During the combat engineers' attack, at the 53rd Division's position, everyone's eyes were fixed on the towering mountain hundreds of meters away. In front of them was not just one mountain, but an endless series of mountains. The U.S. military not only built fortresses against the mountains, but also built a large number of trenches.

Trenches, barbed wire and machine guns had stabilized the battle lines on the European battlefield, and now, trenches, barbed wire and machine guns were still there before their eyes.

The officers and soldiers standing in the trenches held their weapons ready to charge at any time, and the signalman carrying the pigeon cage stared at the officer beside him. On the battlefield filled with smoke, the combat engineers continued to use blasting copper to clear the barbed wire, and soon several narrow passages were blasted out.

As the artillery fire slowly extended to the fortress, a piercing copper whistle sounded in the trench. The moment the whistle sounded, the first wave of assault troops jumped out of the trench like a tiger out of a cage. The soldiers, crouching in a dispersed formation, followed the artillery fire and moved towards the American defense line on the mountain. This was the unique artillery follow-up tactic of the imperial army. Although after the Battle of Brazil, the imperial army only had the experience of "armed march" in Peru, the vast land of South America was the empire's military training ground, where the imperial army honed new tactics.

Even in the past year, the Imperial Legion has used the battlefield as a training ground, advancing steadily across the vast land of North America and honing in on new tactics bit by bit.

After the first wave of assault troops attacked, the second wave of assault troops, consisting of three regiments, followed immediately.

Under the cover of artillery fire, the assault troops approached the outer trench at the foot of the mountain. The American soldiers who survived the artillery fire in the outer trenches, upon discovering the assault troops of the Imperial Legion, launched a fierce attack with machine gun and rifle bullets. The dense bullets swept down like a rainstorm. The bullets passed by the soldiers, and from time to time, some soldiers in the charging troops suddenly fell to the ground and never stood up again.

A sergeant holding a submachine gun rushed to the front. When the U.S. troops started to counterattack, he rushed behind a half-man-sized rock and used his submachine gun to suppress the firepower of the U.S. troops. Although the range of the 10mm submachine gun was limited, its powerful firepower could still play a suppressive role within a distance of 200 meters.

Moreover, compared to machine guns, the Imperial Legion had more submachine guns - each squad had two submachine guns, and the assault troops had two more submachine guns per squad. Relying on the powerful firepower of submachine guns, the assault troops were not at all inferior to the U.S. military in the shootout.

"Shoot alternately at the muzzle..."

The sergeant shouted as he fired at the firing holes of the machine gun bunkers. When a magazine of bullets was empty, another soldier immediately continued to suppress the fire. In this way, they used short bursts of fire to block the enemy's hidden cave entrance and firepower point, making it impossible for the enemy to fire, and covering other comrades to charge.

While the enemy's firepower point was suppressed, the assault squad had already circled to the left side of the trench and occupied a forward firepower point that had been destroyed by artillery fire. They approached the flank of the resisting U.S. troops, and the U.S. troops who were desperately fighting back were completely unaware of their presence.

Following the communication trench and approaching within twenty meters of them, Li Guoquan stuck his head out of the trench and took out a one-kilogram heavy grenade from behind. After pulling the fuse, he threw it out with all his might.

A few seconds later, accompanied by a loud explosion, the American troops who had been resisting stubbornly suddenly stopped firing. Taking advantage of the time, the soldiers who had been shooting at the American troops immediately rushed forward and occupied the American trenches. Before they could breathe a sigh of relief, thirteen or fourteen American troops with rifles and shining bayonets rushed out from another stronghold and pounced on the trenches that had been occupied by the imperial soldiers.

The sergeant had just jumped into the trench and had just stood firmly when he saw groups of American soldiers rushing towards him. He raised his submachine gun and started firing at the rushing American soldiers.

The rapid sound of gunfire instantly suppressed other sounds in the trenches. The powerful stopping effect of the 10mm semi-jacketed bullets was fully demonstrated here. The American soldiers who were hit by the bullets were knocked to the ground, and the expanded and deformed bullets directly opened fist-sized bullet holes in their backs. The American soldiers who were hit were either dead or disabled, and they fell down instantly.

But in just one encounter, the sergeant emptied a magazine, and just as he emptied it, another submachine gunner raised his gun and fired a burst of shots. When the gunfire stopped, the dozen or so American soldiers who were shouting to kill all fell in a pool of blood.

The powerful firepower of the submachine gun was fully utilized in the narrow trenches.

"Attack, attack..."

Under the leadership of the sergeant, the soldiers immediately attacked deep into the trenches. When encountering the enemy, they would often throw a heavy grenade first, and then rush over to rain bullets on them while the enemy was dizzy.

When they charged and encountered the enemy's permanent fortifications, they would rush close and directly stuff one-kilogram heavy grenades into the firing holes. In the violent explosion, the seemingly solid permanent fortifications were destroyed one after another.

"Grenade, grenade..."

At the corner of the trench, staring at the stronghold in the distance that was spitting flames wildly, Li Guoquan shouted loudly to the back, saying that he had run out of grenades long ago.

A grenade was stuffed into his hand, and he shouted as soon as he picked it up.

"Aggravated, aggravated..."

"No more, used up..."

"Strap the grenade with a rifle belt..."

Soon, a cluster grenade consisting of five grenades was ready. Holding the cluster grenade, Li Guoquan crawled under the firing hole of the fortress and then pulled the fuse.

"1, 2, 3..."

When he counted to "three", Li Guoquan threw a grenade into the fort. When he leaned forward to throw the grenade, he could even see the astonished eyes of the American soldiers in the fort.

Accompanied by a violent explosion, a cloud of smoke spewed out from the fortress's gun port.

“This is the first time…”

Li Guoquan didn't have time to think about this. After taking down the fortress, the soldiers rushed forward in one go, marching towards a small hill on the mountainside, sweeping across the American troops hiding in the bunkers and those exposed to the public, launching a violent attack.

Along the way, all the soldiers fought and charged fiercely, and the fierce and sharp offensive was beyond the imagination of the Americans. They had never thought that the attack could be launched in this way. After all, their minds were still stuck in the era of the Civil War.

Even those American soldiers bravely rushed forward and tried to stop the enemy's attack with bayonets and rifles. However, they were faced with the powerful firepower of submachine guns, and under the fierce firepower, they became dead souls under the gun.

Times have changed, but some things will not change. War is a mutual fight and no side can gain the upper hand. The U.S. military will not passively take a beating. As the artillery cover stopped, the mountain wind blew away the smoke. When the smoke dissipated, the attacking forces were exposed to people's sight.