In just three minutes, Ling Feng successively ordered dozens of missile bases to launch four or five rounds of missile attacks on more than a dozen alien spacecraft in the sky.

Basically, the first three rounds, all the anti-aircraft missiles, automatically exploded before hitting the target.

However, to Ling Feng's delight, each round of attacking missiles was getting closer and closer to the alien spacecraft.

At the beginning, the missile rain exploded 300 meters away from the alien spacecraft, and then the next few rounds of missile attacks continued to approach 200 meters and 100 meters......

In the end, dozens of missiles finally managed to hit three alien spacecraft.

Although the threat posed to those behemoths with strong defenses was limited, it was a good start for Ling Feng.

Now that the anti-aircraft missiles can successfully hit those alien ships, there is no need for him to continue to use missiles in the future.

This is because dozens of missile bases have gone through seven or eight rounds of launches, and at present, there are less than 1,000 missiles in each missile base.

Among them, the number of anti-aircraft defense missiles has been reduced to less than 500.

Since anti-aircraft missiles can't have a destructive effect on those alien spacecraft, he can't continue to waste them like this.

He had to keep some of his anti-aircraft missiles to intercept the dark bombs they were throwing.

Tonight's situation made Ling Feng very strange.

After sixteen alien spaceships appeared over the Nine Rock Mountain Defense Zone, they sent hundreds of fighters to attack them.

But they seemed to be on the defensive, and they didn't take the initiative to launch a counterattack against his group of fighters. They didn't throw those terrifying dark bombs to attack the ground.

What's going on? Could it be that these alien invaders, their weapons have a limited attack range? If they are too far away, they will not be able to damage the enemy.

Thinking of this, Ling Feng's heart couldn't help but move, secretly remembering everything that had just happened in the sky.

After pondering for a moment, he seemed to have figured out some important details.

It's all the fighters just now, when they launch missile attacks, the distance between them and those alien spaceships is at least tens of kilometers or more. And those alien ships. There are also tens of kilometers from the ground.

Isn't this too far away? These alien invaders, they simply can't attack their targets?

And Ling Feng thought of a more important point, which was those alien invaders, the dark rays they emitted. Somewhat similar to laser weapons developed by humans. But. They are dark black laser rays, while human lasers are dazzling and concentrated beams.

Both look on the surface. Although they are very different, they are similar in nature. The only difference is that the dark rays emitted by those alien invaders are infinitely more powerful than the laser weapons developed by humans.

However, since they are both laser weapons, it is difficult to avoid a weakness, that is, the attack range is not too far.

For example, the laser weapon developed by human beings is said to be within 20 kilometers and can be effectively attacked, but in fact, beyond a few kilometers away, the power of the laser begins to weaken rapidly, especially in the case of bad weather, the laser weakens more and more.

However, even if their weapons such as the Dark Ray are too far away to fight back against their own fighter groups, then doesn't it still have those terrifying dark bombs?

Since they have descended on the sky above the Jiushi Mountain Defense Area, why not throw out all their killer weapons, dark bombs, at a distance of hundreds of kilometers or even more before their radar monitoring system discovers them, and carry out a devastating bombing on the ground? Why didn't they do that?

Could it be that these dark bombs, which are like giant ladybugs, also have a distance limit?

However, they are physical explosives, not dark rays, so they won't weaken their attack power at all because of distance, right?

Don't? Although they are not affected by distance, they have a time limit? For example, those alien invaders, after throwing these dark bombs weighing thousands of kilograms out of the spaceship, these bombs must explode within the specified time, and the time will not be very long?

If they are too far from the ground, will the dark bombs they throw explode in the middle of the road due to lack of time, and they will not be able to effectively attack the target?

Thinking of this, Ling Feng seemed to know something vaguely in his heart.

He now understands why those alien flying objects, which have been in a passive defensive situation just now, have not been able to make an active counterattack.

However, these are only his personal speculations, and he is not sure whether this is the case or not.

From now on, he will instruct all the robots to keep a close eye on the alien ships in the sky.

If they have a tendency to descend towards the ground, it is enough to prove that they are ready to attack.

Sure enough, at this moment, the sixteen alien spaceships suspended at an altitude of tens of thousands of meters continued to spew out a large amount of black gas from the bottom, and they seemed to have begun to slowly descend.

Bursts of violent roaring sounds continued to resound throughout the sky, and the speed of these alien spaceships gradually accelerated.

After seeing this scene, Ling Feng's face changed, and he hurriedly ordered: "All missile defense bases listen to the order, prepare anti-aircraft missiles, as long as the enemy throws an unknown object, immediately lock on to the target and intercept it!" ……”

"Yes, sir!" Robots in dozens of missile defense bases responded respectfully.

After ordering all the missile bases to prepare for missile interception, Ling Feng immediately issued a combat order to the hundreds of fighters hovering in the sky.

Command hundreds of robots piloting fighter jets to quickly pull the fighters away, and then drive the fighters at the fastest speed to carry out suicide hits on those alien spacecraft.

In the blink of an eye, sixteen alien spaceships descended from an altitude of more than 30,000 meters to 20,000 meters.

Soon, these sixteen behemoths, in the continuous and rapid decline, were already less than 10,000 meters above the ground.

Suddenly, all the alien spacecraft, again emitting a violent roar, suspended in mid-air, stopped.

Immediately after, at the bottom of the sixteen alien spaceships, sixteen giant mechanical arms stretched out, and within each mechanical arm, an oval object weighing more than a ton was gently held.

Suddenly, all the mechanical arms made a throwing motion almost at the same time.

In an instant, sixteen giant ladybug-like dark bombs flew towards the ground with great speed.

At this moment, the robots in the missile defense base launched all the anti-aircraft interceptor missiles that had been prepared for a long time.

The targets of the interception are those dark bombs that emit a terrifying humming sound!

Shout! Shout! Shout! ……

Hundreds of anti-aircraft missiles, like raindrops, poured out, dragging dazzling flame tails, and shot straight at the dozen or so dark bombs that were rapidly descending in the air!

Due to the short distance, most of the dark bombs were not successfully intercepted, and only a few three, at an altitude of several thousand meters, were hit by missiles and detonated! The other thirteen dark bombs, all of which fell within the first line of defense.

Rumble! Rumble! Rumble! ……

The earth shook, and the earth-shattering explosion sounded continuously.

Immediately afterward, within the first line of defense, black shock waves burst out in many places, instantly incinerating everything within a radius of several kilometers into black ashes.

However, it is fortunate that the core range of those dark bomb explosions is all more than ten kilometers away from the military defense line, so the weapons and equipment and construction fortifications on the defense line can be spared.

This also made Ling Feng break out in a cold sweat!

If all those dark bombs just now fell on the first line of defense, then the weapons and equipment he deployed on the line of defense would not know how much they would be destroyed!

Sixteen alien spaceships, after throwing the first round of dark bombs, immediately after, sixteen mechanical arms, retracted into the spaceship again, and after a while, they re-held the dark bombs and poked out, it seemed that they were ready to start the second round of bombing.

Seeing this scene, Ling Feng's pupils contracted sharply, and his breathing became short.

Just when those alien spaceships were about to bend their mechanical arms to eject, suddenly, hundreds of high-speed fighter jets, at a terrifying speed of more than 2,000 kilometers per hour, slammed into those alien spacecraft.

Boom! Boom! Boom! ……

In the dark night sky, the fire is shining! The earth-shattering explosion resounded through the world!

In just a few minutes, 300 MiG-25 and 100 F22 Raptor fighters crashed into 16 behemoths one after another.

Suddenly, all the alien spaceships, under the crazy impact of hundreds of fighters, shook violently and trembled, and the pitch-black huge hull, in many places, there were deep cracks, these are all masterpieces after being frantically hit by fighters......

You must know that the energy generated by a head-on impact of an aircraft with a speed of up to 2,000 kilometers per hour and a weight of dozens of tons is equivalent to the destructive force generated by the explosion of tens of thousands of catties of explosives.

The impact of hundreds of fighter jets is equivalent to these alien spaceships being hit by hundreds of bombshells, such a huge impact energy, no matter how strong their defense capabilities are and how strong the material of the hull is, it is difficult to withstand such an impact.

Therefore, after each alien spaceship has been hit by dozens of planes, if they can still stay in the sky safe and sound, then these alien spaceships are really invincible.

Sure enough, all the alien spacecraft were staggered by a series of fighter jets, and fell to the ground as if out of control, and the place where they fell was Qiulin County, which was outside the first line of defense...... (To be continued......)