Lu Su shouted loudly: "Let them in, use the urn city to fight the enemy!" ”

As a result, the Jinling army gave up the defense of the periphery and let Liu Xun's soldiers attack the gate of Xicheng vigorously.

After a short time, I heard the ground below Xicheng seem to shake suddenly, and many soldiers almost felt like they were about to fall to the ground.

Immediately afterward, a voice like a tsunami was heard from the mountains: "The city is broken!" The city is broken! ”

And Cao Jun had already rushed into the city frantically, and the outer city of the west gate of Qufu City was finally knocked open.

"Kill!" Cao Jun braved the fire that he had just set in front of the city gate and rushed into the urn city.

"Death as much as you come!" Lu Su said coldly.

Countless Cao Jun took the opportunity to rush into the urn city.

"Shoot the arrow, release the arrow! Shoot them! The Jinling army was yelling.

"Hold on! Resist! Take the inner city gates, and they're done! ”

The storm of cold ice vessels shuttles back and forth in the urn city, frantically harvesting human lives. But at this point, no one cares about it.

For the two sides, since the urn city has been broken, there is no room for this war to turn around.

It's either life or death.

But compared to Liu Xun and the others, Lu Su took a much higher risk than them.

Because his ambush on the inner tower of the urn city at the moment is not so sufficient, and after the Jinling soldiers he can command completely dominate the city, the inner gate may have been knocked open by Liu Xu's soldiers and horses.

Once the gates of the inner city were broken, there was no doubt that the rear of the potters would be in the deepest crisis.

As the battle in the urn city became more and more intense, a loud bang was suddenly heard, and the gate of the inner city was also smashed open by Cao Bing.

"The city is broken!"

Cao's soldiers rushed into the city like crazy.

Faintly, it seems that Liu Xun can still be heard laughing: "Just Wengcheng, what can you do to me!" The city that someone Liu wants to break is not yet unbreakable! ”

"The gates are lost! Qufu is broken! The pottery thief is quickly killed! ”

Cao Jun's soldiers were shouting, their voices beating in the air like ignited oil, burning people's hearts.

Lu Su was not in a hurry, he just quietly looked at the crazy Cao soldiers in the urn city, and suddenly said: "Order Zhang Xiu and Zhang Xun to seize the city gate and put a thousand jin gates!" ”

In the distance, the potter, who was in charge of commanding the main battlefield, also seemed to hear that something was wrong at the West City Gate.

He sighed and said helplessly: "Finally, are you going to release my jack gate?" Unfortunately, I was hoping to catch a big fish with this thing. ”

The design of the jack gate was studied as early as a few years ago according to the proposal of the potter.

However, there are many material principles for the design of the jack gate, and the production cost is higher, and a large number of iron tools are required, even if the Jinling City with Jinling iron ore is not allowed to promote too much in a large area, and it is only in the potter's opinion that several key cities are used for construction.

And the jack gate of the inner and outer two gates of Qufu, the gate is iron-clad solid wood, it is covered with iron nails for reinforcement, the gate is 6 meters wide, 6.5 meters high, the thickness is up to 9 centimeters, the mass calculation is about more than 1000 kilograms, when the gate is opened, the gate rises to the gate hole above the inner gate groove of the city platform; When the gate is closed, the gate falls smoothly from the sluice groove, forming an "unbreakable" barrier.

As long as this thing is properly used once, it can trap those unprepared Cao soldiers in the urn city.

"Put!" Lu Su scolded loudly.

The technical requirements for driving the jack gate are relatively complex, which is also the reason why Jinling City has used the jack gate for practical purposes after years of research and adjustment.

The jack gate is controlled by a winch column, and each winch column will have two winch sockets about 1 meter from the ground on the first floor, which is the axis of the cross winch.

The top of the sluice groove is located 2.8 meters due south of the two winches, and the sluice trough is 6.2 meters long. There is a support stone between the two winches leading to the sluice groove due south, and the front end of the support stone also has a pulley fixing groove.

There is a positioning plate fixing groove and a rope sliding control structure fixing groove on the support stone, the rope of this pair of grooves mainly controls the jack gate, lifts and lowers to the pulley of the front end of the "support stone" from the gate groove, and is connected with the winch column by the positioning plate "notch" and other devices on the "support stone", and the winch is rotated manually to exert force, and the lifting of the jack gate is carried out.

Contrary to what the potter had originally envisioned, the jack gate was not smashed down at once.

Because although this kind of thing is heavy, it is most afraid of deviation, as long as it is slightly biased, it will be stuck, and it will not go up and down, which is very troublesome.

Therefore, in order to gain time, Lu Su asked Tao Ji to set up a formation in the urn city, and on the other hand, he sent two generals, Zhang Xiu and Zhang Xun, who had been arranged in advance, to defend the gates of the inner city in the outer city and occupy a favorable position, so that the jack gate could land slowly.

The gate of the inner city, led by Zhang Xiu in personal foot, guarded the city gate, and kept poking with spears, desperately resisting, not letting the other party boast of a step beyond Lei Chi.

The outer city was more troublesome, because there were no soldiers who could go down to fight on foot, so they could only defend themselves with arrows at the head of the city. The soldiers outside the city were shot with bows and crossbows, so that they did not enter the city in large numbers, while the soldiers of the Cao army in the city focused on the inner gate and did not pay much attention to the outer city gate, which to a certain extent, relieved a certain amount of pressure.

Although the jack gate is falling little by little, but it is not slow, when it is young, I heard the two loud noises of "boom" and "boom", and the jack gate finally landed slowly.

The soldiers and soldiers of Cao in the urn city were crazy.

"What is this?"

"Rush away! Burst the door open! ”

"No! Didn't move at all, it was too heavy! ”

"What the hell is this?"

Liu Xun also rushed into the city with the soldiers at this moment, he looked around to see the situation, and saw that the front and back doors were blocked, and he couldn't help but feel a little chill in his heart.

"What's going on? Hurry back, hurry back! ”

Just as Liu Xun was roaring loudly, a voice suddenly came from the city tower behind: "Liu Xun dog thief, I didn't expect you to have today?" ”

Liu Xun hurriedly looked up, but saw that the person who spoke was Zhang Xun, a general of the Jinling Army and his colleague in the past.

"You, is that you?" Liu Xun's face turned white in an instant.

Zhang Xun sneered and said, "That's right, it's me, I didn't expect it, right?" Liu Xun dog thief, back then, you betrayed the lord and colluded with Cao thief, so that the general's father and son died with hatred, but you went to your old friend to seek wealth and wealth, and now you should have revenge! ”

Liu Xun looked at the city like an iron bucket around, and fear suddenly rose in his heart.

"Zhang, Zhang Gong! For the sake of our former colleagues for many years, you, you can let me live! I will return this great kindness to you a hundredfold, a thousandfold in the future! I surrendered to Cao Sikong back then, and I was forced to do so! ”

"As a last resort?" Zhang Xun sneered and said, "Even if yours is true, I am not the only one who wants your life here!" Can you move them all? ”