoid actions, but when the thunderbolt really appeared in Cao Jun's camp, Nan Ye still felt unspeakably uncomfortable in his heart. This kind of feeling of lifting a stone and smashing oneself is really bad, which is the reason why Nan Ye has not studied gunpowder technology in Jiaozhou.

Nan Ye's soldiers valued the lives of their soldiers more important than the siege equipment, and gave up the equipment and attack at the first time, which made Li Ru at the head of the city very admired and very happy. Because Li Ru's target was not the soldiers, but the siege equipment. For Li Ru, using a thunderbolt to fight the state soldiers is like a cannon hitting mosquitoes, even if it hits, it will not be worth the loss. Destroying the siege equipment makes it impossible for Nan Ye to attack the city, which is the most important thing.

There was a very strange scene outside the south gate of Xuchang City, the boulders kept falling from the sky, and the siege equipment parked on the red earth was smashed one by one, but the Jiaozhou army no longer suffered casualties, and all retreated to the range of the thunderbolt car, looking at the boulders flying in the sky with great interest, and whispering from time to time.

"Hehe~ Use a thunderbolt to deal with me and others, Cao Jiang in the city is not crazy, right?" A soldier said to the robe next to him.

"It's not crazy, it's stupid! The thunderbolt cars made by the national teacher are much more powerful than those in the city. The Jiaozhou soldier next to him responded.

"Why didn't you say the national teacher used the thunderbolt first?" The previous sergeant asked.

"I'm afraid the national teacher doesn't think it's necessary. Didn't we win a big battle the day before yesterday! But it's hard to say next, I think the Cao army at the head of the city is going to be unlucky. The soldier smiled evilly as he spoke, as if he had seen the scene of Nan Ye's thunderbolt attacking the city.

"Look! That's not Tian Biao! The kid is still alive. As he spoke, the soldier suddenly pointed toward the center of the battlefield. I saw a young soldier crawling on the battlefield full of rocks.

I don't know if it was lucky or unlucky, the boulder thrown by the thunderbolt broke Tian Biao's feet, but it didn't kill him. Generally speaking, there is only one chance of being hit by a boulder thrown by a thunderbolt, and that is death. Being injured and not dying can be said to be a kind of luck, but everyone can see that Tian Biao's good luck is coming to an end. No one knew if the boulders would fall on his head the next moment, but even if he was lucky enough to dodge all the boulders, the blood on his body would be dried when he climbed back into the formation.