Although Deng Ming was full of confidence, Liu Tichun was still skeptical. In his opinion, the power of gunpowder could only push an iron ball projectile out of the cannon chamber, and it was unimaginable to blow up a few meters thick city wall. Yuan Zongdi also knew the lesson of Liu Zongmin's failure, but he was inclined to give it a try. He felt that the Battle of Kunming seemed to prove that the Third Prince had a special promotion effect on the fire. According to Zhou Kaihuang's description of the explosion in Kunming arsenal, it seemed that the Third Prince had a range of action of several miles in diameter, and the power of gunpowder could be greatly improved in this range.

As a modern man, Deng Ming believed that it was natural to use gunpowder to blast. In his original world, this tactic would not be widely used until the Taiping Heavenly Kingdom period. The most typical example was Yang Xiuqing's attack on Nanjing. The city wall was built by Zhu Yuanzhang. The wall foundation was fifteen meters thick and more than ten meters high, which was as solid as a gold medal. At that time, Lu Jianying, the governor of Liangjiang of the Qing Dynasty, had only 5,000 people in his hands, so he dared to rely on the Nanjing wall to resist hundreds of thousands of Taiping Army, which was known as one million. Lu Jianying believed that the city of Nanjing was solid. Zheng Chenggong, who had a large number of artillery in the early Qing Dynasty, could do nothing to do with it, and defending the Taiping Army was not a problem.

At first, the Taiping Army was really helpless. Although the Qing army, which had a hundred times the strength of the city, could not break through the city defense. The Taiping Army once concentrated artillery to launch artillery on the Nanjing city wall day and night, the dense shells were blocked by the 15-meter-thick city wall, which could only cause limited damage to the buildings on the city tower. Later, Yang Xiuqing dug the tunnel to the base of the Nanjing wall, filled the coffin with black gunpowder, closed the tunnel and blasted it, and blew the almost indestructible Nanjing city wall, thus seizing the city.

Deng Ming originally suggested building a wooden container, but Yuan Zongdi and Yang Xiuqing coincided with each other and said why bother so much? Is it okay to dig a coffin?

After the soldiers found a few pretty solid coffins from the graves, Deng Ming picked one of the most solid ones. The Ming army's plan was to first transport the empty coffin into the tunnel, and according to the size of the coffin, dig a hole in the wall foundation of Yunyang, then pour out the gunpowder from the bag and put it in the coffin and stir it evenly.

Deng Ming always felt that digging graves and taking coffins was immoral, but looking at Yuan Zongdi's indifferent appearance, Deng Ming knew that it was useless to persuade him, but he thought in his heart that if the blast could succeed, he would have to make his own container in the future. Liu Tichun watched the soldiers' preparations from the side, but still didn't believe that this move would work. After all, he had never heard of a successful precedent, and only Liu Zongmin's failure lesson. Liu Tichun didn't believe how much effect such a small amount of gunpowder could play.

No one knows the strategy of blasting at present, except Deng Ming, and he will not understand the importance of enclosed space. Therefore, Deng Ming took his personal guard to check the gaps under the wall foundation.

Taking advantage of Deng Ming's departure, Liu Tichun complained to Yuan Zongdi: "Even if the coffin is filled, at most it will be ten bags of gunpowder? If it is used to fire the cannons, can these shells blow out the gap in the city wall? It would be great if it could be removed." Liu Tichun still felt that gunpowder could only push the cannon projectiles. Even if all the gunpowder in the entire army was used to fire the projectiles, it would not be able to smash the walls of Yunyang. Then some of the gunpowder was of course not good, let alone not even have an iron ball.

"Didn't you say that Kunming has the word "Ming" that will make fire prosperous?" Yuan Zongdi felt that there was no need to go against Deng Ming. Since the siege, the third prince has been studying hard and has never pointed out. Now he has put forward the only suggestion and is full of confidence. It is difficult to refuse flatly: "Isn't Yunyang also the word "Yang", which is also the same as fire. Besides, Mr. Deng, the fire virtues of the three hundred years of Emperor Ming Dynasty, is that a joke?"

Liu Tichun just complained casually. He and Yuan Zongdi had similar ideas. Since Deng Min insisted, he had to give him a try. And even if he failed, they would never blame Deng Ming for wasting gunpowder and time, but would definitely comfort him.

When the Ming army was digging the foundation of the wall below, the Qing army in the city was digging a canal behind the wall. The defenders of Yunyang did not think that the Ming army would attack for a strong force, so they did not plan to go out of the city to counterattack the mound, but chose the counter-drawing strategy of digging the canal. The excavation speed of this canal was not very fast. The Qing army believed that according to the normal progress, it would take many days for the Ming army to hollow out the foundation of the wall. At least the guards have not seen the Ming army transport the wooden stakes into the tunnel. However, the work should be done. If the Ming army is unable to think about it and really want to dig the city wall in Xunyang, the Qing army guards will immediately flood the tunnel and give the Ming army a color.

When the Qing army general was digging the canal step by step, he did not know that the Ming army's siege preparations were almost completed at this time, rather than the ten days he expected.

The coffin used for blasting is already filled with black gunpowder. Before sealing it into the wall foundation, Deng Ming still needs to test the fuse. The best fuse material is undoubtedly black gunpowder, which can react without any air. In order to prevent the fuse from getting damp, Deng Ming made a long strap with asphalt cotton cloth, which was filled with gunpowder.

First, he buried a bag full of gunpowder in the soil to test it. After confirming that he was competent for the fuse, Deng Ming ordered the coffin to be stuffed into the hole dug out, and he himself was responsible for sealing it in the tunnel. The section of Yunyang City Wall that was chosen to blast is about three meters wide and the base of the wall is nearly five meters. The hole dug by the Ming army was about four meters deep, and the coffin was placed directly under the wall. A hole was made in the coffin board facing outward. For insurance, two fuses were placed, and then the holes were filled.

The materials used include a large number of stone bricks. Deng Ming first built a wall, then pasted a layer of soil, and then started building a second wall; the bricks on the lower wall and the bricks on the upper wall were placed interlaced, and then a layer of soil was pasted... layer after layer. Deng Ming was afraid that the sealing was not good, so he had to sandwich the layers between them. He didn't know how many walls he built in the end, but there were countless. The tunnels dug out were blocked by the brick wall, and the sealing layer might have to be more than ten meters wide. If the fuse was not long enough, Deng Ming originally wanted to build a few more walls.

After the stone bricks were arranged, Deng Ming was still worried that the seal would loosen and the explosion would fail, so he used a few large pieces of wood to press against the outermost wall.

While Deng Ming was carrying out sealing work in a intensive manner, the Yunyang guards curiously observed the movements of the Ming army at the top of the city. When they saw the Ming army transporting stone bricks into the tunnel, the Qing general was puzzled: Is this to help me repair the foundation of the wall?

Although transporting wood into the tunnel is a normal step for cave attack, it also seems very strange to fall into Qing General's eyes. He is sure that Ming Jun could not dig out a large enough cave so quickly. Now that transporting wood into it will not have any other benefits except causing trouble for excavation and soil transportation.

Under normal circumstances, the transport of wood into the tunnel is also dug and transported as soon as it is dug. Whenever a piece of land is hollowed out, a piece of wood is used to support the wall foundation. It is impossible to dig it in one breath and then transport the wood in at the same time, because the wall foundation will sink long ago and crush the people who are digging inside to death. In the end, the Qing army general felt that the wood transported by the Ming army into the tunnel did not look suitable for supporting pillars, and the Ming army would not continue to transport it after transporting a few pieces, which obviously gave up.

"Hmph! Even if you train troops, you have to do it properly and it will be effective." General Qing sneered at General Ming under the city. He didn't understand what the Ming army was going to do until the end, but he concluded that the enemy was still training the team, and the training was going very sloppy: "If the recruits saw it and thought that this kind of small wood could be used as a pillar, it would be a big joke to really attack the city in the future!"

With extreme contempt for the enemy, the Qing army general left the city wall and went downstairs to check the progress of the canal excavation. He felt that his serious attitude was in sharp contrast with the perfunctory Ming army outside: "Look at me, even though he knew that the other party would not really attack, he still had to dig a ditches seriously, dig a pond and store water... This way, training troops will be effective."

Although he did not agree with Deng Ming's plan, when Liu Tichun saw Deng Ming crawling out of the tunnel in dust, he still felt that this family member was indeed different. Generals who were generally disdainful to experience the things that went down the tunnel.

Deng Ming made a new fuse, firmly connecting it with the fuse in the tunnel, and still used incense candles as a delayed fuse. After all this was deployed, Deng Ming asked Liu Tichun and Yuan Zongdi to order the army to stay away from this area. If the black gunpowder did not explode, at most there would be a scorching airflow, but if there was an explosion, there would definitely be a shock wave. When Deng Ming was in Kunming, he had experience it and now he hoped that the explosion's shock wave could destroy the city walls of Yunyang.

Because there has never been a blast, Deng Ming didn't know how far people were to be safe, so he kept asking everyone to go further. In the end, the Ming army retreated one mile away from the blasting point.

The Yunyang defenders noticed the abnormality of the Ming army and felt that the Ming army had too many strange behaviors today, which made them confused, but they did not think that it had anything to do with the city wall. Even if the time was enough, even if the Ming army had completed the preliminary preparations for the acupuncture and planned to burn the pillars and let the city wall collapse, they should not hide the army so far. Even if the city wall collapsed, it would not disappear without a trace. It would be a very successful acupuncture that could cause a slope for climbing.

Generally, before launching a hole attack, the attacker will set up an offensive formation in front of the target wall section and prepare to seize possible slopes at the first moment. The defenders will also be alerted, and will also concentrate their troops to prepare to defend the dangerous city wall and at the same time release water to flood the tunnel.

After seeing that everyone was away from the dangerous area, Deng Ming lit the incense and candle with his own hands, then quickly left the tunnel, ran to the horse not far away with all his strength, jumped onto the horse's back and left the mound without looking back.

Yuan Zongdi and Liu Tichun were waiting to see the result of Deng Ming's hard arrangement.

There were not many Ming troops around them. At this time, most of the Ming troops were building cloud ladders in the distance and digging plum blossom piles. The excavation of tunnels under several other new mounds continued. Among the people, the most enthusiastic one was the group of guards who had been to Kunming with Deng Ming, but a few of them, such as Li Xinghan, were worried that the amount of gunpowder was too small. After all, a coffin gunpowder could not be compared with a warehouse gunpowder in Kunming. After Zhao Tianba and Mu Tan heard about Deng Ming's plan, their reactions were similar to Liu Tichun. They had never heard of this tactic, so they were a little suspicious.

Because I was worried that the ventilation conditions in the tunnel were not good, the incense candle inserted on the gunpowder cable was very short. Deng Ming estimated that the fuse should have been lit now. The wall building process was filled with dry soil, and the gunpowder bundles inside the wall were wrapped in cotton cloth, so there should be no problem of moisture.

"I don't know if the gunpowder in a coffin is enough." Deng Ming also had the same concern. He knew that the fuse would soon ignite the gunpowder in the coffin. After the hundreds of kilograms of gunpowder fully reacted, it would turn into a ball of high-pressure gas with a very high temperature, which would probably be about a thousand degrees. If the surroundings could withstand this pressure, the ball of gas would finally cool down and escape from the gaps continuously, causing Deng Mingbai to work hard; and if there was a certain direction that could not resist this pressure, the ball of gas would break out of the ground and cause a violent explosion.

"If enough gunpowder is enough, where will it spew out?" Deng Ming thought about this question. The center of the earth is definitely impossible. No matter how high the pressure of the air mass is, it cannot run down the ground; the other three sides of the horizontal are solid earth, and the more fragile side is in the direction of the tunnel. Even if a brick-and-soil mixed wall is built with a thickness of more than ten meters thick, its strength cannot be compared with the earth.

But the most fragile one should be the city wall located above the blasting point. Deng Ming remembered that in junior high school physics, it seems that pressure is equal to the product of area and pressure, and the area on the upper surface of the coffin is the largest.

"Fortunately, I pushed the coffin straight in." Because digging tunnels is a very hard work, when digging holes under the foundation of the wall, Ming Jun naturally used the size of the front section of the coffin as the standard, and the workload was small in size. Deng Ming felt that the fragile tunnel direction should be relatively small because of the small cross-section.

However, Deng Ming thought of many shortcomings. Since the size of the confined space is inversely proportional to the pressure, the space in the hole should be filled as much as possible. The coffin should also be fully compacted with stones to minimize the space. If half of the space can be reduced, the pressure can be doubled and the pressure will be doubled. In the future, you must use a special container to fill the gunpowder, preferably a wooden box with a wide upper surface and a very low surface, so that the direction you want to destroy is as much pressure as possible.

With so many places that need improvement, Deng Ming was extremely upset about not being able to think of them earlier, and he was even less sure whether he could succeed today.

Zhao Tianba, who was standing next to Deng Ming, noticed Deng Ming's face with joy and sorrow - it was because he remembered the pressure and pressure formula; it was because he immediately discovered that his design had many shortcomings; then Zhao Tianba heard Deng Ming sigh again, and when Deng Ming thought that he did not have all his efforts to fill the blasting space, he suspected that this omission would greatly reduce the success rate of blasting.

"gentlemen……"

Zhao Tianba turned his head and wanted to comfort Deng Ming, but as soon as he opened his mouth, he felt the ground under his feet suddenly shaking, and then a deafening explosion came to his face, cutting off the words he had not had time to spit out.

Zhao Tianba turned to look at Yunyang, and could no longer see any city walls, only smoke in the sky, and the smoke and dust pillars that surged in the air.

Those who had been facing Yunyang City did not see clearly what was going on. Some Mingjun had a particularly good eye-catching feeling felt that they seemed to see the Yunyang city wall burst from the inside out, bricks and stones and the dust inside rose into the air, as if a dragon was about to emerge from the belly of the city wall. At the same time, the dragon rushed into the air from the surface, and the smoke and dust brought about the Yunyang city wall was covered tightly and nothing could be seen.

All the Ming army raised their heads and looked at the smoke column that was running upwards, as if there was still gunpowder that had not been burned. After a long time, a rain of gravel fell from the blasting point, and a large number of broken bricks fell from the air back to the ground, sprinkled far away, and even fell on the head of Ming army who was watching the movement in the distance.

Liu Tichun, Yuan Zongdi, and Deng Ming were also hit by one or two small stones, and some gravel on the ground was rolling around. At this time, they still could not see the city wall behind through the smoke and dust.

"The explosion was like an explosion, but I just don't know how effective the explosion was?" Deng Ming was anxious to see his achievements, but the city of Yunyang was filled with yellow smoke and dust, and nothing could be seen.

When the explosion occurred, the garrison in Yunyang was drinking tea with the prefect in the yamen, exchanging contempt for the weak and powerless offensive of the Ming army. When the shock wave arrived at the yamen, the aftermath was already very weak, and it could not even shake out the water from the teacups of the two. However, the loud noise still made the civil and military officials in Yunyang feel suspicious and walked out of the yamen to see what strange things happened.

When these two people arrived at the blasting site, the smoke and dust had dissipated a lot, so they would not be unable to see people a few meters away like when the explosion occurred.

The guard bent down and looked at the ground. The ground was covered with gravel, which looked full of fragments of wall bricks. The closer to the blasting point, the denser the fragments and larger the volume. Some Qing troops fell silently to the ground, while others were struggling to ask for help. The guard saw that blood was flowing out of the nasal cavity and ears of the soldiers. The rubble and the soldiers' faces were covered with a thick layer of dust. The guard reached out and touched it, and it felt like it was sand used for building a city wall.

At this time, a strong wind blew, blowing away the already thin dust. The guard raised his head and saw a huge wall gap appearing in front of him. The brick surface was gone without a trace, and the walls near both sides of the gap did not fly, and the soil inside was completely exposed. The gap was radial, and the starting point was directly above the blasting point. Through this gap, the guard suddenly found that he could see the Ming army on the ground in the distance.

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