Tanks are of great significance in modern warfare. From the day it appeared, the situation on the battlefield changed dramatically, and it officially entered the era of mechanization.

In order to win wars, human beings tend to increase their wisdom infinitely and unbridled. Immediately after the appearance of the steam tractor, the concept of an armored vehicle was proposed, that is, the installation of a steel casing and a machine gun.

The real qualitative change of armored vehicles is the change of wheeled drive to a more practical steel track, which can effectively break through trenches, barbed wire and fire points, and become the king of land warfare.

The characteristics of the sea monster are that it is dense, huddled, and has many vine nests, a typical positional pattern. The organic combination of firepower, off-road, and protection is a sharp weapon to break the positional war and complete the tactical breakthrough.

The Blackstone engine was used as the power plant, the sturdy orc black iron was used as the casing, and the modified machine gun was used as the fire device. The three cores of an armored combat vehicle are all available.

All Alice has to do is combine them organically.

The two toy cars running on the ground are the verification works. The first and the first one ever made, a single Blackstone engine, was composed of only gears, drive shafts, driving wheels, load wheels and tracks, and had no speed control system, not even a suspension system.

However, it can run, and that's enough!

Because of its ugly tin box, gurgling back and forth, Alice jokingly called it Beetle One.

The second car is more advanced, with improved tracks to the right width, twin Blackstone engines, and a suspension made up of delicate springs for faster running and more stability.

That is, Beetle Two, who made Luna scream and surprise.

"Alice, I've heard for a long time that you and Qin are making secret weapons, can't it be this thing?" Luna, who had visited the Beetle No. 2 show off her power, said with a smile on her face: "No cow, no horse, such a big iron lump can run on its own." ”

In front of a large oak table, Alice danced her hands, and the black iron ingots deformed in the air, forming a rotating shaft with gears, and slowly descended. She picked up the vernier caliper and carefully measured the data before she raised her head and smiled: "It's too small to be a secret weapon." ”

"Can it be used as a substitute for cattle and horses, used to transport goods, used to plough fields?" said Luna, who skillfully pried open the shell of the melon seeds with a delicate and neat little white fang.

"Yes, yes. Alice's magic power was at its best, she took out a silk scarf and wiped the fine sweat on her forehead, grabbed a handful of melon seeds from Luna's hand, and then gently pushed it up, sat on the edge of the table, and shook her two slender calves: "But this kind of is used for fighting, if it is used for farm work or something, it can be simplified." For example, replacing the tracks with wheels will be lighter. ”

"Fighting?" Luna stared at Beetle Two as she stared at the stoppage, "Can this little thing be used for war? How to fight? Crash into the Blaster (mine) and rush over? A swarm of beetles rushed over, blooming everywhere, spiraling into the sky, hahaha, that scene must be beautiful." ”

"Of course not...... Ah, wait. Alice was about to deny it, but suddenly she was stunned: "Yes, it can be filled with Bursters, and then rush into the crowd, boom~~~ Luna, you are a little genius." ”

"Hehe, I think so too. "Luna is not humble at all.

"It's fun, it's fun, but the cost seems a little too high. Alice thought carefully for a moment, then shook her head: "It can only be a one-time thing." The idea was to make it big."

"How big, a steel monster the size of a house?" Luna immediately became interested, "Can I sit in it and let it pull me around?" and then I can throw mines from the inside! Alice, you've managed to get my interest. ”

"It's not that big for a while, but it's okay to fit you in. Alice pointed to the made hinge, "Actually, it's just a vehicle, a vehicle that can be controlled by a human. As for weapons, you can imagine that guns can be loaded. ”

"Oh, oh. Luna laughed, "The small one is called a beetle, does that big one have a name?"

"I haven't had time to think about it yet......"

Luna winked, "I'm pretty good at names. The plants on the farm are all named by me. ”

"No problem, I will ask you to give it a loud and atmospheric name when the time comes. Alice nodded cheerfully in agreement.

Luna looked around, "By the way, what about Qin, why didn't you see him? I have something to ask him for today, there are still a lot of things on the farm waiting for me to go back and deal with." ”

Now the Black Stone Leader, everyone is preparing for the battle with all their might, even Luna, who has a jumpy personality, squatting on the farm all day.

"I went out just now, and there is something to discuss in the barracks? What is it?"

"Of course. Luna nodded, "About Veronica, she brought her students to help out on my farm yesterday and told me good news. She learned a new ability. ”

Veronica, as a four-star witch, is very quick to level up, and after [Psychic Projection] [Telekinesis] [Psychic Sigil], she comprehends four abilities.

"What ability?" Alice's eyes lit up, Veronica's ability was too important, especially the ability of the Mind Rune, which solved many problems.

"Backtracking. ”

"Backtracking?" Alice wondered.

"Well, how do I say that? I'll just say Veronica's description, she can apply a state to an object, and she can revert the object back to what it was before. Let's say, a jar, you break it. Then, after applying the backtrack, the jar will revert. ”

"Restoration?"

"Yes, those fragments will disappear into thin air, and then a jar will appear in its place, exactly like the previous one. So, Veronica calls it backtracking. ”

Alice groaned, "So, if you apply the backtracking state in advance, can you break it again, and will it be restored?"

"The same will be restored. She showed me how. Luna gives a definite answer: "In her description, the jar is fixed in its current state, and no matter how much you try to destroy it, it will always correct itself and return to its original state." "Soaring Chinese

"Auto-correction, fixed status!"

Alice grasped the key point, and her thoughts quickly diverged.

What if you replaced the canister with a bullet?

Apply a backtrack to the bullet in advance so that it remains unfired. When the hammer is fired, the projectile is fired, causing lethality, and then reverting back to the unfired state.

Alice knows all too well the importance of bullets, a gun without ammunition, just a burning stick.

But it is precisely the bullet that consumes a lot of copper, and the manufacture also consumes a lot of manpower and material resources, which has always been the biggest drawback of the Blackstone Collar.

Reminiscent of Veronica's natural ability, telekinesis, the ability to create bullets out of thin air, then this so-called backtracking skill is most likely the answer to solving the bullet puzzle.

This is too important for the Blackstone Lord, who is about to expedition to the Duchy of Vendon and cannot be effectively supplied!

"Veronica said, you and Qin must be very interested. She was supposed to come in person, just in time for me to come, so I told her. ”

"It's not just interested!" Alice's eyes lit up, "Luna, that's so important." Let's go, let's go and tell Qin now, he must be happier than me. ”

Not only was he happy, Qin Song, who heard the news, was about to explode with joy!

And such an operation?

Infinite bullets?

Infinite firepower?

So, he took Alice and Luna to the school in a hurry.

In Veronica's office, he witnessed a magical scene.

An ordinary piece of paper, with a retrospective state attached, can be broken in any way, such as folding, crumbling, shredding, or even burning. It's all going to reappear, exactly the same.

Of course, the backtracking state is time-limited, and the larger the item, the less the duration.

But it doesn't matter, with the magic level of a four-star witch, a piece of paper can last almost half an hour. And in this half hour, if you change to the magazine of the machine gun, it is enough to pour unimaginable firepower.

After being verified, Qin Song discovered that the official name of this ability was [Mind Backtrack], which applied a retrospective force field to a specified object, causing it to return to its original state after any changes occurred.

Another important indicator is the lookback interval. In the case of paper, for example, it takes about 1-2 seconds to recover after a state change.

In Veronica's description, the restoration interval is related to the volume and complexity of the object. The more complex and bulky it is, the longer the interval will be.

This is obviously too long for a machine gun with a rate of fire of hundreds of rounds per second, and it is not possible to form a sufficiently powerful firepower in a short period of time. There is also the problem that the flight and hit of the warhead, which also consumes time. If a backtracking occurs before hitting the target, the warhead will disappear out of thin air, which means that it will not hit.

That is, to achieve the expected unlimited firepower.

At least two major problems need to be solved, one is to shorten the replacement interval between bullets, and the other is to give the warhead enough flight time.

However, there is a contradiction between these two issues.

Faster backtracking equals a decrease in bullet flight time. The flight time is sufficient, the rate of fire decreases.

However, in another way of thinking, it cannot be used for machine guns, then it can be used for cannons. According to the principle of larger volume, longer interval, the more righteous the caliber, the longer it will take time. This is in line with the characteristics of the slow rate of fire of the cannon and the long firing range, and the warhead has sufficient flight time.

"Veronica, have you had a lot of classes lately?"

When Harald returns from the sea trials, the time for the expedition will come, and the Duchy of Vendône will not last long. Until then, solving the problem of ammunition is too critical.

To overcome this problem, Veronica's cooperation is required.

Veronica recognized the importance of this ability, and was well prepared, looking at Luna with a smile. Luna, who was on the side, immediately raised her hand: "Qin, I can substitute for class!"

"You?"

"Huh?" Luna rolled her eyes triumphantly, "I know everything, and the Hall of Wisdom has given me knowledge." ”

"I have a ready-made lesson plan here. Veronica picked up a stack of written lesson plans from her desk.

"You already guessed?" Alice realized.

Veronica nodded: "I made arrangements in the morning, even if you don't come, I will go to you in person in the afternoon." ”