The walls of Huangzhou Mansion were built in the early years of the Ming Dynasty and are very strong.

However, due to the long age of the construction of the city wall, there are many problems in maintenance, and the small problems of brick and leakage abound, and the Qing army entered the customs with reckless troops and attacked everywhere, so it was natural to take care of rebuilding the city wall.

The two half-cut boats stopped at the bottom of the castle tower and began to dig the city wall at the location where the shells hit, and after removing the crumbling wall bricks on the surface, the rammed earth inside was eroded by the rain for many years, and it was relatively easy to dig.

However, with the increase of depth, the excavation gradually became difficult, this kind of city wall soil embryo is repeatedly tamped with cooked soil, and after more than two hundred years of natural extrusion, the soil has become extremely compact, as hard as masonry, a pickaxe down, can only dig a small pit in the wall.

The speed in the cave of the city gate is faster, but it is only relatively speaking, and the excavation speed is still an order of magnitude, which belongs to the difference between a snail and a turtle. Like the problem encountered by the half-cut boat, the more the Chu soldiers dug in, the more difficult it became, and the twister instructed everyone to carry out a second blasting, and then slowly transformed the structure of the cave with a pickaxe, and was busy until the second half of the night, and finally installed the two coffins filled with gunpowder in place......

The Qing army on the tower of the city had already discovered that something was wrong.

So far, only some small blasting has been carried out, and the vibration caused by the city wall is not large, but the Qing army is more or less aware of it, even if they don't know what the Chu army is doing, but so many Chu soldiers are busy under the city tower like ants, it is definitely not a good thing.

The soldiers of the Qing army reported it, and Sun Bo'an, Niu Yan, Xu Bin and others came to check it in person.

The city tower was under the focus of the Chu army's artillery, and the archers and firecrackers were always vigilant, beating the Qing army so that they couldn't raise their heads, and the interference to the city was very limited. The tremor was clearly felt on the castle tower.

Niu Yan was taken aback, but he was confused, so he had to ask Xu Bin and Sun Baian for advice.

"Two Xietai lords, what are Nanban doing?"

"Hmph, what else can you do? Dig the root of the wall! Xu Bin sneered and said disdainfully: "Nanban is whimsical, not only digging the roots of the wall, but also using gunpowder. ”

Niu Yan was very worried: "What should I do then?" If Nanban is allowed to dig like this, won't the city tower be able to be saved? ”

"Don't worry about Niufutai!" Xu Bin was very helpless about this military layman, and patiently pointed out: "The city wall of Huangzhou is more than three zhang thick. Even if Nanban uses the strength to eat milk, how many feet can he dig in a day? Before they could dig down the tower, the imperial army would turn around and wipe out this group of southerners......"

If you want to dig up the castle tower, you only need to hollow out a small half of the city wall underneath. But this is not an easy thing to do, even if the Chu army does not stop day and night. At least four or five days.

Blowing up the city walls with gunpowder is even more unreliable. Li Zicheng used gunpowder when he opened the seal, and he didn't blow up the city wall, but he killed a lot of his own people, and the battle of Huanggang was at a critical moment, and the Chu army wasted time and energy in vain, which was undoubtedly a very stupid act.

Wang Kefan is nothing more than that. Xu Bin felt very unlucky.

If it weren't for that Ali Hachao Ha Zhangjing who rashly went out of the city to fight, how could he lose Xianning County lightly? What is hateful is that Ali Hachao Ha Zhangjing was killed for his crime, but he made Xu Bin miserable. Not only did he become a defeated general waiting for punishment, but his soldiers also became cannon fodder for the Chu army, and thousands of people died under Huanggang City in the past two days.

Hateful! Annoying! Xu Bin's love was a little excited, and he gushed endlessly at Niu Yan, regardless of whether the other party could understand it or not.

However, Sun Bai'an thought for a long time, but suddenly interrupted him.

"Niufutai, has the gate of Wengcheng been blocked?"

"It's almost, two layers of stones have been blocked behind the city gate, and one is reinforced with a sack, even if Nanban pushes the cannon in front of him, he will definitely not be able to open it!" Niu Yan was very proud, the amount of work to block the city gate was very large, and it only took him half a night to do this, and Sun Bai'an would definitely praise it.

Sun Bai'an's reaction was unexpected: "In this case, don't block the sack, and remove a layer of stones from the front and move it to the side for later use." ”

After he finished speaking, he turned around and left, now that the fighting was fierce, there was no time to chat.

Niu Yan was dumbfounded, glanced at Xu Bin, and saw that he was also full of confusion, and hurriedly caught up with Sun Bai'an, and asked, "General Sun, what does this mean?" ”

"If something goes wrong, it's a demon, Nanban behaves weirdly, and I have to guard against it, so I have to bother the prefect of the cow."

After the city gate and jack gate were destroyed, Sun Bai'an dispatched troops and built a second line of defense in Wengcheng, but he did not intend to give up the city tower lightly, the city tower is easy to defend and difficult to attack, even if it cannot be held in the end, it must be stubbornly blocked, so that the Chu army will pay a heavy price and delay the opponent's attack.

However, the Chu army did not directly attack, but dug the city wall in no hurry, but it was beyond his expectations, could it be said that Wang Kefan still had any killer features?

Sun Bai'an couldn't understand what the Chu army was doing, but he had been on the battlefield for a long time and had rich experience, so he was extra careful when he encountered something he couldn't understand......

There was a sound of bangzi beating the watch, it was almost the fourth watch, and there was a battle on the city wall

At this time, it was almost the fourth watch, the battle on the city wall had just come to an end, the Qing army repelled an attack by the Ming army, but its own casualties were also very large, the strength of the Ming army was overwhelmingly superior, from day to night it had been two shifts to rest, but the Qing army was tired of coping, all the soldiers were turning in a row, and the body fell very quickly, very tired.

Sun Bo'an, Xu Bin and Niu Yan left the city tower together, and went down to the city from the horse road behind the city wall, although the situation on the side of the city tower was a little strange, the pressure on other places was greater, and the Ming army was willing to dig the city wall in vain, so let them toss.

"Niufutai, there is not enough manpower on the city wall, can you recruit another five hundred young people?" Sun Bai'an asked as he walked.

"I'll do my best for this ......." The potential of Huanggang City was almost exhausted, and it was not easy to recruit another five hundred young people, but Niu Yan did not shirk it.

Sun Bai was moved with peace of mind, and saluted with his fists: "Then it's ...... bothering."

He was just halfway through his speech when there was a loud bang behind him, and the earth shook!

A few people were still stunned, and the huge explosion sounded again, four times in succession, Niu Yan was frightened to the point of being earthy, but Xu Bin was still calming down.

"Ha, Nanban really invested in using so much gunpowder and setting off firecrackers for us to hear......" He was about to say two witty words, but the sturdy city tower suddenly shook, and under the incredulous gaze of everyone, it collapsed inexorably to the side, raising a cloud of dust. (To be continued......)