Inside the train station outside Li Xin's headquarters, this is a gathering place for the Qin army's materials and a place for soldiers to transport.

"Sir, if we reach Dawan, how can we solve the defense problem?" the staff officer said.

"Furthermore, we only have one staff group, carrying at most two companies, which is very unfavorable for us." The staff officer said worriedly.

"So, we need a secret weapon. Moreover, the effect of this secret weapon is very powerful." Li Xin said with a smile.

"Woo." At this moment, a train whistle sounded. Then accompanied by the train's "click, click." The sound came.

"This is?" The staff member was surprised to see the train behind the white smoke. It was not a train, to be precise, it was an armored monster.

"Iron-clad train?" the staff officer cried out in surprise.

"Yes, the armored train, this is our secret weapon. This kind of weapon will give the rest people a great surprise. I think they will be happy and frightened when they see such a situation." Li Xin smiled Speaking of.

The iron armored train is Li Xin's secret weapon. For such secret weapons, Li Xin is extremely confidential. It can be said that this weapon is a crazy killer.

"There are three two-and-a-half-inch and a half-caliber rate-of-fire cannons, and one three-inch-caliber cannon. It is equipped with seven 1.50 heavy machine guns. In addition, there are many shooting holes, and the middle of the train can be lengthened by three carriages. This is the case. Here, it’s easy to transport a battalion of troops. The most important thing is that we can store a large amount of ammunition with the troops of two companies. As long as we follow the railway line and keep the rear railway line safe, everything is okay." Li Xin smiled and patted the staff's shoulder.

"In this way, we will be foolproof." The staff officer said.

"Okay. Let's get on the armored train." Li Xin said with a smile. Qin has long had iron-clad trains, but they could not be effectively deployed in major theaters, because many areas did not have railways, and the construction of railways would cost a lot of money. No country can afford such a large cost.

But Dawan is different. They have rich mineral resources. In order to be able to transport these mineral resources quickly, they built the Dawan Railway, which is Dawan’s financial source and their lifeline. In this regard, Dawan has continuously increased its investment in this railway. They plan to further widen this railway next year to more than double the transportation capacity of this railway, because the price of copper ore is still rising. For them, this is an excellent opportunity to make a fortune.

Therefore, with the existence of this railway, the State of Qin can use the iron-clad train in the direction of Dawan. Qin’s iron armored trains did not use large-scale welding technology, because the technical cost was relatively high. They used riveting methods. A large number of rivets were used to fix the iron armor on it. This method was very dangerous because there was a share. Experimental data shows that once a heavy artillery bombards it, the iron armor may withstand the opponent's artillery attack and provide some protection, but the rivets that are shaken will fly around and become a kind of bullet to kill the internal members. However, Qin Jun believes that this is an excessive worry, because there is no weapon that can pose a great threat to the armored train. Not only that, they also believe that the use of other technologies, such as welding technology, is for them. The cost control of rivets has great disadvantages. They can still accept the cheap technology of rivets. It is unbearable for them to use welding technology, and the use of casting technology also increases the cost. Therefore, rivet technology is their best Good technology.

State of Zhao, Handan.

Zhao Jun is in a secret weapon testing ground.

"General, give it a try?" An engineer excitedly handed a new bolt-action rifle to Li Mu. Zhao can design and manufacture this rifle by himself. They call it the Zhao-style one-type rifle, which is a kind of rifle. A single-shot fixed ammunition rifle without a magazine. All parts are produced by Zhao Guo himself. The barrel uses a special barrel smelted from chrome-nickel ore imported from Qin State. This barrel can withstand 10,000 shots of gunpowder bullets. This is quite remarkable.

With Zhao’s understanding of chemistry, especially in metallurgy, they learned about the existence of chromium-nickel ore. Unfortunately, Qin’s control of such minerals is extremely strict. Zhao can only continuously import from Qin. To meet their needs, they are also actively looking for it. Unfortunately, China is already a country lacking chromium and nickel. The location of Zhao Guo further contributed to this situation.

"Is the target a little far away?" Li Mu picked up the rifle and took aim, but he found that the target was a little far away, far beyond the distance of five hundred steps. The black powder bullets couldn't reach that distance at all.

"Sir, not far, this distance is just right." The engineer on the side said with a smile.

"Well, since you said you can hit this far, I'll try it." He pulled the bolt, and aimed at it.

"Bang." After aiming for a while, Li Mu pulled the trigger.

"It's hit." The red flag was shaking in the distance. The engineer said.

"Really able to hit this far?" Li Mu said excitedly. He knew that at this distance, only Qin's special bullets could do this, but now they can do it themselves.

"I will try again." Li Mu said excitedly. Then aim and shoot again.

"Tell me, what kind of bullet is this?" Li Mu curiously put down the rifle in his hand and asked.

"Sir, this is the new type of gunpowder provided to us by the Koreans. It is a strip of gunpowder with the same power as Qin's bullets. We have repeatedly tested and the data is consistent." The engineer said to Li Mu.

"That's great. Did their professor give us the technique?" Li Mu asked.

"This, not yet, but they need more steel technology and metallurgical data, we have provided them, and they are going to tell us the formula, but we need to go to the south to build a steel plant for them. "The engineer said.

"Well. We have to get such technology. In this way, the artillery technology and rifle technology can rise to a large extent, and the air defense problem will be solved." Li Mu looked at the distance. The target, the distance of five hundred steps, this distance far exceeds his imagination, if there is such a bullet, what will happen? Li Mu felt very happy when he thought of it.