The result was that the convoy on the mission had not yet returned to the train, and the news of the infrasonic cannon's victory over the enemy had spread all over the world, and the diplomatic agencies and intelligence departments of various countries were like sharks smelling blood, and immediately contacted the northern capital through various channels to inquire about the details of the operation in this battle.

In any case, Beidu did not expect that just an experimental military operation would attract so much attention, and the relevant departments immediately approached the allies to disclose some details of the operation to the allies, namely the infrasonic cannon, the hedging silencer system and the dual anti-sound system.

After receiving the information provided by Beidu, all countries were surprised, but they were very excited about this invention of Beidu.

Because the things in the data are the technologies that various countries have mastered for a long time, all the key points are focused on extraordinary design ideas, in other words, any country with the strength to obtain this information can create qualified infrasonic armored vehicles.

"This is special, it's just hanging!" A senior executive commented.

Beidu does not plan to collect royalties, but retains the ownership of infrasonic armored vehicles, and countries that want to manufacture such equipment can apply to Beidu, and after getting a written reply, they can start the project.

This seems to be taking off your pants and farting, but as the old saying goes, you can't hurt people, you can't have the heart to defend people, and Beidu did this because you suffered a lot back then, so you can't pay more attention.

Mi country, Maozi, Europe, but all the countries that have the ability to apply for the first time, only a few hours later, the countries got the production license provided by the northern capital, and immediately arranged the production plan.

According to credible information, some States have not applied for it, but they also intend to manufacture such equipment.

In response, the Northern Capital responded by shelving the dispute for the time being...... Now is the critical period to fight against aliens, it is too trivial to talk about intellectual property, and it is not too late to solve this problem when the aliens are killed.

The provision of production licenses to the allies is based on the same considerations...... There are no eternal enemies, only eternal interests, to put it bluntly, the fight against aliens is the common interest of all countries, at this juncture, no matter what kind of conflict has to make way for the premise of fighting aliens.

The design scheme of the northern capital is not complicated, and countries only need simple adjustments to install this set of equipment on their own armored vehicles.

The stronger the industrial base, the faster the manufacturing speed, it only took a few days for the first batch of armored vehicles to be transformed, and a few days later, the first batch of 28 armored vehicles were secretly transported from the industrial zone in the north of the United States to Washington.

The battle for Washington has lasted for several months, and the Mi army has a chance to recapture Washington, but in order to reduce the pressure on the front line, the Mi army chooses to show weakness and constantly lures aliens to throw their living forces into Washington, turning Washington into a millstone to destroy the enemy.

The battle lasted for several months, destroying a large number of insect swarms and thousands of insect people, but even the Mi army guarding this place did not know the exact number of enemies destroyed.

However, everything was reversed today, first the Mi army guarding Washington received an order to stop the attack, and the defenders who were originally actively attacking changed their previous aggressiveness and turned to the defense in an all-round way.

Immediately, the new armored vehicles secretly drove into Washington at midnight, and each armored car drove into a pre-designated battle station under the cover of the defenders and hid.

Then the defenders received an order to secretly withdraw from Washington, and more than 100,000 troops hurriedly withdrew from the battlefield under the cover of night, and the gunfire that had lasted for several months was suddenly no longer heard, and most of Washington fell into an eerie silence.

The large-scale retreat of the Mi army could not hide the bugs at all, and this situation was quickly reflected to the worms who commanded the battle of Washington, and the worms immediately realized that the situation was wrong, and he immediately remembered the fallen base in Southeast Asia, but he didn't know how to deal with the situation.

Withdraw the biter?

Once the entrance is blocked by the infrasonic armored vehicle, one in the hole is counted as one, and the only end is complete death.

Scatter the swarm?

The infrasonic thing doesn't care about the terrain at all, as long as it's strong enough, it's not a problem to circle the Earth a few times!

The insect man quickly thought of a way, and immediately ordered the insect swarm to attack on all fronts, biting the retreating Mi army and not letting go...... As long as you are mixed with the Mi Army, you have me and I have you on both sides, and the infrasonic cannon of the Mi Army will naturally throw a mouse bogey, and dare not open it casually.

A large number of giant insects immediately poured into the streets, following the route of the retreat of the Mi army.

However, the Mi army has been withdrawn for a while, and it will take a little time for the swarm to catch up with the Mi army, but just when the swarm has just rushed to the ground, the armored vehicles remaining in the city have turned on the infrasonic cannon in time, and the pervasive infrasonic wave instantly envelops half of Washington, and the swarm of insects rushing like a sea tide is like a wave hitting a reef, and I don't know how many giant insects died under the infrasonic cannon and the sound of death.

At this time, the defenders had not withdrawn to a safe distance, and the power of the infrasonic cannon was very low, but as the defenders withdrew farther and farther, the power of the infrasonic cannon became higher and higher, and after about forty minutes, the defenders withdrew to a safe distance, and the infrasonic cannon was running at full power, and the deadly infrasonic wave enveloped most of Washington.

Within the infrasonic cannon's killing radius, not a single giant insect survived, and all of them died under the shock of the infrasound.

The Mi army was not satisfied with this, after killing the giant insects on the ground, the armored vehicles drove out of the bunker and advanced to nearby targets, and the entire Washington was under the monitoring of satellites.

When the armored vehicle finds the hole in the ground and aims the infrasonic cannon mounted on the front of the vehicle at the hole, no matter what is hidden in the hole, it will inevitably die.

At this moment, these twenty-eight armored vehicles are like scythes in the hands of the Grim Reaper, mercilessly harvesting the lives of the alien army, and countless insects on the ground and underground fall to the ground and die in the irresistible infrasound.

After more than an hour, it was impossible for any giant insects to survive in the area shrouded by infrasound, and the armored vehicles of the Mi army began to spread around, preparing to shock all the giant insects in Washington to death.

At the critical moment, the zerg who commanded the swarm made a quick decision and ordered the swarm to withdraw from Washington, intending to retain the living force of the swarm, but his decision was vetoed by the aliens.

The aliens ordered that all the swarms and bugmen who had entered Washington could only fight to the death and not retreat, and no one could be an exception.

The insect man was completely desperate, because no place in the sky, on the ground, or under the ground could escape the infrasound attack, and even if he organized all the remaining forces, it would be useless.

The next evening, Washington, which had suffered for five months and nineteen days in the flames of war, returned to the arms of the Mi army.