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Rescue operations against the survivors of Twilight Mountain soon began.

Fifteen guns on the armored train launched a heavy artillery bombardment at the zombie legions besieging outside the caves of Twilight Mountain 17 kilometers away.

The shells fell, and explosions rang out. The huge power blasted the zombies into the sky and tore them to pieces. The zombies who were digging and transporting earth and rock were also greatly affected, and the speed of excavation dropped by at least half.

However, at this time, the survivors of the White Twilight Mountain dungeon in the mine did not understand.

Due to the explosive power of the shells, although they did not pose a threat to their mines, they caused the mines to fall with muck and lime.

"Phew!" The person in charge of the defense spat the dirt in his mouth. Scolded: "Damn! What's going on outside! How did it suddenly blow up so badly? ”

One of them said cautiously, "It can't be that zombies want to blow up our mine with explosives, right?" ”

But he was immediately retorted: "You are stupid, if you want to blow up, you will blow up the hole." But listening to the sound, it is obvious that it is bombing everywhere all over the mountains. Moreover, how could zombies be made explosives! ”

"Could it be that the people of the Iron Fortress are blowing up the zombies outside with artillery?" There is speculation.

"Chances are, they've come to persuade us to leave the mine more than once before. I guess they saw the zombies attacking us and wanted to support us with artillery. ”

"It's hairy, it's so nosy. We're guarding it well, zombies can't get in at all! Do they need to be so active? Sister, I just caused Lao Tzu to eat a mouthful of soil. ”

"People are also well-intentioned!" But the person who spoke didn't seem to care at all. But if they knew what the zombies outside were doing now, it was probably too late to cry.

On the other side, in the back mountain of Twilight Mountain, the newly formed engineer battalion of the Self-Salvation Army has also begun to work.

"1 Company, you guys are setting up the excavation equipment and generators at your speed. The 2nd Company was responsible for cutting down trees and preparing to reinforce the excavated mines. The 3rd Company prepared the means of transport and was responsible for transporting the muck. Everyone is picking up the pace, we don't have much time, we have to race against the clock! Huang Chengcheng, the battalion commander of the engineer battalion, commanded on the spot.

Chen Yuan gave them the task of opening the 200-meter-long passage within two hours, entering the back of the mine and rescuing the survivors. Although there is a large machinery and equipment to help, it is still a very heavy task.

In fact, Chen Yuan even beware that two hours was a little too late.

Because of the zombies in the front, they only need to dig twenty or thirty meters to get around behind the guards at the entrance of the cave. The length of the excavation was much shorter than that of the Self-Salvation Army.

Sure enough, even because of the artillery harassment of the self-rescue army, the speed of the zombie group to dig holes was slowed down by half. But only half an hour later, they still dug to a depth of sixteen or seventeen meters. Ten meters or so further on, you can dig to the side of the mine.

Moreover, this time the zombie group has finally discovered the artillery position of the self-rescue army.

Absorbing the experience of the previous times, the corpse generals scattered a large number of zombies around them as eyeliner before the battle began.

After the appearance of the armored train of the Self-Salvation Army, it was soon discovered by the eyes of the corpse general.

So a zombie force of up to 10,000 people set off twenty minutes ago and headed straight in the direction of the armored train of the Self-Salvation Army at a very fast speed.

Now it is less than 1 km away from the armored train. Of course, these were all under the surveillance of the Military Intelligence Bureau of the Self-Salvation Army, so Chen Yuan had no choice but to issue an order to retreat to the armored train. The shelling stopped.

At the same time, in the cave of Twilight Mountain.

A guard from the dungeon of Twilight Mountain asked suspiciously, "Hey, why did the cannon sound stop outside?" ”

"Maybe they don't have shells? Ha ha. ”

"It's also possible that the zombies couldn't rush in at all, so they stopped."

"It's long overdue. It makes Lao Tzu gray now. ”

One of the captains said fairly, "Okay, everyone pay attention to me." There are quite a few zombies that have come to attack us this time, at least fifty or sixty thousand. They can't get into the mines now, but if they choose to besiege us for a long time, we'll be in trouble. It's a good thing that the people of the Iron Fortress can use so many precious cannonballs to help us destroy the zombies. The indiscriminate bombardment just now wiped out at least thousands of their zombies. We'll have a slightly easier fight in the future. ”

"Yes!" The surrounding guards responded.

In fact, on the side of the dungeon of Twilight Mountain, there are many people who still have a good impression of the Iron Castle.

During the months of their dealings with the Iron Castle, they not only traded a large amount of grain from the Iron Castle, which was enough to help them sustain the harvest this autumn. Even half of their weapons and ammunition come from the Iron Castle.

And because the Dungeon of Twilight Mountain doesn't officially restrict the freedom of the survivors here, many of them have been to the Iron Keep.

They love to go shopping and do business in the Iron Castle.

If it weren't for the fact that it's the end times, they think that only places like dungeons are the safest, and many would even want to live in the Iron Castle. Because only by living in such a place can there be a real life.

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There was no cannon sound outside, and the zombies just stopped to clean up the zombies blocking the entrance of the mine, coupled with the order of the team leader, the mine quickly became quiet.

But it was so quiet that some other voices began to appear.

"Hey, did you hear any strange noises?"

A guard of the White Twilight Mountain dungeon, who was attached to the wall of the mine, pushed his comrade next to him and asked.

The person who was asked looked up and listened carefully, but didn't find anything special, so he said disapprerovantly: "No, what a strange sound, it's the zombies outside carrying the corpses." ”

"Oh!" The soldier against the wall also nodded, as if he felt that he was too nervous.

But after a few minutes, the more he drove away, the more he felt that something was wrong, because the zombies outside had stopped carrying zombie corpses, but the strange sound before didn't seem to disappear, but became louder and louder.

So he immediately pushed his comrades-in-arms next to him and said, "Alas, listen to it again, is there any strange sound now?" ”

The person who was pushed looked up again and listened carefully, and then said suspiciously: "It seems that there is indeed a sound." Click-click. ”

"yes, it's been since the beginning!"

"It's like...... It seems to be ......" One of the guards struggled to figure out what it was, and it didn't take long for him to finally think of it. And instantly shouted in horror: "Grass, this is the sound of digging tunnels, oh my god zombies are digging tunnels!" ”

"Huh?" The surrounding guards looked over one after another.

The captain of the squad in charge of guarding here also immediately asked, "What's the situation?" ”

The two previous guards immediately reported: "Captain, we heard the sound of digging on our side, it is possible that zombies are digging in the tunnel!" ”

And the guards near the cave wall on the other side also immediately reported: "Captain, it seems that we have it on our side!" ”

"What!" The team leader was shocked, hurriedly walked to the edge of the mine, put his ear against the wall and listened carefully, and immediately shouted in shock: "Retreat!" Zombies are really digging holes! ”

However, the retreat was still a little late at this time.

(End of chapter)