To Wu Haogu's expectations, he was actually a big military strategist... a Vaubon-like big military strategist!

Vaubon is French Marshal Sebastian Le Prestre de Vaubon, a famous military engineer, authoring military works such as "On the Attack and Defense of Fortresses", "Collection of Papers on Building a City" and "Siege of the City".

During the period when Huang Silang, He Tianran, Zhou Daxia, Zhu Xingshu and others rushed to Kaifeng Prefecture, Wu Haogu also began to write two works that are of great significance to later military science, one is "Engineering Science" and the other is "Gunpowder Weapon Science".

Don’t underestimate the role of these two military theoretical works. "Engineering Science" laid the theoretical foundation for the emergence of the type of engineer. Although digging trenches and building cities has long been part of the military, engineers are not a type of troops, but are mixed with ordinary infantry or auxiliary soldiers.

Because there is no engineering force, the research on various military projects cannot be carried out systematically, and there is no professional military engineering force. Therefore, the Song army's efficiency in siege and building cities has not been maximized.

As for "Gunpowder Weapons" it is even more powerful. Later generations almost regarded this book as a symbol of the arrival of the hot weapons era!

In this military work, Wu Haogu regards the manufacturing, research and application of firearms as a science guided by positivism.

At the same time, Wu Haogu also proposed three research directions for firearm research, namely: gunpowder research, firearm research, and firearm application research.

Moreover, Wu Haogu also "creatively" proposed two types of firearms, "blasting firearms" and "tubular jet firearms". He also proposed some possibilities for the use of engineers and water army firearms, including the blasting siege method...

With the direction, tools (positivism), money, there are a few talents in research, and there are also "brain insights" in research. Will the research on firearms be slow?

Of course, in the late autumn of the third year of the founding of the Jingguo period, Wu Haogu's "Engineering Science" and "Gunpowder Weapon Science" had just begun, and it was far from the end of the book.

However, the method of blasting and siege in the cave has begun to be tested by practice!

In the northwest of Kaifeng Prefecture, a corner of the Moutuogang Horse Farm belonging to Tiansijian, is used in the schoolyard where the imperial military performance is held. Among the Wuhaogu members of Kaifeng Prefecture, all military-related leaders gathered together. Tong Guan and Pan Xiao'an, Mi Youren, who had just returned from Haizhou, and a military officer named Gao Shixuan, also came. They all had neat clothes and jackets, surrounded by Wuhaogu, and looked at the half-rammed earth wall in the schoolyard with a strange look.

This half of the rammed earth wall is less than 50 steps long, about 15 steps wide, and is only a height of only one foot. There are no warheads on the top of the city. The city tower is actually a bare rammed earth wall.

Several military craftsmen who were transferred from military weapons to monitor gunpowder and transferred firearms to a crypt. They were sweating profusely transporting bags of freshly prepared gunpowder into a crypt.

The spectators around were talking.

"This method is fresh. Dig a hole in the ground to transport the gunpowder to the underground of the city wall and ignite it..."

"Can it work? That's the city wall! Can it collapse with gunpowder?"

"Yun, I'll look at Xuan!"

"You have to try it out, this is called practical verification!"

"Haha, "The Empirical Theory" can still be used to fight wars."

"Not it! My teacher's "Personal Theory" can be used anywhere!"

Wu Haogu was also looking at the city wall in front with his hands behind his back, and people were not impressed by the discussion. Although he knew how to "attack the city from the cave", he was not sure how many kilograms of gunpowder were used to collapse a city wall. So he used 1,000 kilograms of nitro powder, sulfur powder, and charcoal powder at a rate of 15:2:3 from Wu Haogu's later memories, but the difference is not very big with the recipe provided by gunpowder craftsmen.

There are three standard formulas for military weapon monitoring gunpowder, which are used to create "gunpowder" for the purpose of deflagration, combustion and poison release. Among them, the gunpowder formula for deflagration is 40 taels of nitrogen, 21 taels of sulfonium, and 18.2 taels of charcoal.

It almost seems that the nitrate accounts for 50%, and the formula provided by Wu Haogu is about one-third less. Therefore, the explosion effect is not good, but the general direction is not wrong. If you use the scientific method provided in "Empirical Theory" to conduct experiments, I believe that the correct formula will not be found long.

However, the granulated black gunpowder did not appear, and the purity of nitrate and sulfur was not very ideal. In addition, the technology of bomb shell manufacturing and tubular tube manufacturing of tubular firearms is still very primitive. Therefore, it is still very difficult to create a firearm that can show its power in the field.

However, using gunpowder to blast the tunnel and collapse the city wall should be technically mature!

This is Wu Haogu's golden finger that can reverse the process of the Song and Xia war! But this method is not difficult. It can be completely imitated for the Liao Kingdom and Xixia, which can also produce gunpowder...

A young craftsman named Chen Jian ran to Wu Haogu, "Xuanzan, can you start?"

Wu Haogu glanced at the young man in front of him, and his eyes were quite handsome. He just didn't know how the explosion skills were?

"Let's start!" Wu Haogu took back his mind, gave an order, and then covered his ears with both hands.

Chen Jian responded and rushed to the entrance of the tunnel, took the torch from a craftsman named Shi Lang, and then lit the leads placed in the bamboo tube split in half.

The cotton thread soaked in the stinky water quickly burned, and the flames quickly moved along the tunnels supported by large wooden horizontal boards, and in a blink of an eye it penetrated into a coffin filled with gunpowder. The contact between the flames and gunpowder quickly produced a violent chemical reaction, and also opened a new era!

Rumble...

While the dull explosion sounded, everyone, including Wu Haogu, felt the ground under their feet suddenly tremble, as if some giant beast hidden deep underground was swinging its bodies desperately and roaring.

"It collapsed, it collapsed!"

While Wu Haogu's attention was attracted by the vibration from his feet, someone suddenly shouted in his ear. He quickly looked forward and looked forward. One side of the rammed earth "city wall" which was only fifty steps wide collapsed. Maybe it was because there was too little gunpowder, maybe the tunnel was not located well, and the entire city wall was not blown up, but it also collapsed about half. The hard rammed earth collapsed, forming a slightly steep "hill slope". Infantry should be able to climb up the hillside!

Everyone who followed Wu Haogu to watch the explosion was shocked by the scene in front of him.

Can the city walls really collapse with gunpowder?

Tong Guan turned his head and looked at Wu Haogu with a look of evil eyes. Isn’t it too awesome? Even a difficult thing like a war can’t defeat him.

That guy Cai Jing is afraid he will miscalculate it!

"Xuanzan, it really happened..."

Huang Silang, who was appointed as the commander of the engineer by Wu Haogu, said tremblingly, "I'm going to make great contributions now!"

Wu Haogu shook his head, it was not very ideal! He waved to Huang Silang: "Silang, come here."

"Xuanzan, are you looking for me?"

Wu Haogu nodded and said to Huang Silang who was walking in front of him: "This is the first time... how to dig the tunnel straight, how to determine the direction, and the amount of gunpowder are not accurate. So I have to continue experimenting! I will give you five days to build the city walls. Let Zhu Xingshu lead someone to dig another tunnel.

In addition, some leather tape measure is also needed to measure distance. The calculation is not accurate when measured by visual measurement."

"The official understands!" Huang Zhisheng responded quickly.

Wu Haogu said to Tong Guan again: "Official, it seems that the method of blasting the siege in the cave is feasible! Let's go to the palace to report to the official family... This time we have to bring more saltpeter and sulfur on the road, and it is best to transfer more gunpowder to accompany the army."

"Okay," Tong Guan had already shown his smile, "We will accompany you into the palace now."

"Okay! Yuanhui, come together." Wu Haogu said to Mi Youren again, "The official family hasn't met you for many days, but I miss you so much!"

...

Wu Haogu and Tong Guan and Mi Youren entered the palace together not just to report the effect of the blasting siege technique in the cave, but to ask Zhao Ji for more troops and equipment!

According to Murong Wangyou's suggestion in the letter, Wu Haogu was preparing to form a combat unit of the palace with a total force of more than 10,000 people, called the "Guardian General of the Inner Palace". However, this "general" cannot fight alone, but is assigned to the Emperor's Dragon Mangster.

During the marching, the troops of the inner guard generals will be organized into the command of the Dragon and the Emperor's command in units of "teams". This is because the soldiers of the inner and outer generals do not have much time to train, so they cannot ensure that they can master the more difficult bows and arrows and shields (knifes), so they are equipped with spears. All the soldiers of the inner guard generals who cooperate with the army of the inner guard generals will be equipped with swords, shields and bows and arrows, and give up the spears.

In this way, in combat, the guards of the inner palace (man soldiers) will be responsible for forming a battle formation with spears for impact or defense, while the dragon heroes use bows and arrows to be responsible for long-range attacks or combat with shields and swords.

In addition, Wu Haogu also hopes to get at least 10,000 soldiers from the palace to serve as auxiliary soldiers and reserve soldiers.

If we add the adjusted imperial horses in front of the hall, the newly formed engineer command and the forces of the two-Zhi Du Yuhousi, the two-Zhi army commanded by Wu Haogu will have a total force of nearly 30,000 people!

This is no longer "straight", but has reached the scale of the Fourth Army!
Chapter completed!