"Okay, Zhou Dajiang made great contributions this time!" Soon the battle was confirmed by the observers on the hot air balloon, stuffed it into the bamboo tube and slid down the cable, and came to Li You's hand. The catapult that Arubu worked hard to build lost more than half of the first wave of attacks, and the rest must have no time to escape the next attack by the Jiazhou army.

"Thank you for your praise. We are just following Your Majesty's orders. We really don't dare to take credit." In order to improve the enthusiasm of the craftsmen, Li You and Gu Jiangzi discussed a craftsman-level certification system, and gave different treatments, status and honors according to the craftsmen's level. Among them, the master craftsman is second only to the master craftsman. There is no other person in this level except Gu Jiangzi. In other words, Zhou Zhengxin is already one of the few craftsmen in the Jia Dynasty at a young age. As for becoming a master craftsman, it is only a matter of time.

"Since ancient times, the most difficult thing in siege battles was to investigate the arrangements and movements of the enemy in the city. However, with this object, the movements of the enemy in the city were completely visible. Our army could specifically find the enemy's flaws to launch an attack. It was really convenient!" Shi Huaiyi was a person who read history books, and of course he could see the importance of hot air balloons to war.

The subsequent development of the war was just as Shi Huaiyi expected. After destroying the Beilu's catapult, the Jiazhou army's catapult launched an attack on the most densely populated areas behind the city wall. The Beilu soldiers were severely injured for a while, and Arubu had to order them to stay away for a while to avoid greater damage.

The reduction in the defense of the city was just enough to provide the Jiazhou army under the city. Li You immediately responded. Zhou Bofu led the infantry siege to build a ladder, pushing the nest cart, tower cart and other siege equipment to attack the weakest section of the city wall. Cannons, muskets and crossbows also increased the suppression of this section of the city wall. The raindrop-like projectiles pressed the defenders at the city almost couldn't raise their heads. Seeing that Zhou Bofu's troops were about to reach the city, they had to raise their heads and fight back.

The war was getting more and more intense at this time, and the way of delivering messages on the hot air balloons was changed from throwing paper notes to flags. Several soldiers waved two small flags and quickly passed the movements at the city to the eyes of the Jiazhou army in the agreed method.

"The enemy is preparing to increase troops, with a position of 251, with a number of 1,000 people. The catapults are ready to carry out a cover attack!" A series of targeted orders were transmitted from the central army. A commander quickly passed these orders to the corresponding responsible persons, and then made targeted attacks on the enemy's reaction.

Before Zhou Bofu led his men to attack the trench, he did not encounter decent resistance. Chen Heng's engineering battalion had already been ready to cross the trench. Pieces of wooden boards were laid on the top of the trench. The infantry rushed over quickly without waiting for the wooden boards to be laid firmly. The engineering battalion was divided into two groups, one group stayed in place and quickly dug the gap in the trench, intending to completely drain the water in the moat; the other part pushed the cars with extremely high defense to the city wall.

The top is a slope-shaped wooden cart, made of hardwood wrapped in iron. The pressure on the top can remove the impact of the rolling stone, allowing the wooden car to last longer. Six or seven elite soldiers from the engineering battalion were working hard against the huge wall tiles on the city wall with all kinds of strange tools.

The sharp blade made of fine steel was stuffed into the gap between the wall tiles, and quickly scraped off the glutinous rice mortar that adhered to the city wall tiles, and soon turned the surroundings of one city tiles into a gap. Then another soldier stepped forward and stuffed several iron rods with curved forks at the front into the gap. The other soldiers held the end of the iron rod and pried it hard. The brick gradually loosened and was removed by them. Since the first piece had been done, the next one would be easier.

The engineers quickly cut off all the bricks in front of them, revealing the solid rammed earth wall behind them. The engineers had already figured out a series of solutions. The sharp pickaxe was hard on the city wall. After a few small holes were dug out, the soldiers holding steel drills behind them rushed forward, aiming the drill tip at the small holes and began to drill quickly.

The rammed earth that was harder than rock became as fragile as tofu in front of these steel drills. Large pieces of rammed earth kept falling, and these engineers quickly drilled several large holes deep into the inner wall at the bottom of the city wall.

"Okay, the size is almost enough, you can go back first! Please call the soldiers around you to hide away." The little engineer leader drove his comrades out one by one, and he and his deputy stuffed a huge gunpowder bag into the deep hole, connected the lead and quickly ignited it.

A hissing spark came out of the lead and quickly moved towards the gunpowder bag. The two of them fled quickly as if they were burned by fire. They used all their strength to escape backwards. While escaping, they also called on the Jiazhou army landing behind to speed up.

In the distance, the musketeers on the nest car also increased the frequency of shooting in order to suppress the northern barbarians on the city wall so as to protect these people from leaving the safety zone as soon as possible.

"Lying down!" The ignited leader ran and counted in his heart. When he felt that it was almost the same, he pounced on the ground, and he also shouted to the friendly forces.

"Boom!" As soon as these soldiers lay on the ground, they saw a huge roar burst out from the bottom of the city wall, and countless broken bricks and hard soil burst out from all directions with the flames. The Beilu defenders above felt the city wall shaking and fell to the ground one after another.

Longcheng is worthy of being a strong city in the world. Even the explosion penetrated deep into the city wall did not directly blow up this section of the city wall. Instead, a huge hole was blown up under the city wall. Through this hole, you can see the city vaguely.

Such explosions kept ringing under the city wall. When the Jiazhou army's offensive stopped today and slowly retreated, at least ten such holes appeared on the base of Longcheng's wall. The surroundings of these holes were full of huge cracks, and the cracks extended to the surroundings, making Arubu and others feel shocking.

The tense war was temporarily over, but Arubu couldn't let it go. He could see that the Jiazhou army's attack today was only tentative and did not use all its strength at all. Even so, they felt gradually lost. Looking at the holes and cracks left by the terrible explosion, Arubu felt vaguely that this Dragon City seemed not as indestructible as he imagined.
Chapter completed!