Three months after losing air supremacy, seeing the helicopter again, the people of the whole base felt so strange, strange, sad, excited, excited, but before they could straighten out their feelings, a black and oppressive cloud began to fly in the distant sky, no, it was not a cloud, but a bird that had mutated.

"Come back soon!" Ordinary warriors had not yet seen the changes in the distant sky, but the commanders who had observed the situation through telescopes were not so calm. In the past, they also thought that we would be the victorious side of humans against birds. But after countless failures and the price of a lot of blood, they had to admit that the sky, like the underwater world, no longer belonged to human beings.

Thankfully, the world of zombies is also divided into several categories. According to the geographical division, there are three categories: the underwater world, the sky and the land. Moreover, they do not unite with each other, and, except for zombies, other mutant beasts, birds, fish, etc. do not actively attack humans. Not to mention fish, they are confined to the underwater world. As long as humans don't go into the water, they can't help anyone. Of course, amphibians like crocodiles are counted separately.

Birds, on the other hand, do not actively attack humans. Otherwise, the human base of the world would have collapsed long ago. You know, the wall is easy to build, but to build an anti-aircraft building, it is not so simple. When mutant birds appeared, humans were also afraid that they would come and attack the base. So humans plan to strike first and take the initiative to attack those birds. But it basically ended in a fiasco, even if it was an occasional victory. It was also a narrow victory at the cost of a group attack and group annihilation. Later, humans discovered that as long as we don't actively provoke birds, and we don't encroach on their territory, that is, no planes take off into the sky, then birds will turn a blind eye to humans. Even if they fly over the base in flocks, as long as the base is quiet at that time, then the birds will fly directly by. But if at that time, there is a big move at the base. Or make noise. If the birds are disturbed, then they are attacked, and it can only be said that the base is self-inflicted.

As for the beasts that are also on land, they have not yet been found to attack the base. But if you encounter them outdoors. They also attack humans mercilessly. Everything goes back to primitive society. Humans don't feed on beasts. But the beasts treat humans as prey, and they are still the most vulnerable prey.

Of course, these are early apocalyptic situations. According to Chen Yan's recollection. In the middle period, that is, two years after the end of the world, zombies, beasts, and birds will slowly unite, at that time, the human base has been bloodbathed again, and the small and medium-sized bases that do not have much strength have been broken again, and the bases that can be retained behind have been built buildings that can defend themselves.

This situation is mainly due to the rise of command-type mutant zombies. This kind of zombie relies on spiritual power, and the principle is the same as that of human spiritual power. Under the guidance of command-type mutant zombies, birds and beasts will obey their commands, so they will attack the human base together with the zombie hordes.

Humans don't know these rules, but they know that birds don't attack bases, but they do attack helicopters because they have invaded their territory.

It is a pity that the shouts of the commanders do not reach the ears of those helicopter pilots. In fact, without them shouting, the pilot also noticed the situation in the distance. Before taking off, they knew the danger of the mission. At the same time, they know the importance of their tasks.

The first five explosions wiped out nearly 200,000 zombies, but this was far from enough to relieve the pressure on the city wall. Although it is known as the three walls, as long as the first wall is breached, the next two walls can not hold as long as the first wall. Therefore, they must destroy at least 200,000 or more zombies in order for the base to survive the attack of this zombie tide.

To achieve this strategic goal, it is necessary to rely on them to sprinkle diesel fuel, gasoline and other flammable materials from the air, and only from the air can they splash on the zombie tide as much as possible.

Before taking off, they were expected to be able to fly for three minutes, and the front was mainly to ensure that the zombie tide within a kilometer of the wall was splashed before they could fly outward. But it was necessary to withdraw to the base within three minutes. However, so far, they have only flown for one minute and forty seconds, and the range of splashing is only about 700 meters. On the wall of the base, flags have been waved, telling them to turn around and return to the base immediately. The pilots wanted to accomplish their goals, but they also knew that even if they weren't afraid of sacrifice or fighting the mutant birds to the death, they couldn't leave the worries of the mutant birds to the base. The base has to face the siege of nearly a million zombies, and it is already very difficult, if you add mutant birds, the base without air defense facilities will definitely be broken through. When the time comes, how many of the millions of survivors will remain?

Therefore, even if they were unwilling, after seeing the flag, the pilots dumped the diesel fuel on the plane, roared back to the base, landed quickly, and cooperated with the ground crew to hide the plane. This series of actions only lasted three minutes.

However, it was these three minutes that relieved a lot of pressure on the base. Countless incendiary bombs roared out and threw them into the zombie crowd indiscriminately, instantly igniting a raging fire. And the smoke from the burning of the zombies also affected the mutated birds that had flown over the base. They were originally just attracted by the helicopter, and when they arrived here, the helicopter was gone, and the air was back under their control, and now they were so smoky that the mutant birds decided not to participate in the melee, and after a period of chaos, the mutant birds also turned around and flew away from the base.

"Whew-" All the people who saw the mutated birds involuntarily exhaled, only to realize that before, they had actually held their breath for so long. They were really afraid, before the zombies could take down the city wall, these mutant birds would swoop down and attack them. Thankfully, thankfully, birds don't get involved in the war between their humans. Well, zombies used to be humans, so for the time being, it's better to see this war as a human war.

The fire attack was undoubtedly very successful, even more effective than the previous explosions. After a few months of decay, the zombies were already dripping with corpse oil, coupled with diesel fuel, the fire burned like this, and many zombies turned into ashes with such a wail. (To be continued.) )

PS: Didn't yesterday's chapter be released successfully? It doesn't seem to be shown at the time of today's update.