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Puffs of smoke drifted from the walls, a thick fog of clouds and ladders that burned on the walls, and the smoke and dust formed by boulders smashing into the walls. The entire Tiger Prison Wall is permeated by it.

Amid the screams and hissing sounds, there were constant coughing sounds, and the war had entered a white-hot state.

At this time, more than a dozen chariots with baffles on the roof, under the cover of smoke and dust, quietly approached the city wall, they ignored the surrounding ladders of their own soldiers who kept falling, as well as the stones thrown by the enemy from the city wall, rushed forward vigorously, and when the chariot rushed to the city wall, Shan Xiongxin led a large group of sappers to jump out of the car and began to dig the tunnel intensively.

The shovel is flying, and everyone is digging desperately.

The Wei army sent to dig tunnels were all stubbers who were strong and carefully selected. As soon as there is an exhaustion of manpower in the front, an exchange is immediately made with the soldiers in the back.

Baskets of dirt were carried out by the soldiers in front and handed over to the auxiliaries in the rear. They immediately picked up the earth and ran to the rear, dumping it into the moat and the ditch to serve as filler, so that they could kill two birds with one stone, disposing of the excavated earth and filling in the ditch so that the troops behind could attack.

The clanging sound of digging seemed so insignificant on the noisy battlefield, but it was clear to the Zheng army scouts who were hiding at the base of the city wall and listening to the movement underground.

Zhang Gongjin and Yang Gongqing are both resourceful veterans, who have been on the battlefield for many years, how can they be defenseless against the enemy attacking the city through tunnels?

As early as the beginning of the battle to defend the city at Tiger Prison, they ordered people to dig a ditch two zhang deep near the root of the city wall, and buried a large vat every ten zhang, and then let a deaf scout stay in the vat to listen to the movement underground.

Although they couldn't hear the shouts of the outside world clearly, they could hear this movement directly from the ground.

Soon after the Wei army began to dig the tunnel, a scout hurriedly left Haogou and ran up to the city and said to Zhang Gongjin: "General Zhang, the Wei army outside the city is digging a tunnel, and the location is fifty-six zhang east of the city gate......

The scout had just finished reporting when another scout came to report: "General Zhang, the enemy is digging tunnels at 87 zhang and 129 zhang east of the city gate, and fifteen, sixty, and one hundred and twelve zhang west of the city gate. ”

After hearing this, Zhang Gongjin frowned and said: "It seems that Li Mi must have personally commanded it today, otherwise he would never have played so many siege tricks." However, our army has long been fully prepared, and we have also considered the possibility of the enemy attacking the city through tunnels, so we are not afraid of him......"

With that, he pondered for a moment, and then commanded, "Continue to listen in the ditch, and report any movement as soon as possible." In addition, he told General Yang Gongqing that in the place where the enemy was digging tunnels, prepare firewood mixed with arsenic, horse manure, sulfur, and some grass, so that when the enemy excavated the tunnels into the city, the wind would drive the enemy away. At the same time, prepare more fire oil and rolling stones and wood to destroy the enemy's covering chariots digging tunnels outside the city. ”

"Yes!" Yang Gongqing immediately responded.

As a result, the Zheng army, who was defending the city, immediately turned the attack to the chariot that had not paid much attention to it.

Just listen to "Boom! There was a loud bang, and there was a violent roar on the roof of the chariot where Shan Xiongxin was, and the Wei soldiers who were digging the tunnel looked up, only to see that the roof baffle wrapped in iron sheets had sinked down a lot violently, making a huge roar, and the bracket had begun to show signs of breaking in many places.

Shan Xiongxin yelled: "Don't care about the situation above your head, everyone keep digging!" ”

Immediately, he snatched a sharp shovel himself, rushed to the front, and flew under the broken city wall, whipping a spade of dirt backwards.

"Boom!" There was another loud bang on the roof of the cart overhead, and a stone the size of a round table smashed into the roof of the cart, which had been smashed and deformed, and the carriage of the chariot was broken in several places.

The sappers shouted, "General Shan, the roof of the car is about to collapse." ”

"Leave it alone, dig, keep digging! It's going to be dug through soon! ”

Shan Xiongxin was already under the city wall at this moment. He had already dug seven or eight feet under the walls of the Tiger Prison, and with each step forward, the sides of the tunnel were propped up with sturdy logs to prevent the walls from collapsing and burying them alive.

At this moment, I heard "Boom!" again. With a bang, a boulder fell again, and a large hole was smashed into the roof of the car, and the originally sturdy bracket suddenly collapsed.

"General Shan, the roof of the car has been smashed, let's retreat." The soldiers in the back cried.

Shan Xiongxin still ignored it, gritted his teeth and continued to dig forward.

After a while, only to hear the sound of "tom", a large hole was broken in the earthen wall in front of them, and a dazzling light shot in, and they actually dug through the tunnel and arrived in the Tiger Prison Pass City.

"Haha! Finally dug through! Shan Xiongxin was overjoyed and couldn't help shouting.

However, before he could rejoice, a bucket of fire oil was poured from the hole just now, and then a bundle of lighted firewood was thrown in, and the cave suddenly caught fire.

Fortunately, Shan Xiongxin was agile and dodged in time, so he was not burned. But the few Wei soldiers behind him were not so lucky, they were doused with fire oil, howling miserably, like several large fireballs.

"Hurry up and put out the fire!" Shan Xiongxin hurriedly shouted.

Several soldiers in the back rushed up, took off their clothes and threw out the flames on the soldiers in front.

At this moment, a large puff of pungent smoke poured in from the entrance of the cave, choking the soldiers in the tunnel with their eyes open and coughing repeatedly.

"Not good! The enemy is pouring the tunnels with poisonous smoke! General go! ”

The two soldiers couldn't help but say, rushed into the tunnel, and dragged Shan Xiongxin out.

At this time, several other tunnels were also dug into the city, but their encounters were similar to Shan Xiongxin's, and they also encountered the enemy's burning smoke, so they could not break into the city at all.

"Fill in the firewood and pour the oil on me!" Yang Gongqing said viciously at this time.

The soldiers of the Zheng army, who had already guarded the base of the city wall, just waiting for the enemy to throw themselves into the net, stuffed the bundles of firewood they had prepared, together with sulfur, grass and other materials, into the tunnel, and then set them on fire. After that, he used a fan to blow the wind and fan the smoke into the tunnel.

Many of the Wei soldiers in the tunnels were burned to death and killed, and the attack died before it could be launched.

When Zhang Gongjin saw the Wei soldiers who escaped from the tunnel outside the city, they all looked embarrassed, and he couldn't help but stroke his long beard under his chin, and said with a smile: "Li Mi Xiaoer, if you want to use this method to break through the Tiger Prison, I'm afraid it won't work!" ”

And Li Mi was also angry when he saw that his attack had been frustrated.

It's just that something happened that neither the offensive and defensive sides expected. And this incident changed the situation on the entire battlefield suddenly.

The underground of the Tiger Prison Pass was originally damp, but after the fire on the cloud ladder before, the part of the city wall began to swell, and a lot of earth and stones fell.

And the tunnel passes through the city wall, and the foundation of the city wall has been dug and loosened. When the scaffolding logs in the tunnel were burned by Zheng Jun, a drastic change occurred.

The city wall, which had been loosened by the earth-stone structure, could not bear its own weight and collapsed downward. Although the Wei army's tunnels were not deep and wide enough, this section of the city wall only collapsed downward, and the part of the city wall that affected the ground was not very large. However, the battlements and bunkers of the collapsed part were destroyed, especially the soldiers on duty on the wall, who thought that the wall was about to fall. One of the soldiers cried out in horror: "Oh no! The walls are crossed! The tiger prison has been broken, everyone run away......"

The one who shouted was a timid Zheng army soldier, he was originally a royal forest army in the famous palace, he was pampered since he was a child, and he was like a frightened bird after he went to the battlefield. When he saw the city wall shaking under his feet, he couldn't figure out the situation for a while, but when the whole wall fell, he naturally screamed in horror.

However, he had barely screamed twice when a bright steel knife slashed through his neck, and a great head flew into the air with a stream of blood, and his headless body stood on the wall for a moment, and then it was planted.

The person who killed him was Zhang Gongjin, and he shouted viciously: "Those who disturb the hearts of our army, kill!" ”

After saying that, he glanced at the surrounding onlookers, and then shouted: "What do you see, why don't you go back to your respective posts to guard the city!" The enemy must not be allowed to rush in! ”

Although the Wei army's tunnel siege failed, they caused the city wall to collapse, and the collapse of the city wall led to a result: the city gate was deformed.

Previously, the Wei army's offensive had always used the tactics of employing a sea of people to fight hard with the Zheng army. After the failure of many siege methods such as ladders, well fences, and tunnels. Li Mi naturally could only put the main direction of attack on the city gate, the acropolis outside the city had already been breached, the Wei army had no worries, and the moat and ditch were filled. The siege vehicle was like no one, and soon drove to the city gate.

"Tom! Tong! Tong! "The siege vehicle carried huge conical logs, and slammed into the gates of the Tiger Prison Gates, and each impact caused the walls and gates to shake violently.

Originally, the city gate of the Tiger Prison was very strong, and if the Wei army just hit the city gate with a siege vehicle, it would not be able to open it at all. However, due to the collapse of the city wall, the door frame of the city gate was loosened, and the screws of the door frame nailing the city gate fell off a lot, causing the door frame to break away from the wall and become crumbling.

In this case, the city gate also became vulnerable, and with each impact, a large cloud of rubble and wood chips fell on the city gate.

Shan Xiongxin was also overjoyed to see that the city gate was a little loose, and he personally went to the front of the siege vehicle, grabbed the log with a sharp cone at the top, and slammed into the city gate again and again. And the Wei soldiers behind him also gritted their teeth and followed, making their last efforts......

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