Although the range of the thunderbolt was short, it was not small, and four ballistaks fired a salvo of twelve lit thunderbolts, following the direction of the drums. After a rumbling explosion, the neat and crisp drum sound disappeared, but the Yuan soldiers counterattacked with it.

The archers who had already boarded the carriage one after another, although they could not see the people on the city head clearly, but they could still judge the vague direction, and wave after wave of bows and arrows shot at the defenders at the city head.

"Bang bang! Bang Bang Bang! ”

The defenders at the head of the city held up a wooden shield like a huge sun umbrella, and the arrows thrown over fell like raindrops, and the roots stood upright as if filling the wooden shield with some hair, without hurting the Song army under the wooden shield at all.

Gun emplacements, crossbow beds, arrow stomping, ammunition depots and other places, wherever there are soldiers gathered and haunted, there is such a simple layer of wooden shields to guard, not only to protect the people inside, but also to become an automatic collector of arrows, a bit of Zhuge Liang grass boat borrowing arrows.

This is Zhao Tianyou's idea, the range of the Mongolian longbow is generally about 100 paces of lethality, and the building car is indeed a cut higher than the city wall, which is convenient for the archers above to find the target and aim, and can also rely on the height to increase the range and damage. But there is a problem that he can't avoid, that is, the angle of shooting is from top to bottom, and the strength of the bow and arrow is too poor when shooting flat, and he may not even be able to shoot at the head of the city.

"Thunderbolt! Aim for a 100-step building position! Put! ”

Say it's the aiming position, how to aim if you can't see it? It can only be a vague general direction, and people on both sides can't see each other anyway. The Yuan soldiers and archers on the building car kept pouring arrows at the Song army on the city wall, only the sound of crackling could be heard, and the specific killing effect could not be confirmed, but they had to keep shooting before the military order was changed.

The strong man with a leather shield bowed his head in a line, was pushing the huge catapults forward, and at the site of the attack there were eighty catapults, and behind him countless wagons pulling stones.

The catapult technique used by the Yuan soldiers was learned from the Persians during the Western Expedition, and the original name was Hui Cannon, which was actually a counterweight trebuchet, relying on the kinetic energy of the counterweight to shoot out the stones at the end of the lever.

The catapult used by Bijin Country is more scientific in design, and the ratio of counterweight and lever is well documented. These catapults built by the Yuan soldiers outside the city of Guangzhou weighed about three tons, required a dozen strong men to use, and had a range of about 80 to 12 paces.

This is a problem, the range of the Song army's bow and arrow at the head of the city is covered, which happens to be this distance. All of them had the building carts to suppress and cover with fire from above, and the catapults to attack from below, and they fought in close proximity, sometimes even a little further forward.

The strong men who worked by the catapults carried a leather shield behind them, and their bodies were always bent and bowed, using the shield on their backs to protect themselves from the arrows that fell from the city.

"Boom!"

"Oh mom!"

"Help!"

A tall building car was hit twice by a thunderbolt in the middle, and after two rounds of six-shot thunderbolts, it could no longer stand, and it fell apart with a bang, smashing more than eighty archers on the top platform to the ground. More than half of them died on the spot, even if they didn't die, they also broke their bones and tendons, and screamed again and again, no matter who they knew was good at kung fu, they were squeezed into a pile by a pile of thick logs, and they had to peel off two layers of skin if they didn't die.

"Boom! Gollum ......"

The catapult finally fired the first shot, and the eighty-pound boulder failed to cross the city wall, and smashed heavily on a place about two feet high, shattering several heavy city wall bricks, and then rolled down with a gurgling and fell into the moat.

The first step for the catapult was to fill in the moat, then get as close as possible and throw boulders into the city, smashing the houses on the ground. The most important thing is to deter the mind and discourage the fighting spirit of the soldiers, and the same as the long-range attack ability of the Hongyi cannon, the soldiers cannot see the cannon fire, nor do they know where it will fall and explode.

The same is true of catapults, one or two hundred-pound boulders may fly in at any time outside the city, who doesn't worry about hitting their heads? From the very beginning, the psychological effects on the soldier began when the big stone was thrown.

"General Zhao, the catapult is approaching! What to do? The archers couldn't see the direction...... "Before the words of the leader of the city defense army fell, the sound of boulders flying out of the city continued to sound, and this time the range did not hit the city wall, but fell into the moat with a bang.

The Yuan soldiers attacked because of the fog, hoping that this would happen right now. The defenders could not see the soldiers below, and there were many catapults, and once they were activated, they kept throwing boulders at one position and filling the moat, and then they had to smash through the walls and enter the city through the gap here.

Eighty catapults were launched, and many catapults, which were so powerful and earth-shattering that they did not have enough range, found that they could not shoot into the moat, so they could only continue to move forward. The Great Song defenders at the head of the city have begun to shoot arrows like rain in the sky, since they can't see the target, it's all based on their own feelings, and they don't need to aim and shoot hard.

"Bow your arm and shoot a rocket at the middle of the cart! It can ignite in mid-air and destroy buildings and cars as target guidance for the Thunderbolt. "Zhao Tianyou is not panicking, the Yuan soldiers are close to the city wall, and it is okay to even open a hole. Because there are also close-range lethal weapons thunder, cheap and equipped with a large number, the killing effect in the crowd is excellent, and you can throw enough at the Yuan soldiers under the city.

"Boom!" With a loud bang, the defenders of the city began to suffer casualties, and a 100-pound boulder was thrown onto the city by a catapult that had already approached, and two soldiers were killed after penetrating the wooden shield.

"Whoosh!" The Divine Arm Bow shot out a rocket like a firefly, and the sparks of the arrow shaft flashed and flickered, and it was difficult to see clearly in the fog, until it hit the target, the gunpowder it carried began to burn, and the Song army on the city wall could see the light in a trance.

"Thunderbolt fifteen to the left, salvo."

Others couldn't see it clearly, but Zhao Tianyou was already able to determine the location of the building car, and immediately commanded the thunderbolt artillery to bombard the target.

After the rumbling explosion, another tall building car crashed to the ground, still dead and wounded, and the sudden rockets inserted in the wood of the building car did not live up to their mission of starting the fire, and soon the building car caught fire.

The intense temperature dispelled the nearby fog, and the Yuan soldiers who were carrying stones were all exposed to the eyes of the defenders at the head of the city, and the Song army in the city suddenly shouted happily.

"Haha, I finally saw it, I'll shoot you and tell you to throw stones."

"Thunderbolts, aim at the trebuchets under the city, shoot and shoot until they blow up!"