This matter really made Zhang Wanhe calculate correctly.

When Zhang Wanhe went to the command center to find the chief, the chief still discussed tunnel warfare with the chief of staff with an unfulfilled desire.

"These ideas raised by Xiao Dongbei are a little different!" The leader sighed as he looked at the meeting minutes: "If this can be combined with mines, terrain and fortifications, even if the Japanese have several times the strength of their troops, it will not be easy to completely chew off our high ground!"

"Yes!" The Chief of Staff agreed: "After the enemy has occupied the surface position, we can hide in the tunnel and continue to fight with them. Then, the enemy faces double pressure from the ground and underground. As soon as the underground troops drill out, they will immediately fight hand-to-hand combat with the enemy. At the same time, our ground troops will take advantage of this time to press on..."

The chief and chief of staff are both old Red Army soldiers and they have rich combat experience.

I didn’t know about tunnel warfare and tunnel warfare before, but now I know that I just need to rely on my imagination to reasonably deduce some combat methods that are beneficial to the Eighth Route Army.

As the leader said, Xiaodongbei's idea was like opening the door to a new world. After crossing this door, he found that there were many novel and interesting things waiting for them to dig.

Therefore, when Zhang Wanhe hurried to the command center to make a request, the leader refused without thinking: "Any other request is OK. If you want to have a small Northeast, then you will be free of talks. There is nothing more important than tunnel warfare now!"

The leader knew Zhang Wanhe and knew that he had always wanted to transfer Xiaobei to the arsenal to help them build equipment. This request at the moment must be related to Xiaobei.

Zhang Wanhe was not in a hurry. He smiled "hehe" and said, "Chief, listen to me first. If you don't give up Xiaodongbei, I will turn my head and leave without saying a word!"

"Oh?" This aroused the interest of the leader. He put the meeting minutes aside, put the waist up and raised his chest to look at Zhang Wanhe, and put on a posture of putting the horse over and laughed: "I want to see what other ecstasy soup you, Lao Zhang, can give me, tell me!"

The leader’s idea is very simple. No matter what Zhang Wanhe says, he will only have the word “no”. What else can Zhang Wanhe do?

Of course, Zhang Wanhe knew what the leader was thinking. He raised his head and asked as if he was challenging: "Chief, do you remember what I told you about the problem of the high scrap rate of making artillery shells and grenades?"

"It seems like this is happening." The chief thought for a while, then nodded and said, "You seem to say... the arsenal cannot produce large quantities of shells and grenades because of this."

Zhang Wanhe nodded, then stopped talking, and just stood there with a smile and looked at the leader.

The leader was confused for a while, and after a while he said "Oh" and said with a smile: "Do you want to transfer the Northeast to solve this problem? There is no hurry to do this, how can you find a way for a while..."

Zhang Wanhe interrupted the leader: "If I really didn't think of a solution, can I come to you?"

The leader's eyes suddenly lit up: "Is this true? Is there a way?"

Zhang Wanhe nodded: "Xiaodongbei thought of another resilience technology. Am I worried that he had missed something? It won't work without him. Look, Chief..."

"No problem!" The chief leader waved his hand and said, "Let him do retardation technology first!"

Of course, the leader knew that this toughening technique was extraordinary, and it took only a few days for a furnace of shells to be burned out, but authentic fortifications were not completed so quickly. You can tell which one is more important.

The chief of staff next to him interrupted, "We can do both ends together. In the past few days, Xiaobeidong first develops toughening technology in the arsenal. We will first organize personnel to dig tunnels. We will dig according to our own ideas. At that time, Xiaobeidong will see if there are any problems before modifying them. Anyway, digging tunnels is mostly physical work."

"It's right!" The chief nodded and said to the chief of staff: "I'll leave this matter to you!"

"Yes, I guarantee to complete the task!" The Chief of Staff took on this task simply, and he was also very interested in the new thing about tunnel warfare.

So Wang Xuexin once again struggled with oxygen-free toughening in the arsenal.

Not to mention, Wang Xuexin came in handy on the first day...

Zhang Wanhe asked someone to put in a few large iron boxes, just as Wang Xuexin said, laying a layer of refractory bricks and then a layer of shells, and the shells were also filled with refractory bricks and crushing.

The other box is filled with the grenade shell, and the same operation is performed.

Before he wanted to cover the box, Wang Xuexin stopped it in time and said, "Wait a minute... I seem to remember saying that, and a layer of broken iron must be laid before covering the box cover."

In fact, this is not "seemingly", it is simply a system prompt: "To prevent oxygen from entering through the gap, please lay a layer of broken iron."

Wang Xuexin secretly said that this million military industrial coins were worth spending, and it also "monitored the teaching and meeting in a timely manner."

Su Xin said "Oh" and said, "If oxygen penetrates into the iron box from the void, they will be absorbed by these broken iron blocks!"

Well, this Su Xin must be in the same group as the system.

Wang Xuexin was a little suspicious whether Su Xin had a system in her head.

Others didn't understand this, but Wang Xuexin and Su Xin said so, so they followed. So they hurriedly laid broken iron pieces on the top layer, covered the box cover, sealed it with clay, and then burned it in the stove.

The temperature is also controlled at around 950 degrees.

Number and register data in batches as before.

This time, the furnace is not as nervous as the first time, because the master has already gained experience in looking at the furnace and has skills in temperature control. For example, I specially built a few small iron bowls to put them in the furnace, so that if the silver blocks are melted, they will not be lost and can be used repeatedly with confidence.

But perhaps out of caution, Zhang Wanhe still divided several directors into groups to stare at them.

Wang Xuexin was very coincidental and got a group with Su Xin.

It was not until this time that Su Xin noticed that the rifle on Wang Xuexin's back was indeed different from before, with an additional scope.

"Is Hardware true?" Su Xin looked at Wang Xuexin in confusion.

"What?" Wang Xuexin was a little confused.

"Hardware said you were injured!" Su Xin turned her gaze to the record book in her hand, pretending to be recording something.

"Can that be called injury?" Wang Xuexin smiled and raised his head: "It's just a little bit of skin!"

Su Xin was a little helpless. You did get a little scratch, but this bit of skin was rubbed out by bullets on your forehead. If you were a little bit off...

Su Xin didn't dare to think about it any more.

Wang Xuexin was roasting the fire in front of the stove as if nothing had happened. While rubbing his hands, he said without saying: "You have never seen those who are really injured. Broken hands and feet are considered light. They are kept on the spot, and those who are unconscious will send them to the headquarters..."

When he turned his head and saw that Su Xin's face was a little wrong, Wang Xuexin hurriedly stopped his mouth: "Forget it, it's not good to scare your girls' home if you say too much. In short, don't always think about going to the front line. Hardware is scared!"

Su Xin didn't say a word.

She is not a hardware product, so she would not want to go to the front line without any trouble.
Chapter completed!