There were more than 20,000 mutated birds under the control of Ling Yan 13, and more than 10,000 were divided into half, and the appearance of more than 10,000 mutated birds flying on the city wall was like a black and oppressive dark cloud, and even the sky was covered by it.

Bang! Bang! Bang!

The sniper gunners on the city walls began to attack, and hundreds of mutated birds were killed instantly, falling from the sky like dumplings. But this time, the number of mutated birds was too large, and even if hundreds of snipers kept firing, thousands of mutated birds still reached the city wall.

"Huh? These mutated birds didn't attack, and flew directly into the base, what did they want to do, did they act as reconnaissance planes? Seeing that the mutant birds were about to come to the city wall, Lei Zheng hurriedly ordered the war wolves at the top of the city wall to hide in the bunker, but he soon found that these mutant birds flew straight over the city wall to the inside of the base as if they couldn't see them.

"Reconnaissance plane, is it ......" Lei Zheng frowned, and immediately conveyed the situation here to Shen Yan and the others who were fighting inside the base.

When he was notified by Lei Zheng, Shen Yan had already discovered the changes in the air, and Shen Yan was a little skeptical about the assumptions made by Lei Zheng, but those mutated birds did not attack after entering the airspace of the base, which made him believe Lei Zheng's guess a little.

"Is it really as Lei Zheng said, these mutated birds are acting as scouts?" Shen Yan couldn't help but be a little depressed: "This Ling Yan Thirteen has so many means, let more than 10,000 mutated birds make reconnaissance planes, it's really rich!" ”

The mutated birds in the sky were not a threat to Shen Yan, but not necessarily to Guan Feng and them. Therefore, Guan Feng and the others quickly led the wolf warrior into the surrounding buildings, while Shen Yan still stayed outside and kept killing. However, he also kept an eye on it, and directly charged after the mutant bird approached, and entered the urn city, all the way to the doorway of the east city gate.

"I see, they actually set up a defensive line inside the base, and it seems that the rest of the people inside have either fled the base a long time ago, or are hiding underground." Through the secret method, Ling Yan Thirteen finally saw the scene inside the base.

"With so many of them gathered inside the base, then the defensive strength of the walls in other directions must be weak. It's a pity that although the defense there is weak, it is difficult to break through with the city wall, but ...... "In the face of the tall city wall of the first base of Fengcheng, it is impossible for Ling Yan Thirteen to give up the results of the eastern city wall, and surround the entire base on all sides, but the appropriate disturbance can be done."

A long roar quickly came out of Ling Yan Thirteen's mouth, and in an instant, a group of black shadows appeared between the surrounding buildings, and if you looked closely, it was a mutant rat, and there were countless mutant beasts. As soon as these mutant rats appeared, they scattered in all directions, and surrounded the Fengcheng base on all sides, as if they were about to surround the Fengcheng base.

"Earthlings say that rats have big holes, but in the face of this thick wall, it may be difficult for them to penetrate it, but it can be done with a certain amount of disturbance. I wonder if those humans will relocate the people inside to the city wall after they find out? Ling Yan Thirteen said thoughtfully.

The appearance of mutant birds seriously hindered the speed at which the wolves inside the base could kill the mutant beasts, which allowed the mutant beasts to directly break through the defense line and spread inside the base.

"Damn, the elite wolf warrior switch the target, let me destroy these beasts in the sky!" Exposed for fear of a sneak attack by mutant birds, Guan Feng and they could only hide inside the building to kill the mutant beasts, but the buildings inside the base had just been built, and only in the area of the urn city on the east and west sides, there would be some buildings that had already been built. But these buildings are obviously a bit of a tie for more than 10,000 people.

The mutant birds are not yet fully familiar with their own changes, and it is always difficult to adapt to them during the flight, but they are not stupid, under the shooting of the elite war wolves, they quickly shifted their positions and scattered over the base, which caused great inconvenience to the war wolves on the ground who wanted to shoot them.

"It seems that it is not a way to go on with Ling Yan Thirteen like this, and he must be made to lose control of the mutant beast herd." While killing in the doorway while observing the situation in the sky, Shen Yan quickly made a decision, then turned around and rushed out of the doorway, all the way into the inside of the city wall.

"Captain, it's not a way to keep going like this, I'm going to go out and carry out the decapitation operation." Entering the inside of the city wall, Shen Yan ran up to the top of the city wall while contacting Guan Feng and said.

"It's too dangerous for you to go alone, in case you are surrounded by a herd of mutant beasts...... Guan Feng was obviously reluctant to let Shen Yan go into danger.

"It's okay, I'll be careful, I won't be impulsive." Shen Yan smiled and responded.

"Otherwise, I'll take someone with me, and I'll be able to cover for you when the time is right." Guan Feng heard that Shen Yan would not give up, and then said.

"No, it's inconvenient to go there too many people. Besides, there are so many mutant beasts in the base, and you still need to be stationed in the captain to clear them. Shen Yan said negatively.

"Okay, be careful, don't force it if it doesn't work." Guan Feng understood that what Shen Yan said was the truth.

Coming to the top of the city wall, Shen Yan saw Lei Zheng, and the two of them exchanged a little and then turned directly to the city wall on the south side. The entire base not only has two underground passages leading to the outside from the north and south, but there is also an empty bridge at the top of the city wall to go to.

As soon as he came to the southern city wall, Shen Yan saw a dense swarm of mutant rats, and Shen Yan didn't bother to pay attention to them, the hundred-meter-thick city wall Shen Yan didn't believe that they could penetrate it in one go, and even if they could, it would be a long time. It didn't take long for Shen Yan to come to a kilometer south of the base through the empty bridge, and then quietly turned due east through the empty bridge.

Directly east of the base, Shen Yan learned from the exchange with Lei Zheng just now that there were about 100,000 mutant beasts squatting there, and the mutant birds in the sky had also been hovering there. This made Shen Yan judge that Ling Yan Thirteen should be there.

Ling Yan Thirteen could use the secret method to transfer the mutated birds above the base to observe the movements inside the base, but this secret method could not be maintained at all times, so Shen Yan's actions were not discovered by him. Quietly, Shen Yan either passed through the empty bridge or through the ground, and soon came to the periphery of the mutant beast group three thousand meters to the east.

"Well, the strength of these mutant beasts is very strong, and the lowest level is level three, and there are many level four. Damn, the few mutant beasts in the center should be level five! "At the top of a building, most of the mutant beasts on the ground were exposed within Shen Yan's vision, and they were soon surprised to find that the quality of these mutant beasts was very high, and they should be Ling Yan Thirteen's intermediate strength. And those fifth-level existences should be the medium power of Ling Yan Thirteen to control the mutant beasts.

"If this situation had been discovered earlier, it would have been extremely difficult to carry out the decapitation operation, but now ......" Shen Yan's eyes narrowed slightly, and a smile appeared on Shen Yan's face.

Now that he has the great move of spiritual power, he doesn't have to stupidly rush into the mutant beast group to decapitate, all he has to do is to shorten the distance between the other party to a range of five hundred meters.

The farthest distance of Shen Yan's spiritual power is not only five hundred meters, five hundred meters is only the diameter of the range of his spiritual power control, and this is also the range that his current bioradar can cover. According to the special surname of bioradar, Shen Yan had done an experiment before, and if he restrained his mental power, he could break through 500 meters and reach about 1,000 meters. However, it would cost him a lot.

But how tall a building can be, a distance of 500 meters is enough.

Soon, Shen Yan came to the ground, three thousand meters away was already the limit of the empty bridge erection, and he could only sneak in through the ground. In this way, he couldn't help but wonder if the scope of the Zhengkong Bridge should be spread farther away when this battle was over.

When he came to the first floor of the building, Shen Yan saw the mutant beasts not far from the building, those mutant beasts did not look ferocious at the moment, as if they were pets at home before the disaster, obediently standing still and farther away, at most occasionally walking around, but they would not leave their position too far. There are a lot of mutant beasts, which keeps them in a tight formation, and it is very difficult to rush through them quickly.

"I used to feel like my speed was about 100 meters and four seconds, but that's not my limit, if I go all out, there should be room for improvement! But before that, these mutant beasts have to be scratched a little! The mutant beasts were crowded together, which made it unrealistic for Shen Yan to quietly reach the building hundreds of meters in front of him. So he had no choice but to rush, using his speed to rush all the way to the target building before the mutant beast could react.

A flying knife quickly flew out of the knife holster on the outside of Shen Yan's thigh, and then began to accelerate, heading straight for a mutant beast in front of him.

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