There was something new in Guanghaiwei. First, the Acropolis was captured by a group of Japanese pirates, and then the Japanese pirates went out of the city to fight several battles to repel the flag troops rushing to rescue them.

The people around were still waiting to see the two flag troops under the city to pacify the enemy. They heard that the flag troops were riding horses and spreading around to find out where there were mine kilns and whose houses prepared coffins. That night, hundreds of miners forced to recruit several large coffins to come back.

Of course, gunpowder is indispensable. Recently, the gunpowder in Xinjiao was pulled up to several thousand kilograms, and the spare gunpowder on Fu Ship also came in handy. He raised tens of thousands of kilograms. Mr. Chen still felt that it was not enough. He boiled wax and painted all night, and no one knew what he was painting.

Bai Yuanjie and Zhang Yongshou led their troops to attack again in the evening, and retreated without fighting, bringing back a long rope with knots. The knot was from the camp to the trench, from the trench to the base of the city wall.

The flag army logged wood, and the miners started work overnight.

At first, the mountain master was frightened to death by forcing him. He thought the flag army was asking them to fight against the Japanese pirates, and they cried in the camp one by one. Later, he heard that he just dug a big hole and started construction in a daze.

"What does this picture mean?" Bai Yuanjie took Zhang Yongshou and bit her lip and looked at the picture drawn by Chen Mu. She couldn't tell the reason. Bai Yuanjie pointed at her and asked, "Is this the city wall?"

Bai Ye said that this simple drawing style is not easy to accept.

Chen Mu was thinking about the principle of lifting the coffin and lifting the city. He dug a big hole under the city wall. With a bang, he could blow up the solid city wall several meters high?

Why does he feel so unreliable?

So his plan was not that simple. The miner dug tunnels to the trench to avoid being discovered by Japanese pirates when walking on the road. Then the trench was only a dozen steps below the city wall. The miner dug out three earth roads separately to deeper under the city wall, and dig out several adjacent large holes. A dig out the wall between the holes and set up wooden pillars to bear the load.

At that time, the large hole outside will be sealed and only the leads will be left. Once the coffin is blown up, the load-bearing earth wall and the wooden pillars will be fully opened, the city wall will collapse, and the huge vibration will naturally shake the wall bricks.

The project volume is very large and it will not be able to come down in a few days.

Xinning sent rice and grain the next day, and Chen Mubai Yuanjie didn't need anyone to send someone to urge him.

People, they are smart!

"Come from Xiangshan, the people of Xiangshan don't give rice and grain, right? But when they come to Xinning to fight, the people of Xinning will definitely prepare rice and grain." Zhang Yongshou's eyes were confused, and he smiled and threw a peanut into his mouth, sarcastically: "I remembered the soldiers when I was in war. I was using us as bandits to guard against them, for fear of stealing them."

Chen Mu didn't know what to answer, so he smiled and didn't say anything. He chewed in his heart and felt that the words had a little smell.

Isn’t this the reason why I think of a good wife when I have a poor family, and a good general when I have a difficult country.

However, Bai Yuanjie didn't say anything but drank porridge a little faster. She raised the wooden bowl and drank the remaining white porridge. Then she put the bowl and chopsticks down and glanced at Zhang Yongshou, urging: "Military households eat food and go to fight to kill the enemy. The common people shouldn't owe us, don't keep saying useless nonsense."

"Have you finished eating? Go to the camp after eating. I'll be feinted again later."

Zhang Yongshou pursed his lips and hummed twice and left the bowl and hung the knife to get out of the tent, "I understand."

After Zhang Yongshou left, Bai Yuanjie asked Chen Mu worriedly: "Can the coffin be useful?"

On the shore outside the besieged camp, the sound of ships and cannons sounded again, and several small cannons on the position also roared. With the sound of horns, drums and cannons, the flag army roared towards the city gate.

Under the cover of artillery, the Japanese pirates in the city fled in a snail and were rushed to the door by the flag army. They moved the bricks and stones and wooden pillars blocking the door with all their might. Then Zhang Yongshou gave the order and the flag army scattered.

The Japanese pirates rolled down on the city gate tower with stones in their arms.

Another feint attack returned without success.

Chen Mu crawled into the hole at night and looked at it. The miners were very comfortable doing this. Underground, not only did the supporting wood and beams tied up on both sides of the hole to prevent landslides, but even the bottom was paved horizontally with bamboo, and a little slope was dug inward to make it easier for the coffin to go in.

There were countless barbed woods in the trench below the city, but the miners unloaded a path on the first night, and the barbs were thrown to cover up. The bottom was connected to the city and dug a large hole. Even if the soil transported out was filled with two sections of the trench, it would take a waste of money and could only transport it to the camp.

Chen Mu plans to form one-tenth of the engineer troops in the future. These people will not be of much use in the encounter battle, but once they are attacked, they will be besieged or even defended, the engineer troops are too important.

Everything is experience. Although Chen Mu really didn't plan to attack the city several times, he tried his best to transform his creativity, memory into real talents and experience through practice.

He carefully outlined the key points of the tunnel excavation of the explosion city, and even outlined his description of the subsequent development trend of the bird gun in his hand.

It takes Chen Mu absolutely to completely replace cold weapons with firearms. It is conceivable that firearms and cold weapons have been in parallel for a long time. Even if the flintlock rifle is still in development, it cannot completely replace the advantages of the Sanzhang Spear in close combat.

But it does not mean that it cannot develop towards this trend. The captured Spanish heavy muskets and past grenades provide Chen Mu with ideas.

After fighting this battle, he would talk to Guan Yuangu about these issues.

"Brother, I've dug it!"

Shao Tingda broke into Chen Mu's military tent at night. It was his turn to supervise the work tonight, and there was only a few projects left. After digging, he hurried over and called Chen Mu. He thought Chen Mu was asleep, but he didn't expect to draw on the notebook with a charcoal pen again.

The entire Qianhushou Banners in Xiangshan did not understand why their Qianhushou did not like to use large pens and wolves. Instead, they always put a few charcoal pens on their bodies that craftsmen used and tied them with fine cloth strips very carefully.

Shao Tingda had some speculations about the reason. He had seen the large stone erected by the shipyard on Xiangshan shore. The handwriting on it was really ugly.

Close the notebook and put it in a leather wooden backpack that is similar to most flag officials. Chen Mu got up and showed joy on his face, "Dig it? Wait for a few days, let's go and have a look."

The large coffin filled with gunpowder was inserted into the tunnel, pushed back and pulled it into the big hole under the city. The heavy coffin pressed on the bamboo stick, causing the entire tunnel to squeak and strange echoes.

The flag officer issued a dead order and did not allow him to shout trumpets. The flag soldiers all blushed and gritted their teeth and pushed forward hard. Everyone was even more at the throat when they approached the trench.

But there were dark holes outside, and all the Japanese pirates in the city went to sleep. No one noticed all the actions under the city... What if they found out?

The authentic tunnel was dug up, and even if this matter was settled, no one could stop the fate of Guanghai Acropolis being bombed.

In the middle of several pits underground, the flag army lifted up the coffin and covered it with a fuse. The fuse was covered with bamboo strips and extended it far away. The tunnel was slowly sealed, and a large number of flag army climbed out of the tunnel with the fuse.

Chen Mu put the torch up, and with the sound of hissing smoke, the nitrification fuse slowly burned and extended into the hole.

In the dark night, people's eyes looked at the Acropolis reflected the light of torches.
Chapter completed!