"Hahaha, Jie'er, you are really my lucky star!"

Lin Chuan, who drew the drawings for the manufacture of cast iron artillery, smiled at Cao Jie very happily.

Seeing Lin Chuan's happy appearance, Cao Jie also smiled and asked Lin Chuan, "Sir, what's wrong?" ”

"I thought of a good way to break through the city of Goguryeo, and the soldiers of Great Wei should not have to bear huge casualties to capture Goguryeo this time!"

After Cao Jie heard Lin Chuan's answer, he was also very surprised and said, "Really? It's so good! ”

You must know that if Great Wei conquers Goguryeo one day earlier, he can subdue Xianbei one day earlier, which is really a good thing worth celebrating!

Today's siege warfare is limited by the primitive method of siege, the accuracy of trebuchets is poor, the number of uses is small, and the construction requires a large number of craftsmen.

The defenders of the castle not only had tall walls, but also moats, moats, and other facilities to cope with the siege.

Therefore, even if the army of the Great Wei had a huge advantage in terms of numbers, logistics, grain and grass supply, if it wanted to quickly capture the city of Goguryeo, it must pay the price of a large number of Great Wei soldiers' lives in order to break through the city of Goguryeo.

This is also the reason why Cao Cao allowed Kebi to raid Goguryeo first, as long as there was not enough food and grass in Goguryeo's city, then the time spent on attacking the city would be greatly shortened.

In addition to using this means of consuming food and supplies on the defending side, other siege methods require huge casualties.

However, Lin Chuan now drew the blueprints for the production of cast iron artillery, and the power of cast iron artillery is enough to concentrate on blasting through the city gates, or the weak points of the city walls, which is the best choice in siege warfare.

Then Lin Chuan and Cao Jie, who were in a good mood, continued to ride around Hanzhong City for a long time, until Lin Chuan saw Cao Jie's face flushed from the cold, and then returned to the Hou Mansion to rest and keep warm.

It is worth mentioning that after Lin Chuan discovered the coal mine before, in addition to using coal as fuel for the Hanzhong production base, he also built a fire kang in the Hou Mansion.

The entire Hanzhong Hou Mansion can be said to be as warm as spring.

It's a pity that among the coal mines discovered in Linchuan, the amount of coal that can be mined in the open pit is still not enough for the people of the entire Hanzhong County.

After Lin Chuan returned to the study of the Hou Mansion, he first told Cao Jie to go back to the room and have a good rest, for fear that she would catch a cold.

Then Lin Chuan came to the study and exchanged the cast iron cannon manufacturing drawings drawn in the system lottery.

Looking at the cast-iron artillery in front of him, Lin Chuan knew that Great Wei was about to enter a new era: the age of firearms!

In front of cast-iron artillery, the tall walls will no longer be a strong shield!

Coupled with the assembly line production of the Hanzhong production base, the Great Wei, which uses a large number of cast iron artillery, will become a nightmare for all civilizations that build cities!

The reason why cast-iron artillery is so powerful is that before its appearance, the development of artillery had gone through hundreds of years.

From the earliest bamboo cannons, to bronze cannons, and then to iron and copper core cannons, the manufacturing process and raw materials used in artillery have undergone continuous improvement and change.

In fact, the performance of cannons cast with copper as the main material was superior to that of cast iron in the early days.

Because copper has a low melting point, good ductility, tough texture, and is not easy to explode, it is a high-quality material for casting guns.

However, the casting cost of copper cannons was more than five times that of iron cannons, and cast iron cannons became the mainstream after technical improvements.

It just so happened that what Lin Chuan was drawing now was the casting blueprint of the cast iron artillery.

After carefully studying the cast iron artillery, Lin Chuan found that with the existing technical conditions of the R&D center, it was not too difficult to manufacture a cast iron artillery.

So Lin Chuan took the drawings of the cast iron cannon and soon came to the R&D center.

"Lord Hanzhong!"

Chen Yuan, who is in charge of the R&D center, came to the R&D center on the second day of the New Year.

Lin Chuan saw Chen Yuan in the R&D center, and immediately handed over the drawings of the cast iron cannon to Chen Yuan, ready to share this joy with him.

After Chen Yuan received the manufacturing drawings of the cast iron cannon from Lin Chuan's hands, he looked at a horn-like pipe placed horizontally on the drawings, and couldn't help but ask Lin Chuan suspiciously: "Lord Hanzhong, what are the manufacturing drawings of this thing?" ”

"This is the blueprint for the manufacture of a cast-iron cannon!"

Lin Chuan said to Chen Yuan very excitedly.

"Cast iron artillery? What is it? ”

Chen Yuan asked still puzzled when he heard this.

Then Lin Chuan began to popularize what artillery is for Chen Yuan, and Chen Yuan, who understood the power of artillery, looked at the cast iron artillery manufacturing drawings in his hand again, and finally understood the weight of the drawings in his hand.

"Lord Hanzhong, there are craftsmen in the R&D center, why don't we start the development of cast iron artillery now?"

Chen Yuan was a technical maniac, and now he only wanted to build the powerful cast-iron cannon in the mouth of the Marquis of Hanzhong.

"Hahaha, Ben Hou came to the R&D center, really to make this cast iron cannon, without further ado, Master Chen, you will gather the craftsmen who are still in the R&D center!"

"Good! I'm going to call them all!" ”

Then, in the R&D center, a dozen craftsmen gathered around after a while, led by Chen Yuan, and began to study the manufacturing method of cast iron artillery.

After two hours of repeated discussions, the manufacturing method of the cast iron cannon was finally determined, and then the craftsmen of the R&D center began to manufacture the cast iron cannon.

Lin Chuan couldn't help with the rest of the work for the time being, so Lin Chuan called Chen Yuan to his side and told Chen Yuan again: "Master Chen, you know the power of the cast iron cannon, and you must ensure that the manufacturing method and manufacturing process of this cast iron cannon must not be leaked out!" ”

Chen Yuan also nodded solemnly when he heard this, and assured Lin Chuan seriously: "Lord Hanzhong, all the craftsmen in the R&D center understand the importance of confidentiality, and I will emphasize the importance of confidentiality with them again when I go back later, please rest assured, Lord Hanzhong Hou!" ”

"Good! Then I'll wait for your good news, Master Chen! ”

Lin Chuan nodded when he heard this, and returned to the Hanzhong Marquis Mansion with confidence.

In the R&D center, Chen Yuan conveyed Lin Chuan's emphasis on the importance of secrecy to all the craftsmen involved in the development of cast iron artillery, and explained the power of cast iron artillery.

When the craftsmen heard Chen Yuan explain that they must keep the manufacturing methods and processes of cast iron cannons secret, they all nodded solemnly to indicate that they knew.

Then everyone threw themselves into the manufacture of cast iron cannons.

Lin Chuan, who returned to the study of the Hou Mansion, calmed down his excitement, and then sent a letter to Cao Cao.

In the letter, Lin Chuan explained the power of cast iron artillery, the great role of siege warfare, and explained the current progress of development.

In the end, Lin Chuan also specifically told Cao Cao that as long as the cast iron artillery was successfully manufactured and could be mass-produced, it would be easy to capture Goguryeo.

At that time, not only Goguryeo, but also Buyeo, Silla, and Baekje could be taken together.

After writing the letter, Lin Chuan sat alone in the study, imagining in his mind the spectacular scene of thousands of cannons firing and the enemy's city crumbling.