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

For the next three days, Hill 597.9 fell into an eerie silence.

The US military stopped charging and instead used heavy artillery to bombard the enemy intermittently, or simply used aircraft to drop incendiary bombs.

But He Yuzhu had anticipated this move.

He designed the tunnel interior as an ultimate "chemical and smoke-proof" fortress.

The ventilation openings were hidden in extremely concealed crevices in the rocks, and were further reinforced with a simple filter layer, charcoal, and damp cotton blankets.

The billowing toxic smoke from the incendiary bombs couldn't penetrate even a fraction of it.

Not only that, He Yuzhu also directed his soldiers to dig out a water storage pool and an ammunition depot deep in the tunnel, and even a five-square-meter "field hospital".

Compared to other fortresses still exposed to the elements in their caves, this place is practically a five-star hotel!

But He Yudu was not satisfied.

"Taking the hits passively is not my style."

Deep inside the tunnel, He Yuzhu sat at a table made of ammunition boxes, engrossed in disassembling a Mosin-Nagant rifle.

Zhang Dabiao, standing nearby, looked completely bewildered.

"Old He, what new trick are you up to this time? You took a perfectly good gun apart and turned it into a bunch of parts?"

He Yuzhu didn't even look up; he was holding a file in his hand, carefully sharpening the gun mechanism.

"The original parts are too inaccurate and have too much barrel resonance, I need to get this one!"

Relying on his [Proficiency in Gun Modification], he quickly made the barrel free-floating and used the blueprints given by the system to grind a few simple lenses on the spot, managing to assemble a 4x scope.

Half an hour later.

A slightly grotesque, modified Mosin-Nagant lay quietly on the table.

"Come on, I'll take you hunting."

He Yuzhu, carrying his gun, walked towards a firing position at the very front.

This firing position is extremely tricky, located in a natural crevice beneath a boulder, offering a wide field of vision that can see an area of ​​800 meters in front of the US military position.

At that moment, a few hundred meters away, several American soldiers were sitting on the hood of a jeep, smoking, and some even took off their shirts and sunbathed, their behavior extremely arrogant.

In their view, the Volunteer Army's homemade guns were just sticks for burning, and this distance was absolutely safe.

He Yuzhu set up his gun, adjusted his breathing, and remained as steady as a rock.

The crosshairs gently caught on an officer who was opening a can of luncheon meat.

Wind speed: Level 3.

Humidity is moderate.

Distance: 780 meters.

The [King of Soldiers Engine] instantly provides ballistic correction parameters.

"Bang!"

A crisp gunshot rang out, not as noisy as machine gun fire, but it echoed exceptionally clearly in the valley.

The U.S. military officer had just brought the luncheon meat to his mouth when his head suddenly slammed open like a watermelon being smashed by a hammer, spraying red and white contents all over the face of his comrade next to him!

"Enemy attack! Sniper!!"

The US military position instantly erupted into chaos!

But before they could find cover—

"Bang!"

Another sound.

An American soldier who was about to climb the machine gun turret suddenly burst out of his chest with a cloud of blood and fell straight down like a tattered sack.

Zhang Dabiao stood to the side holding binoculars, his mouth agape, completely dumbfounded.

"My goodness... 800 meters away? One shot, one kill? Old He, are you a god descended to earth?!"

He Yuzhu pulled the bolt, ejected the shell, and loaded the gun.

The movement was so fast it was like a phantom, full of the art of death.

"Zhang Dabiao".

"arrive!"

"Choose ten of the best marksmen from the whole company. They won't have to do anything else. They'll just be my sixth men and shoot from the shadows."

As He Yuzhu aimed at his third target, he calmly said, "I'm going to make these Americans so afraid they won't even dare to stand up straight when they pee!"

This was the prototype of the famous "sniper and cannon movement" in history.

However, in He Yuzhu's hands, this tactic was detonated prematurely, and it was ten thousand times more lethal!

The next two days became a nightmare for the American troops on the other side.

Anyone who dares to stick their head out of the trench, even if it's just to grab a can of food, will inevitably be met with a precise bullet in the next second.

The American troops even had to relieve themselves in the trenches, making the entire position stink. Morale plummeted, and everyone's spirits collapsed.

He Yuzhu, on the other hand, became a top-notch instructor in the tunnels.

"Keep your breathing steady, keep your heartbeat slow, treat the gun like your wife, and be patient."

"Hit and run, don't be greedy, we're playing for thrills!"

Under his tutelage, Zhang Dabiao and the others' marksmanship improved by leaps and bounds. Although they couldn't reach He Yuzhu's abnormal accuracy beyond 800 meters, they were still able to hit their targets every time at a distance of 400 to 500 meters.

Having snipers alone isn't enough; what if they sneak up in at night?

Using his advanced civil engineering knowledge, He Yuzhu devised another type of "chain mine".

He had planted trigger devices along the routes where the US military might launch a surprise attack. These devices were linked by tiny tripwires. If anyone triggered them, a bell in the tunnel would ring.

The soldiers didn't even need to show their heads; they simply pulled the rope taut from inside the tunnel.

"boom!"

One explosion and a whole area is wiped out!

A week later.

On Van Fleet's desk lay a casualty report that sent his blood pressure soaring.

"Non-combat casualties...three hundred?"

"Just because of drinking water, going to the toilet, or sunbathing?"

Van Fleet slammed the report to the ground, roaring like a madman, "These are the groundhogs you're talking about? They're a bunch of Grim Reapers crawled out of hell!"

Meanwhile, inside the tunnels at Hill 597.9.

He Yuzhu was leisurely eating the luncheon meat he had captured, listening to the wonderful notification sound in his mind.

[Ding! The host has activated the "sniper tactic" and successfully killed an enemy colonel, causing widespread panic among the enemy troops!]

[Check-in successful! Location: Hill 597.9, soaked in blood!]

[Rewards: Advanced Camouflage (Chameleon), Basic Radar Principle Diagram, Special Alloy Smelting Notes!]

Upon hearing the last two rewards, He Yuzhu paused for a moment.

Radar? Alloy?

This is no longer a skill for killing enemies on the battlefield.

These are... skills for doing scientific research!

He looked out at the dark night sky outside the tunnel, his eyes brighter than ever before.

This reward... it really opens up a whole new world of possibilities!

It seems that the small Shangganling Ridge can no longer hold him.

A larger and more magnificent stage awaits him to conquer!