Zhuge Liang's cutting of the water pipe did not affect Cao Ang's plan to drain the moat.

Cao Ang drew his bow from left to right and dug a ditch with the moat overnight, leading the river water to his feet, and digging another ditch with the artillery tunnel, which also leads it to his feet.

In order to prevent the silt from being blocked, he also made a unique idea of ​​pouring the connection ports of the two ditches with concrete, and blocking the entrances on both sides with isolation nets so that all the water flows in is clean.

After three days of busy work, after the ditches were connected, I was sadly aware that the water connected to the two ditches could flow through them by themselves. There was no need for a water pump at all, but it was not considered useless work. At least the purpose was not achieved.

After thinking for a long time, I simply installed the isolation net at the entrance of the tunnel of the artillery tower to prevent mud from pouring in and blocking the tunnel.

As for the water pump, since there is something to do, the water flows very quickly when it is two-pronged.

Li County, Zhi County and Bowang County are not far away. Every day, messengers travel back and forth to report the combat situation in various places to the commander Cao Cao.

I heard that after Cao Ang arrived in Bowang, he either built bomb droppers or dug soil every day. Now he is fascinated by water pumping. He has never done anything serious before. He has never even launched a decent attack once. Cao Cao couldn't sit still and handed over the army to Cheng Yu and Xun You, and took Guo Jia and Zhong Yao from Zhixian to Bowang.

When Cao Ang learned that he hurriedly took people out of the camp to greet him, he licked his face and smiled, "Father, why are you free to come to Bowang for a ride? Zhixian has captured it?"

Cao Cao scolded angrily: "Stop talking to me. Your uncle Xiao (Cao Ren) is fighting fiercely. You are here for almost half a month and have not fired it. Why are you doing in the camp day by day? And what's the matter with the water pump?"

Cao Ang said with confidence: "No matter how powerful my son Xiao Shu was, he didn't take Li County down. What's the matter? As for the water pump, it's a false hearing and a false hearing. Let's go over and take a look."

When Cao Cao thought about it, he followed Cao Ang to the next to the ditch. He looked closely and saw that there was a ditch about a meter wide on the left, which was directly connected to the moat, and the same ditch was a ditch connecting the artillery tower. The two ditches were connected to each other. The water from the moat naturally flowed to the tunnel entrance through the ditches.

As for the water pump, it is pumping in the ditch.

Cao Cao ordered people to pick up the water pump, carefully observe its operating principle, and said dissatisfiedly: "Why don't you tell me if you have such a good thing?"

This is a provocation.

Cao Ang smiled and said, "I dare not tell you the old man if I haven't tried it successfully yet. If I fail, where can I put my face on my son's face?"

Cao Cao understood the virtues of this rebellious son, but instead asked: "Then you plan to use this thing to flood the underground passage. When will it be flooded?"

With the current water flow speed and the length of the tunnel, no matter how you look at it, you feel that it is not reliable than digging authentic tunnels and bombing artillery towers.

Effective is effective, but the efficiency is too low.

Cao Ang smiled bitterly and said, "Isn't this impossible? Look at the city wall, it's so high that it makes people desperate. There are many defenders in the city who have enough food and supplies. If they attack for a strong attack, they will not be worth it."

Cao Cao was silent and said nothing more.

Wancheng's defense line is too strong, and if you want to win it at the lowest cost, you can only waste it slowly.

Let's waste, anyway, they don't lack food and grass or time now.

Cao Cao was concerned about the pumping situation and did not leave immediately. He stayed in the military camp. On the third day, he finally couldn't wait to return to Zhixian. As soon as he left the northwest of the military camp, a huge convoy appeared. When he asked, Huang Zhong was back with a sack.

Now I'm not in a hurry to leave.

Huang Zhong came to the front and found that Cao Cao was also obviously stunned for a moment. He quickly bowed and said, "I have seen Your Majesty and the Crown Prince."

"No gift."

Cao Cao asked, "How many sacks will General Huang bring back here?"

Huang Zhong replied: "Your Majesty, I have searched all the sacks near Luoyang and ordered the factory to speed up the production of a batch, bringing 800,000. In addition, the Luoyang factory is speeding up the production, and the second batch will be delivered in three days."

Cao Cao nodded with satisfaction, turned around and looked at Cao Ang and said, "It's your turn to perform."

Cao Ang said with a quick look: "Brothers, work."

The group pushed the trucks into the camp to prepare to attack the city.

Cao Ang handed over the task of siege for the first time to Zhao Yunjun. More than 20,000 troops operated in batches, loading sacks with sacks, and debugging bomb droppers with slaughter machines, and quickly became busy.

Although the Wei army has not sieged the city for more than half a month, it has not been idle. It has built up as many as 2,000 long-range bomb droppers and three piles of earth.

Now that sacks are delivered, everything is ready, it is time to show off your skills in siege.

The two soldiers were in groups, one of them held their pockets and the other was holding a shovel. They filled a bag of soil and tied their pockets tightly and threw them aside to put the next bag. Someone sent the sack to the front line.

The bomb dropper was quickly pushed into the range, with six hundred red cannons along with it.

When he arrived at the location, he started to do nothing and sent the sack full of soil to the bomb dropper to hit the city wall. The red-clothed cannon was not idle either. At the same time, the cannon fired to suppress the firepower in the city to prevent the opponent from using shells to destroy it.

Thousands of long-range bomb droppers exerted force at the same time, and thousands of sacks were fired out, sliding through the air a graceful parabola, successfully smashing into the moat, splashing countless water.

One wave followed another. Finally, the soldiers who operated the bomb dropper disliked that one sack was too slow to launch, so they directly increased to three.

The bomb dropper is powerful, and it is no problem to launch a thousand kilograms of huge rocks, and three sacks are even worse.

This will result in three times efficiency, and other soldiers are inspired to follow suit.

For a moment, the sky was full of hundreds of pounds of sacks flying, and the scene looked spectacular.

Zhong Yao praised: "It's only a matter of time before persevering at this speed."

The moat is the most important defense of the city. If you want to go there, you can only use ladders and other equipment. However, no matter how powerful the equipment is, it cannot withstand explosive packs. If you can fill the moat, your attack will be much smoother.

Cao Ang despised: "This is where I go. My goal is to use sacks to build a slope that leads to the city wall, so that the cavalry can rush up directly. It's only September now. I'm going to be a man in September next year. How can I do it without the spirit of Yugong moving mountains? The Wancheng defense line is the most solid defense line of the pseudo-Han. If we break through here, our army can push the front line to the Yangtze River without any trouble and force Liu Bei to the south bank, hehe."

Cao Cao slapped him on the back of the head and cursed with a smile: "If you have nothing to do, you will be so proud of yourself."

Cao Ang's neck instinctively shrank and said aggrievedly: "Dad, can't you praise me?"

Cao Cao rolled his eyes directly, continued to turn his eyes to the bomb dropper that was firing with all his might, and looked at the sandbag flying all over the sky and said with a smile: "Xu Chu, send a message to Cheng Yu, we should do the same, bury the earth and flood the tunnels in the city walls, and it will take two years to spend."

Now the big-eared thief cannot retreat. Every time a gun tower is knocked down outside the city, it will cause countless damage. Too much casualties are not good for the morale of the army. Since this is the case, just use this stupid method to do it first. The big-eared thief cannot support it, so he will naturally go out of the city to look for fighter opportunities.
Chapter completed!