Siheyuan: I, Shazhu, started out as an army and became a general.

At the U.S. frontline command post, Van Fleet looked at the battle report, almost crushing the pipe in his mouth.

"Two rounds of saturation bombing, two battalions charging, and all they got were a few hundred corpses? Were the people on the mountain Chinese or demons from hell?"

The adjutant, sweating profusely, reported: "General, the reconnaissance plane reports that the mountain surface has indeed been flattened."

"But...but the Chinese dug tunnels on the reverse slope, and as soon as the artillery fire stopped, they crawled out from underground!"

"A tunnel?" Van Fleet sneered, his eyes flashing with murderous intent. "Then blow up the entrance! Send in engineers and use high-yield C4 to suffocate those damned rats inside!"

.....

Hill 597.9.

Zhang Dabiao was leading his men, laboriously carrying the newly delivered supplies.

"Old He, what is this grayish-brown paste? Why did we have to go through all that trouble, having them grind stone powder and send it to us overnight?"

Zhang Dabiao watched as He Yuzhu directed the soldiers to apply a dark gray paste to the tunnel entrance and key support pillars, his face full of question marks.

He Yuzhu held a spatula in his hand, his movements as skillful as an old bricklayer.

"This is called concrete."

"Cement?" Zhang Dabiao curled his lip. "I know that stuff. It's crispy, it'll crumble in one shot."

"This isn't your ordinary cement." He Yuzhu didn't even look up, but he knew perfectly well: this was high-explosive concrete produced by the system, ten times harder than ordinary military concrete, and it only took two hours to solidify, with blast resistance comparable to that of a nuclear bunker.

"Alright, stop joking and get to work. Especially the entrance, smear it thickly, this stuff is our lifeline."

Two hours later.

The slurry dried completely, revealing a bluish-gray color with a metallic sheen.

Just then, the sentry at the front shouted at the top of his lungs, "The Japanese are coming! This time they're not carrying guns, they're carrying explosives!"

Zhang Dabiao peeked out and saw dozens of American engineers, under the cover of infantry, crouching low and sneaking towards the cave entrance.

"Damn it, they're trying to blow up our bunker entrance! Machine guns, get ready!"

"Don't rush." ​​He Yuzhu grabbed Zhang Dabiao's gun barrel, a playful smile curving his lips. "Let it get closer and let them blow it up."

"What?!" Zhang Dabiao's eyes widened like saucers. "Old He, are you crazy? If the cave entrance collapses, we'll be living coffins!"

"I said let them blow it up." He Yuzhu's voice wasn't loud, but it carried an undeniable chill. "Perfect, let's sharpen the new material."

Zhang Dabiao gritted his teeth, his hands trembling, but in the end he still chose to believe in this man who had created miracles time and time again.

"All company, listen up! Find a place to hide! Cover your ears and open your mouths!"

U.S. engineers successfully located the entrance to the cave.

Looking at the strangely shaped bluish-gray opening, several sappers quickly piled up a full fifty kilograms of C4 explosives.

That dosage is more than enough to blow up a small building, let alone a hole.

"Fire in the hole!"

The American engineers lit the fuse and scrambled back.

"BOOM—!!!"

A deafening roar shook the entire mountain, sending rocks flying and dust instantly obscuring the sky.

Zhang Dabiao felt as if his internal organs were about to be shattered, and only two words came to his mind: "Sent."

Oh no, I'm really going to be buried alive now.

The American commander down the mountain lowered his binoculars and revealed a cruel and triumphant smile: "This is what happens when you go against the great United States."

however.

As the dust and smoke gradually dissipated.

On the battlefield, everyone was stunned.

The US military commander's smile froze on his face; his expression was worse than if he had swallowed a greenbottle fly.

Inside the tunnel, Zhang Dabiao slowly opened his eyes. When he saw the situation at the entrance, his chin almost snapped and hit his foot.

The bluish-gray hole stood there motionless.

Forget about a landslide, you can't even see a crack!

Only the surface layer of gray skin was blown away, revealing a deeper, harder bluish-black color underneath, which gleamed with a strong sense of mockery in the sunlight.

"This...this is a tortoise shell that has come to life, isn't it?" Zhang Dabiao stammered, his worldview being slightly shaken.

He Yuzhu calmly patted the dust off his clothes.

Anything produced by our system is guaranteed to be of high quality.

This formula contains special adhesives and polymers; a mere C4 is only good enough to scratch an itch.

He picked up his rifle, pulled the bolt, and aimed through the still incredibly sturdy firing port at the American engineers who were still standing there in a daze on the hillside.

"It seems the experiment was a success."

"Since the door isn't closed, please, guests, try our peanuts."

"Bang!"

A U.S. military engineer's head exploded, sending a spray of blood flying.

"beat!"

Zhang Dabiao reacted instantly and roared with ecstatic joy.

Inside the tunnel, the dormant flames erupted violently once more!

This time, the surviving US troops completely collapsed.

This was not a battle at all; it was a one-sided massacre, a psychological blow!

How can we fight a war when even C4 can't break through a turtle shell?!

As the American soldiers fled down the mountain in a panic, crying and begging for mercy, He Yuzhu heard that familiar and pleasant notification sound in his mind.

[Ding! The host has used advanced technology materials to shock the enemy army, gaining the achievement "Indestructible"!]

[Rewards: Master-level Weapon Modification Skills, High-Precision Optical Scope Blueprint!]

He Yuzhu touched his chin.

Simply being able to defend against it is not enough.

Next, let these Americans experience what it truly means to "die the moment you step outside"!