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"Put!" With He Xianxian's second order, another mortar salvo was fired.

"Heavy machine guns, anti-aircraft machine guns, machine gun cover, rocket preparation, assault team, quickly rescue the trapped troops!" He Xianxian gave the order again.

Only then did everyone react, and it turned out that the mortar was shooting a sonic bomb. For more than two months, He Xianxian has been researching and improving sonic bombs.

Not long ago, He Xianxian's research team achieved breakthrough success and developed a sonic bomb that can restrain T5 zombies at the highest. Since it is impossible to find T5 zombies for experiments, this is only theoretical data.

I tried it today, and I found it really useful, and the effect is amazing.

Originally, this experiment did not need to be done by He Xianxian himself, but by the Rocket Army.

After the original discussion, He Xianxian handed over the technical achievements, and the Rocket Force transformed it into a sonic missile according to this, helping the Wuyi Mountain safety area, cleaning up the zombie army on the periphery, and by the way, seeing how the improved sonic bomb works.

However, everyone knows that after the rocket army got the technical results, it actually crossed the river and demolished the bridge, completely ignoring the life or death of the Wuyi Mountain safety zone.

The reason why the Wuyishan Safety Zone didn't make it itself was also because there were not enough materials and equipment to produce it in large quantities, and Yu Min didn't expect that the Rocket Army would turn around and deny people.

Now that it has reached this point, it can only try the effect first, if it can, save the people, and then use incendiary bombs to burn the entire valley.

As for how long it will last in the end, it's up to fate.

If the test fails, then the rest of the troops in the valley can only be sacrificed, after all, the loss of 2,000 men and the total annihilation of 100,000 people, which is better can be chosen.

The assault team quickly took over Wang Xiaofei's department, but Wang Xiaofei's department did not immediately withdraw to the city, but established a defensive position at the gate, and went to rescue the remaining two troops with the commando team.

At this moment of life and death crisis, as long as it is a person, he wants to run inside the city wall, but Wang Xiaofei just ran out and ran to save people.

This behavior immediately added a lot of points to him, and he left a deep impression in the minds of many people, including the young officers of the old generals.

In the hearts of these people, they didn't ask themselves, when it came to that time, would they be the same as Wang Xiaofei, but only admired, because they felt that they couldn't do it, so they admired.

When Wang Xiaofei did this, he would immediately think in the hearts of people who had a heart that he was buying people's hearts.

Indeed, Wang Xiaofei is gambling, using his own and his subordinates' lives to gamble on his future.

Wang Xiaofei knew that he would definitely gain a lot of prestige this time, and Song Rongzong's department was also one of the few troops in the old general's faction that could fight tough battles.

If he saved Song Rongzong, he would definitely be able to win Song Rongzong's help in the chaos that might occur in the future.

Wang Xiaofei is doing his best to save people, and the troops in the city are desperately tilting bullets under the city.

Boxes and boxes of bullets were fired, and boxes were brought in, and the barrels of many heavy machine guns were red and bent, still firing desperately.

Just when everyone was immersed in the power of the sonic bomb, an accident happened, and the T5, which was disturbed by the sonic bomb, began to move.

Especially the two T5 giant hammer zombies that were besieging the city just now, they pulled the chain ball and made a "bang, bang, bang" chain collision sound, which quickly attracted the attention of most people.

"Be careful!" Someone shouted.

But it was too late, and one of the giant hammer zombies had already wielded a hammer ball. The huge chain ball was more than two meters in diameter, and it smashed down, and Wang Xiaofei, who had established a defensive line nearby, was smashed into pulp in an instant.

"Mortar, aim at the T5 zombies, and fire another round of shells!" He Xianxian immediately ordered.

"Doctor, we don't have enough shells for another round!" Someone immediately reminded you.

"How many, how much to fight!" He Xianxian was also anxious: "All the firepower, hit and shoot, give me a way!" ”

The zombies in the valley are densely packed, and there will definitely be a zombie within almost a meter, although most of the zombies are disturbed by the sonic bomb, but because there are too many zombies, there is no gap for them to pass through.

If you want to rescue Song Rongzong's two scattered people, you must kill them and clear a way, so He Xianxian ordered to concentrate firepower and clear a route.

The two departments that Song Rongzong was trapped were also going out to kill with all their might, fighting for the connection with the rescue troops.

In fact, the two sides are not far apart, only about two kilometers, and with the efforts of everyone, the troops who broke through and the troops who rescued them quickly connected.

After the connection, both under and above the city, there was a tsunami-like cheer.

"Retreat!"

While excited, everyone did not forget that they were still in danger, so they did not stop at all, and retreated as quickly as possible.

However, at this moment, someone suddenly exclaimed: "Suffer, the sonic bomb seems to have gone to work, look, the zombies are moving!" ”

"No way, we have tested that ordinary zombies, even zombies below T4 type, will be disturbed for at least five minutes after being hit by sonic bombs.

Now that we've been playing almost three rounds, how could it have lasted less than three minutes? A researcher from He Xianxian's research team said in disbelief.

But the truth is right in front of you, and the zombies are indeed starting to move.

Everywhere were furious zombies, and these zombies began to storm the converging forces outside the city.

And there were a few T5s, desperately rushing to the city gates.

"Quick! Drop the door! He Xianxian immediately ordered.

"No! Our people are still outside, and if we lower the gate, they will surely die! Someone immediately jumped in to stop it.

"Put down the gate, kill the violators!" He Xianxian commanded domineeringly.

In fact, at this time, everyone knows that they must put down the gate now, and if they don't put down the gate, there will be no more chances, you must know that the T5 type zombies are not something they can deal with now.

The entire base has not heard of anyone who is the master of the awakening fifth layer until now, and even if there is, it can't deal with dozens of T5-type zombies.

So when the hanging door fell, there was no one to stop it.

The troops outside the city were desperate when they saw the whereabouts of the hanging door.

However, seeing that the hanging door was about to fall, at this moment, the two T5 giant hammer zombies who had been at the gate suddenly accelerated, and both came to the hanging door, and used their tall bodies to resist the hanging door weighing 10,000 catties.

At that moment, countless zombies rushed towards the gate like a tide, and although the people left by Wang Xiaofei blocked it with all their might, they were never able to stop the pace of those zombies.

No matter above or below the city, everyone saw this scene, and at that moment, three words flashed in everyone's minds at the same time: The city is broken!

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