Too many female prisoners, a special forces soldier transmigrates and marries wildly.

Their steps were synchronized, their eyes were cold, and they exuded a chilling murderous aura.

"The Black Wolf Guards..." A knowledgeable veteran on the city wall gasped. "They're Asuda's personal guards! This is troublesome!"

Lin Feng also noticed this special team. He knew that the real test was about to begin.

The Yan army was exhausted and their arrows and stones were almost used up. How long could they hold out against this fresh force?

"Brothers!" Lin Feng shouted, his voice echoing across the East Gate.

"The last elite Di Rong troops are coming! They want to tear down our city walls with their sharpest claws! Are you afraid?!"

"We're not afraid!" the surviving Yan soldiers shouted back, their voices hoarse but filled with determination.

"Good! Let them see what the backbone of the Yan army is! As long as we live, the city will stand!"

"As long as we live, the city will remain!"

With a roar, the Black Wolf Guards began their charge.

Unlike ordinary Di and Rong soldiers who scattered and howled, they approached silently, like a moving steel wall.

Arrows struck their heavy iron shields, sending only a few sparks flying. Bouldering stones were nimbly dodged or blocked with their shields.

Soon, they reached the city walls, erected even stronger ladders, and began to climb. Their movements were swift and steady, their teamwork impeccable, far surpassing that of the previous Di and Rong soldiers.

"Spears! Hold the line!" Han Tao roared, leading his spearmen forward.

With a loud clang, a Black Wolf Guard leaped onto the city wall, his curved blade cleaving through the air, splitting a Yan soldier's spear and helmet in two! Blood and brains splattered everywhere!

"Die!" Lei Bao roared and pounced, smashing his iron hammer at the Black Wolf Guard.

The Black Wolf Guard raised his shield to block, and with a loud "clang!" the shield shattered. The Black Wolf Guard was also shaken and staggered backward, but then two more Black Wolf Guards leaped up, their curved blades flashing as they attacked Lei Bao.

The city walls instantly erupted into an even fiercer battle.

The Black Wolf Guards were indeed formidable, with individual combat strength far exceeding that of ordinary Yan soldiers; it often took two or three men to barely hold off one of them.

The defensive line was constantly breached, and the casualties of the Yan army increased sharply.

A fierce glint flashed in Lin Feng's eyes. This couldn't go on any longer! He brandished his long sword, ready to personally plug the most dangerous gap.

Suddenly, out of the corner of his eye, he caught a glimpse of a faint, blue-green light, different from the firelight of battle, flashing by in the direction of the west courtyard of the city.

What was that? He felt a chill run down his spine, but he had no time to think about anything else.

"Yan Qing! Follow me!" Lin Feng shouted to Yan Qing, who was fighting a Black Wolf Guard not far away, while he rushed towards a section of the city wall that had been breached by three Black Wolf Guards and where Yan soldiers had been almost all killed or wounded.

Upon hearing this, Yan Qing used his twin swords to force his opponent back, and his figure moved like lightning, closely following Lin Feng.

Before Lin Feng arrived, his blade was already there! The blade flashed like a bolt of lightning, aimed straight for the neck of the leading Black Wolf Guard!

The Black Wolf Guard reacted with lightning speed, parrying with his blade. "Clang!" Sparks flew, and Lin Feng felt a slight numbness in his arm. The Black Wolf Guard's strength was astounding! But his attack wasn't over yet. With a flick of his wrist, the blade slid down along the opponent's curved sword, aiming straight for his wrist!

The Black Wolf Guard was horrified and released his grip, his curved blade falling to the ground. Lin Feng took a step forward and kicked him off the city wall.

Two more Black Wolf Guards roared and pounced. Lin Feng unleashed his footwork, dodging and weaving within the limited space, his blade flashing like a screen of light, deflecting both attacks. Yan Qing arrived, his twin blades striking like venomous snakes, attacking from the flank and instantly killing one of them.

But the Black Wolf Guards were simply too numerous, constantly surging forward. Lin Feng and Yan Qing, though fierce and brave, were also entangled and unable to break free. The other defensive lines were even more precarious.

Just as the East Gate defense line was on the verge of collapse—

"boom!!!"

A deafening roar, far more muffled than any previous impact, seemingly emanating from the depths of the earth, suddenly came from the rear of the Di Rong army formation, in the northeast direction!

Immediately following was a tremendous earthquake, accompanied by the terrified neighing of countless warhorses and the panicked shouts of the Di Rong soldiers!

What happened? Both sides were startled by the sudden loud noise and tremor, causing them to slow their attacks.

Taking advantage of the opportunity, Lin Feng forced back the Black Wolf Guard in front of him with a single slash, leaped onto the rampart, and looked in the direction from which the loud noise came.

About a mile behind the Di Rong army formation, a large area that was just a barren snowfield during the day had now collapsed, revealing a huge, dark crater!

At the edge of the pit, soil and gravel continued to slide down, and scorching air and a pungent sulfur smell wafted in with the wind! Dozens of Di Rong cavalrymen fell into the pit along with their horses, their screams swallowed up.

The Di and Rong troops on the outer perimeter were thrown into chaos by the sudden "ground collapse." Their warhorses were frightened and ran around in all directions, and the entire rear army was in disarray!

It's a mine! It's the area in the direction of Ghost Cry Forest that might contain silver and copper and has an underground river! Could it be... that an underground river or gas (called "yin fire" or "poisonous miasma" in ancient times) erupted, causing the collapse?

Lin Feng instantly recalled the mineral vein map Xie Wanqing had presented, along with the "underground river" and "potentially toxic gases from associated minerals" she had mentioned.

Could it be... that this is not a coincidence?

He turned sharply, looking towards the west courtyard of the city. That fleeting blue-green light...

"Heaven is on my side! That brat Di Rong has been punished by heaven!" Lei Bao roared with ecstasy from afar.

"Brothers! Kill! The Di Rong's rear guard is in disarray!" Han Tao also reacted and shouted hoarsely to boost morale.

This sudden "natural disaster" completely disrupted the Di Rong's offensive.

With a fortified city in front that was difficult to capture and land suddenly collapsing behind them, the morale of the army immediately wavered. Asuda was both shocked and furious, shouting repeatedly in an attempt to stabilize the situation.

But how could the Yan army let go of this golden opportunity?

Under the leadership of Lin Feng, Han Tao, Lei Bao, and Yan Qing, the remaining Yan army unleashed their last strength and launched a fierce counterattack against the Black Wolf Guards and Di Rong soldiers who had stormed the city walls!

In a short time, they actually forced the enemy to retreat step by step.

As the situation seemed hopeless and dawn was approaching, and the Yan army was putting up a fierce resistance, they were suddenly struck by a strange "earthquake." Continuing the attack would result in too many losses.

He glared fiercely at the black figure on the city wall and gritted his teeth, saying, "Send the order! Withdraw the troops! Retreat ten miles and set up camp!"

The mournful bugle call of retreat sounded. The Di and Rong soldiers who had been attacking the city were as if granted a pardon, and they retreated like a tide, leaving behind corpses and siege equipment scattered all over the ground.

When the first rays of dawn pierced the darkness and illuminated the iron-walled city walls, all that remained outside the city were wisps of smoke, burning wreckage, and a desolate battlefield.

The Di Rong army had retreated to a distance and regrouped.

On the city wall of the East Gate, the surviving Yan soldiers helped each other up, watching the retreating enemy. Many of them collapsed to the ground, exhausted, letting out gasps of relief and suppressed sobs.

Lin Feng stood with his sword at the ready, watching the retreating Di Rong army, then glancing at the still-smoking giant pit to the northeast, and finally, his gaze fell heavily on the west courtyard of the garrison headquarters.

Xie Wanqing... that blue light... the mine collapsed...

Is all of this really just a coincidence?

He slowly exhaled a breath of foul air, thick with the smell of blood.

They held out that night. But what about the next? Di Rong had only retreated temporarily; he would not give up. And the mysteries within the city seemed to grow even more perplexing with that blue light and the sudden sinkhole.

"Take stock of casualties, treat the wounded, repair the city walls, and replenish arrows and logs," Lin Feng ordered in a deep voice, his voice weary but still resolute.

"Also, Han Tao, you personally lead a reliable team to the West Courtyard and ask Miss Xie... to come to the main hall to see me. Now."