This man is tall and has a smell of iron filings all over his body. He is obviously spending time in the shop for many years.

Yang Fan quickly helped Zheng Hun up and smiled sincerely: "It is because of people like Master Zheng who are silently working behind the scenes that our army can win one victory after another. Your contribution is no less than Gao Shun and the others!"

After hearing this, Zheng Hun's body was slightly shocked, and then said modestly: "The villain is just a skillful skill. He should not be praised by Yang Piqi. General Gao and others are dignified generals. How dare the villain compete with General Gao!"

After hearing this, Yang Fan shook his head slightly, and saw him holding Zheng Hun's hand and said solemnly: "Master Zheng must not do this. To be honest, your contribution is greater than Gao Shun and others. However, you have different divisions of labor and different responsibilities, so I will say that your contribution is not less than Gao Shun and others. We all know that in marching and fighting, soldiers will inevitably die on the battlefield. Your improved armor and weapons can greatly increase the survival rate of soldiers on the battlefield. You can imagine how great your contribution is?"

Zheng Hun was flushed when Yang Fan said it, and was so excited that he trembled all over. He immediately bowed to Yang Fan: "Thank you for your respect, Zheng Hun has no way to repay you. He can only improve the sword as soon as possible to repay the lord's kindness for his lord's grace. Lord, look, this sword was created by myself and used some unique techniques. What do you think?"

Yan Luo, Zheng Hun climbed to the top of the weapon stand, took out a wooden box and placed it in front of Yang Fan. Then he opened it. He saw a knife with a similar shape to the new type of battle knife, lying quietly in the wooden box.

Yang Fan picked up the sword and started to sink slightly. He thought it was only five or six kilograms. Seeing Yang Fan’s inquiring eyes, Zheng Hun quickly explained: “My lord, the iron ore used to build this knife is selected from Jizhou. The iron tempered from its ore is very tough and has high strength. It is the best ore to build weapons and armor. Moreover, the output of Jizhou is the best in the world. Other prefectures and counties cannot be compared with it.”

After experiments, the toughness and strength of the swords selected from Jizhou Iron Mine are better than those of the swords made from iron ore in other prefectures and counties.

After Yang Fan pondered the sword in his hand, he asked, "What is the difference between this sword and the knife made of Montenegro iron ore just now?"

Zheng Hun explained: "The villain also had this inspiration because of the drawings given by the lord. The sword made of the Black Mountain iron ore is lightness and profit; while the sword made of the Jizhou iron ore is durable."

Yang Fan asked in confusion: "Light? Benefit? Does that mean fragility?"

Zheng Hun nodded and said, "It is precisely, after our repeated trials, this kind of war knife made of Montenegro Iron ore can collide with ordinary swords, at most it can impact each other more than a hundred times. After that, its blade body will collapse; while this kind of knife made of Jizhou ore is several times better than that. Although it has added weight, it can continue to fight."

After a moment of silence, Yang Fan stared at the sword in his hand and smiled: "It seems that after the autumn harvest, the attack on Jizhou will be put on the agenda."

Everyone agreed that Yang's army had 500,000 or 600,000 troops. After a battle, countless weapons were damaged. This is why Yang Fan did not dare to launch wars frequently after expanding his army. He really couldn't afford it.

But Yuan Shao is different. His territory, Jizhou, was already rich in iron ore. As long as he had enough blacksmiths, his weapons and armor would naturally be sufficiently supplied. However, Yang Fan could only rely on the iron ore in Shangjun and Heishan, and the output speed was naturally not as fast as Yuan Shao.

This is why Gongsun Zan and Yuan Shao had no choice but to lose the first game, but to lose the second game, and Yuan Jun had too much advantage in this weapon.

Just when Yang Fan was so sad, Zheng Hun asked: "Lord, please give these two knives a name!"

"Oh?" Yang Fan looked at the two battle knives in his hand, and a vicious plan rose in his heart. He saw the corner of his mouth slightly raised and said with a smile: "This knife made of Black Mountain Iron Mine is called a Black Knife! Since the knife made of Jizhou Iron Mine is improved and created by Master Zheng himself, it is better to call it Hun Knife. What about it? It is also possible to show Master Zheng's achievements on this knife."

Zheng Hun's throat was even more swallowed and asked excitedly: "Lord, are you really going to give this knife name after my name?"

Yang Fan nodded and smiled, "Of course, if Master Zheng thinks it is inappropriate, then I can change another name."

Zheng Hun shook his head and smiled, "No, no, the villain didn't think anything was wrong."

Gao Shun took the mud knife from Yang Fan, and while playing with it, he asked, "Master Zheng, can this mud knife be mass-produced?"

Zheng Hun nodded and smiled, "As long as the iron ore is enough, the blacksmith is enough, how much does it take, how much does it take!"

Yang Fan was overjoyed when he heard this, and then followed Zheng Hun to the third floor. This floor was developed for the development of cavalry equipment, ranging from horseshoes made by Yang Fan's instructions to big beasts on the battlefield and armored chariots.

This is an upgraded version based on the improvement of the chariot. The whole body is wrapped in iron armor and requires eight horses to pull. It is equipped with crossbow arrows and spears, which can attack from a distance and fight in close combat. It is a powerful weapon for combat in the plains.

When Gao Shun saw it, he played with it excitedly, like a child. Even Guo Jia and others were shocked by the huge body of the armored chariot.

Xun You exclaimed: "Who can compete with such a spoiler?"

Zheng Hun smiled bitterly and said, "This thing has its advantages and disadvantages. Although it is indestructible, it is difficult to move when it encounters a trapped place."

Yang Fan looked at the ancient 'tank' with bright eyes, rubbed his hands, and smiled and said, "It's okay, it's okay. Compared to its power, some disadvantages are inevitable. Master Zheng, you should hurry up and improve this thing! Is this energy produced?"

Zheng Hun said: "It will take a month to build one car with a hundred craftsmen, and it is difficult to popularize it."

"A month?" Yang Fan thought about it in his mind, then turned to Xun Yu and ordered: "Wenruo, after you go back, you will recruit blacksmiths from all over the world and raise the treatment. You must recruit tens of thousands of people. You are responsible for building such armored combat vehicles. I will produce hundreds of vehicles a month."

Xun Yu was about to nod and promise, but Yang Fan was poured with a basin of cold water by Zheng Hun. Zheng Hun said, "My lord, even if there are many people, it cannot be built. The iron ore output in Bingzhou is too low."

Yang Fan said indifferently: "It's okay, recruit people first, and after I take Jizhou, I can produce with all my strength."

Then, everyone went up to the fourth floor, which was the floor where the water army equipment was developed. Since there were not too many rivers in Bingzhou, the equipment on this floor was the least, namely some light leather armor and some improved small catapults.

After everyone arrived at the fifth floor, except for the guards, there were only more than ten people busy in front of a huge trencher, which seemed a little empty.

Zheng Hun pointed at the arm of the catapult. A thin young man said, "Lord, he is Ma Jun. The smartest person in our scientific research office, most of the improvements in mechanical and structural improvements are from his hands."

Yang Fan looked at it and saw the young man sitting there, writing something seriously, as if recording data. Even when Yang Fan and others arrived, he was indifferent.

Dian Wei was about to speak, but was pulled by Yang Fan. Everyone stood there, quietly waiting for the young man for half an hour.

It was the first time that Yang Fan saw Ma Jun. He was a talent that Jia Xu had recruited. As soon as he came to Bingzhou, he went directly to the scientific research office. Seeing that he had packed up the recorded bamboo and silk, Yang Fan laughed and said, "Is this a catapult? It's so big!"

Ma Jun was stunned when he heard this, then looked up and saw a group of people standing not far away staring at him. Zheng Hun, the head of the scientific research office, also stared at him with a smile on his face.

Ma Jun was born in poverty and had a stuttering. From childhood to adulthood, he had never seen such a scene. He was now timid and stuttering in front of Yang Fan, and could not say a complete sentence for a long time.

Looking at the restrained young man, Yang Fan patted his shoulder and signaled him not to be nervous. Then he smiled and said, "Little Ma Jun, I am well-known for your name. However, I have a lot of things to do today. I just saw a real person today. Good, do it well, tell us what this is?"

As soon as he talked about his business, Ma Jun suddenly became another person, and even stuttered instantly. He pointed at the trencher and said with a gaze: "Lord, this is my improved trencher, which can definitely help the lord win the battle!"

This catapult is different from the ordinary ones, and is different in size and structure.

Ordinary trench machines use the principle of leverage. Not only is the filling slow, but the operation is also very complicated. The destructive power is good, but the killing area is limited, so it is easy to be avoided by soldiers, and it is easy to be damaged. When moved, it is like a turtle crawling.

After fighting for so many years, Yang Fan only saw this guy on the city wall in the defensive battle.

If you attack a small city, the function of this thing is not as good as that of a bow or arrow; if you attack a large city, the stone will not be thrown up if it is big, and the stone will be small. Even if it is thrown up, it will be useless and can be blocked casually.

The most common one is that the city is covered with wet cowhides to resist the attack of catapults. It is conceivable that the lethality of a stone that can be blocked by cowhides is almost negligible.

Seeing that everyone showed discontent expressions, they seemed to be wondering why he wasted time on such things.

Ma Jun was anxious and explained: "Sir, this catapult is different from the ordinary one. It can be fired continuously. Whether in terms of firing speed or damage, it is several times stronger than an ordinary catapult!"

"What?" Yang Fan was shocked when he heard this and shouted directly regardless of his image: "You can send it continuously..."
Chapter completed!