Behind Yuan Youzhi and others, some vehicles were also used to form a semicircle to prevent zombies from breaking through the fire net and entering the outer city.

After all, the Northern Federation is powerful. After mobilizing the manpower and material resources of the entire city, it has successively formed two layers of protection to stop zombies.

The first layer is the firepower network built by Yuan Youzhi and others, and the second layer is the vehicles.

Behind the vehicle, Yuan Zhi talked about building a new fence.

After all, the vehicle does not weigh much. If there are only a few hundred zombies, it can still resist a little. But in the face of so many thousands of zombies that are constantly pouring in, it can only hold up for a while and delay the time for the zombies to rush in.

So they have to build walls.

Time was tight and they didn't have time to pour cement.

But just because the weather is cold now, you can dig up the soil, pile it up, and sprinkle a layer of water on top. It will freeze and become very hard in less than half an hour.

Boom boom boom.

Dozens of excavators were operating at the same time, and there were more than twenty trucks nearby transporting the soil dug out by the excavators to behind Yuan Youzhi and the others.

The Northern Federation has a large population, and under Liu Wei's cheers, the people from the outer cities also knew what they were doing.

Once the zombies come in, everyone will be dead.

In an instant, behind Yuan Youzhi and others, nearly 20,000 people were helping to build the rammed earth wall.

There are too many people, making management a bit confusing.

Most of the people were holding shovels over there, digging soil and digging holes.

Digging the outside of the fence a little lower means that the height of the fence will naturally increase.

The crowd was buzzing.

Not far away from them, Yuan Youzhi, He Liangwei, Wang An and others shot dead zombies to prevent them from entering.

Returning to the roof of the Governor's Mansion, Yuan Zhi suddenly felt hot in his heart when he saw this scene.

"There is strength in numbers. As long as we unite as one, we will definitely be able to resist Oil City!" he murmured.

Looking at the people in the outer city, he had a thoughtful look in his eyes.

Maybe I wasn't friendly enough to them in the past.

Perhaps, for the sake of the future of mankind, I really should do this.

Perhaps, the blow they received from the people in Oil City will only make them more united and stronger.

Yuan Zhi looked at this scene, and some of his original thoughts slowly changed.

...

The efficiency of the Northern Federation is amazing.

Two hours later, with the efforts of 20,000 people, a wall nearly three meters high and three hundred meters long was built.

This wall is also three meters thick.

Pour water into the soil, then use a heavy roller to press down to compact the soil, and then wait another half an hour until the soil becomes very hard.

By going back and forth like this four times, a three-meter-high wall was built.

It was built almost within the sight of Yuan Youzhi and others at a speed visible to the naked eye.

The wall has not been completely sealed, and there is a five-meter-wide passage in the middle for Yuan Youzhi and his companions to retreat.

"The blocking wall has been built, retreat in order."

"First team, withdraw!"

"Second detachment, withdraw!"

....

One after another, all the combatants retreated to the blocking wall and continued to stand on the blocking wall to block the zombies outside.

As for the gap, sand, gravel and soil were poured directly from both sides, and water was sprinkled to wait for the cold weather to freeze it.

Everyone present looked at the blocking wall nervously, waiting for the zombies to attack and testing the effect of the blocking wall.

Yin Xi, who was on the outer city wall, felt happy when he saw that the blocking wall was built.

Finally!

When Yuan Youzhi saw that the blocking wall was built, he said to everyone: "Stop attacking!"

He wanted to test the effectiveness of the blocking wall.

Everyone stopped attacking and took two steps back, fearing that the zombies would collapse the wall after the attack, and people would die if they fell.

The gunfire stopped.

Everyone held their breath and looked nervously at the blocking outer wall outside.

There was a lot of discussion among the many survivors in the outer city.

"Do you think you can really withstand it?"

"Hopefully, if we can't withstand it, the people from the Operations Department will definitely not stop here all the time. The ammunition consumption is too high. If we can't withstand it, they may abandon us and run back to the inner city."

"Then you must endure it. I don't want to die. I have just grown up."

"You just came of age? I thought you were over thirty!" He looked at the bearded, unkempt man next to him with a vicissitudes of life in disbelief.

The man with a vicissitudes of life smiled bitterly and said:

"I'm just kidding you. I really just came of age. I became an adult yesterday."

He was silent for a while and said:

"Then you are the same age as my son, but he has not lived to this day. Maybe it would be a relief not to live to this day."

The man with a face filled with vicissitudes of life said: "Well... maybe, life is like this, life is for suffering, I... am used to it."

He looked at the man's image and words that were completely inconsistent with his actual age, and couldn't believe that this boy was only fourteen or fifteen years old when the apocalypse first broke out.

It took just three years to destroy him like this.

My heart was filled with panic.

So he groped around on his body, from top to bottom.

I just couldn't find anything valuable.

I could only awkwardly say to the vicissitudes of life: "Happy birthday to you!"

The vicissitudes of life young man trembled all over, and glanced at him with red eyes, showing a trace of emotion, but it quickly disappeared.

After the last few years of experience in the last days, he couldn't believe anyone.

He even glanced at the middle-aged man suspiciously, thinking whether this old Brother Song had any conspiracy.

Just at this time.

A burst of cheers came.

They both looked over there.

"Hold it!"

"Hold it!"

The rammed earth walls were compacted and became extremely hard under the freezing weather.

Susu!

Liu Wei, who was standing by the blocking wall, saw some dirt being grabbed by zombies and quickly took a few steps back.

But there is very little dirt captured by the zombies, so it obviously works.

"It's not that solid yet, so hurry up and thicken it!" Liu Wei said to everyone.

So everyone continued to thicken the wall, but it was much more relaxed than before.

Because they know that as time goes by, this blocking wall made of rammed earth will inevitably freeze stronger and stronger under the cold air!

in the crowd.

The vicissitudes of life young man saw the leaving figure of the middle-aged man and silently said thank you in his heart.

He can't believe the tenderness others show him, because once he believes and accepts it, one day he will involuntarily trust others and be deceived.

He has suffered this kind of loss before.

He longs for warmth and kindness.

However, he did not dare to expect and accept it.

It's too dangerous, and you might die.

But no matter what, he hadn't heard Lao Song's words of happy birthday in three years.

...

On Jinggui Mountain.
To be continued...