The entire defense line plus the high hills on both sides is only more than 4,000 meters, and the zombie army is in this defense line, because the terrain is mostly concentrated in front of the defense line of the central two thousand meters. However, because of the different individual strengths of the zombies, there will always be some differences on the way to the impact of the defense line, which leads to the different progress of the zombies before each defense line.

At this time, the snipers on the high hills on both sides, as well as the machine gunners on each section of the defense line, played a key role, and whenever the zombies in front of a section of the defense line were relatively close to the rush, they would focus on taking care of it.

The zombie army had already rushed to the front of the trench, and they were not afraid of the blockade of the trench, and they stepped into the trench without thinking. Bursts of roars came from inside the trench, but the roar continued, and the zombies that had entered the trench were nowhere to be seen. Of course, there was no flat river in the trench, and many sharp steel bars were inserted inverted.

Shen Yan finally waited for the opportunity, he was like a firefighter fighting a fire, and hurriedly rushed to the central defense line, all the soldiers who saw him thought that he rushed to the rescue because a certain section of the defense was in danger, and they couldn't help but smile on their faces to show their gratitude. But only Shen Yan himself knew that where he was so noble, it was nothing more than a trench ten meters away, where there were a large number of zombies.

The zombies who rushed to the front line fell in pieces under nearly 5,000 guns, and then their positions were replaced by the zombies behind, even if some zombies dodged the bullets, but they were blocked by the trench in front, and then jumped down the trench as if they were trapped. Shen Yan's heart was finally balanced a lot, the number of zombies in the two-thousand-meter-long trench was quite a lot, running all the way from one end to the other, and a large amount of star energy was absorbed by him.

The zombies' attacks at the moment are like waves crashing into the beach, wave after wave, and the soldiers behind the defense line are like sand on the beach, no matter how high and fierce your waves are, they will be continuously absorbed by the sand after rushing through them, until the waves finally disappear completely. This cycle is repeating itself endlessly, it is not at all what Shen Yan said, only one or two magazines can completely end this battle.

The width of the defense line was not enough, the number of zombies was large but could not be expanded, and this cycle lasted for half an hour, and the zombies in the eyes of the soldiers were still endless, as if they could never be killed. On the contrary, the trench in front of the defense line was finally filled in after a large number of zombies rushed into it, and the zombies who rushed up in the follow-up finally did not have to fill the trench and could directly cross this defense line.

The killing had completely numbed the soldiers behind the lines, and they just kept shooting, repeating the action of shooting, changing magazines, and firing again. But it is undeniable that after the previous mobilization and subsequent killing, now the soldiers can deal with the zombies calmly when facing the zombies head-on, and the guns in their hands are no longer holding the trigger and holding on, but shooting bullets one by one for point shooting.

Nearly 5,000 soldiers methodically "slow" fire, and the effect was absolutely amazing. If the zombies in the early stage were only manually harvested under their attacks, then under their follow-up attacks, the zombies already belonged to the machine and then harvested, which was absolutely fast.

Finally, after another quarter of an hour or so, the zombie population began to thin out, no longer as dense as it had been. And even if they passed through the trench in front, they could not advance half a step further because of the obstacles and walls of the last line of defense, which made the soldiers more handy. Well, if there is anyone who is the most active person in the entire defense line, it is undoubtedly Shen Yan. He is now like a perpetual motion machine, constantly shuttling through the position of the middle line of defense, it can really be said that one side is in trouble, and he immediately goes to support.

"There are about 50,000 left, you must speed up, otherwise the star energy of the zombies on the battlefield ahead will be lost!" The time was only an hour, but Shen Yan felt that a long time had passed, and if it was a long time, the zombies that had been destroyed on the battlefield would become waste, and there would be no use value.

But zombies are really like what Shen Yan said, their speed is very slow, as long as you are brave enough to face them, is it not difficult to eliminate them at all? Well, this answer is generally true, but in reality, there are no exceptions. Just when Shen Yan was running back and forth behind the defense line, frantically absorbing the star energy in the zombie corpses outside the defense line, there was a sudden change in the camp of the zombie group.

"Roar! Roar! Roar! A series of roars suddenly sounded in the zombie crowd, and this wave of roars did not attract the attention of the soldiers of the defense line at first, after all, this roar was so dense that no one could hear the difference. But after a long time, someone finally reacted, and this wave of roaring was different from the previous ones.

"Damn, there's really a second-level infected!" Shen Yan stopped, he was the first person to discover the change in the zombie roar, through the detection of bioradar, he was able to detect that nearly a hundred meters in front of him, there was a strong fluctuation of consciousness, this fluctuation was at least twice as strong as those first-level infected people.

"Master, there are second-level infected bodies, it seems that the environment here has a great impact on them!" In her mind's eye, Mira reminded.

"All snipers stop shooting, pay attention to the abnormal zombies in the zombie group, and destroy them as soon as they are found!" Shen Yan did not hesitate, and directly gave an order to the snipers on the defensive line.

But in the end, Shen Yan's order was still a little late, and just after his order was given, among the corpses in the direction of ten o'clock on his left, several figures suddenly rushed to the defense line. The height of the "wall" of the defense line is about four meters, which is not a worry for ordinary zombies, but in the face of these sudden appearances, they have already "flew" after just a jump.

"Damn, careless!" Shen Yan scolded angrily in his heart, and at this moment, he immediately rushed to those figures who broke through the defense line. At this time, he also shouted loudly for the first time: "All the soldiers of the defense section, spare a few observers to pay attention to the anomalies in the corpse group, especially in mid-air!" ”

The order was accompanied by a terrible scream, which was so abrupt on the battlefield that the soldiers' tense numbness from the continuous firing finally showed a hint of relaxation.

There were only a dozen zombies that rushed through the defense line, and they were very clever to rely on the ordinary zombies in front of them as cover, and quickly narrowed the distance between them and the defense line and rushed into the defense line. On the defensive section that was rushed through, the soldiers did not react immediately, which made more than a dozen zombies who rushed through the defense line successful, and more than a dozen soldiers were attacked in a blink of an eye.

"Ahh No...... I don't want to die! Another wave of screams sounded, and a young recruit was bitten the arm by the zombie, and in fear, he threw away the gun in his hand and knelt on the ground and screamed.

Shen Yan's order was actually very timely, and the number of unlucky soldiers was not as large as expected, and when Shen Yan rushed to the position where the defense line was breached, several veterans who reacted had already eliminated half of the second-level infected people who rushed into the defense line.

"Poof! Burst! Burst! Shen Yan rushed towards the three nearest second-level infected bodies, and the body that had reached the second-level peak enhancement seemed to loosen in a moment of urgency because of the sudden incident just now, and at that moment, even he felt that his speed seemed to increase suddenly. A pair of dragon teeth had already been held in his hands, and only the sound of three sharp weapons cutting flesh sounded, and the heads of the three zombies locked by him were separated from their shoulders, and the eyes of the soldiers around him were shining brightly!

From the squad leader to the squad leader, the commander of each position with a "chief" shouted frantically: "Quick, pay attention to the anomalies in the corpse group, the machine gunners will sweep me hard, don't let them get close!" ”

On the entire defense line, both the commander and the soldiers knew in their hearts that the zombies must not be allowed to rush through the defense line, otherwise the advantage just gained is very likely to fall into a thousand miles. After all, even veterans are still afraid in the face of zombies, with the blocking of the defense line, they may not be afraid of shooting with bullets, but when the zombies break through the defense line and rush to the front, maybe this fear that has been suppressed will explode again.

"The high mound defense line on both sides began to press forward, forming a side defense line, squeezing the activity space of the zombie group; Throw grenades at each section and blow up their formation! Shen Yan finally solved the last remnants of breaking through the defense line, and issued a new order through the headset.

After nearly an hour of shooting, there are less than 30,000 zombies of more than 100,000, and now it is time to reap the results, and we can't give up easily because of this small episode. Especially the defense line on the high hills on both sides, where many people are idle because of the small number of zombies, let the soldiers on both sides of the defense line begin to break through to form an attack defense line on both sides of the zombie group, which is the greatest support for the front defense line!

The order was executed as soon as possible, especially on the side where Guan Feng was located, and the soldiers of a company quickly moved and advanced, clearing the zombies under the slope while looking for favorable terrain on the side to establish a defensive line in the rapid spread.

The sudden outbreak of zombies, of course, could not be such a wave, just when the soldiers on the high hills on both sides began to break through and rearrange the defense line, a fast-moving figure appeared in the front defense line again, and at the same time, a group of zombies whose bodies were obviously higher than the zombies appeared from the rear of the team. The speed of this group of zombies running is already comparable to that of ordinary people, and in the process of running, the impact they show is even more powerful, and even a few zombies directly grabbed the ordinary zombies around them, and threw the ordinary zombies in front of the defense line, and some directly threw them over the defense line!

"Damn! These monsters can really break through and strengthen in battle! Shen Yan's heart froze, and the person rushed to the place where the accident occurred as soon as possible.