When Heng Jianyun turned around, the only thing he could remember seemed to be a gray figure that was barely visible.

It had a piercing screech, the effect of a swoop accelerating from the sky approaching the speed of sound. The drone, which blows off the connecting bolts and leaves only one wing, has reached the limit speed it can withstand, perhaps Mach 0.8 or Mach 0.9.

After the dive, the leveled drone turned on its infrared headlights, and from the console display, the gate of the main exit of the tunnel was vividly visible. At this time, its doors were open, like an iron fan princess with her mouth open.

The aviation school instructor sitting on the console was so engrossed that the drone, which had lost most of its wings, rushed into the main entrance of the tunnel.

If we can, let's slow down and focus our perspective on the inside of the drone.

In front of the two-metre-long ethylene oxide storage tank is an ultra-high-pressure air cylinder. In front of the cylinder is a mixture of aluminum, magnesium, boron and silicon. Moments after entering the pit, after losing the signal from the console, a circuit control emits a string of currents, connected to the explosives inside the high-pressure air tank.

In microseconds, the explosives in the high-pressure air tank explode the air tank instantaneously, and the high-pressure air rapidly sprays the mixed powder in front of it.

Under the impact of this high pressure, the mixture quickly fills the air in the tunnel. At the same time, the ethylene oxide storage tank is also decomposing in a simultaneous explosion.

The liquid of ethylene oxide atomizes under the high-velocity impact of the air and mixes with the mixed powder that has already drifted into the air.

The last remaining drone body was washed into the mist of ethylene oxide and mixed powder. It exploded into a fireball.

The process of it all. Or even just in less than a second.

Ethylene oxide. It is a flammable and explosive cleaning and poisoning agent in industry. But militarily, it has another identity, and that is a fuel bomb.

Its active chemical properties allow it to ignite in a very short period of time and release extremely high temperatures and energy through combustion.

This aerosol mixed with flammable powders such as aluminum and magnesium is the famous thermobaric bomb. Hu Wenhai does not have ethylene oxide gel technology in his hands for the time being, so he can only mix ethylene oxide with powder in air through two blasts.

In the first explosion, it was the wreckage of the drone that ignited a part of ethylene oxide. In microseconds, the air in this area is depleted of oxygen. This makes the surrounding air rush towards the central point here. Soon, however, the enormous combustion pressure ignited all the surrounding combustibles - including all the ethylene oxide and all the mixed powders.

A large amount of hot air, carbon monoxide, carbon dioxide and other toxic gases began to expand rapidly, and then formed a second explosion.

Ethylene oxide explosions produce five times more power than ordinary explosives, and the temperature of combustion with aluminum-magnesium dust can reach up to 2,000 degrees, and melting steel is just a matter of effort.

The simple principle of thermal expansion and cold contraction, in a narrow space, the oscillation of the air will be repeatedly superimposed, and finally kill people invisibly.

Now, let's turn the time back to normal. In Heng Jianyun's eyes, at that moment, it seemed that there was a little fire coming out of the mouth of the tunnel. However, the effect of this explosion is really pitiful.

Just when he was a little disappointed, suddenly the mouth of the pit was like a western dragon. A long fiery dragon spat out into the sky!

At this moment, Heng Jianyun even clearly felt that the entire mountain under his feet suddenly shook. In addition to the main pit entrance, from far and near, the auxiliary pit mouths also began to spit out tongues of fire and some debris, and even unconscious intact or broken human bodies.

Click, click, the soldier in charge of taking pictures at this time did not forget to take pictures of such a hellish scene.

And then immediately after, a suffocating silence descended on the battlefield. The incessant gunfire disappeared, and the seemingly endless Annanites in the tunnels no longer appeared.

The only reminders that this is a battlefield are the trees that are still burning.

Not only on this battlefield, but also in the front finger of Spring City, and in the military camp of Ma Li Po.

The gunshots like bursting beans on the radio were gone, and even Hu Wenhai didn't know whether his copycat thermobaric bomb had succeeded.

Even if it succeeds, will Heng Jianyun's platoon be able to fight its way out under the siege of the remaining enemies?

And for the front fingers, they don't even know what exactly happened. Battlefield calls relayed by drones have been cut off, and the signs on the digital map representing Heng Jianyun's squad have disappeared.

Had they escaped, or had Hu Wenhai's plan had some effect in the end? Or had their breakthrough failed?

At this moment, everyone's hearts are full of question marks.

Still, it's at least a blessing to be able to ask questions.

After a moment of silence, the Annanite suddenly realized something. Obviously, a memory that seemed long ago long ago resurfaced in their minds.

At that moment, the Annanites recalled the horror of being bombed by incendiary bombs and the humiliation of being ruined by their country.

Are they attacking the Chinese or the Americans?

But even the Americans in the Vietnam War had never heard of such a technology as being able to throw incendiary bombs into a tunnel, how exactly did they do it!

But no matter who the enemy is, the Annan people know that their comrades in the tunnel will not be spared! Some people shouted and turned their heads and ran back into the tunnel, while others picked up their guns again and continued to attack!

"Let's go, go up the mountain!" This is not the time to be in a daze, although he doesn't know what happened, Heng Jianyun subconsciously made the right decision!

With the loss of support, it was inevitable that the offensive of the Annamite was weakened. Heng Jianyun commanded his forty men to rush towards the mountain beam.

"What's going on, can anyone tell me how Heng Jianyun Platoon is doing now!" General Zhang had never fought such a battle, although he had been fighting all his life, he couldn't imagine the situation on the battlefield at this time.

In the command room, everyone looked at each other, but the Iraqis were the only ones who exchanged ears. Ahmad exchanged views with the people of the inspection group, it seems that this kind of battlefield command method is not bad, but precision strikes are too risky!

Can the Iraqis do what even the Chinese military can't do?

The wait is anxious, but time will pass eventually.

The sun will always rise as usual, the darkness will recede, and the dawn will come.

Just as the sun was peeking out of the sky, suddenly, there was a flash on the digital map. Immediately afterwards, a sign reappeared in the south of the Laoshan front!

"Chief, chief, they have appeared! They have gone up to the mountain beam!" the staff officer on duty shouted with some excitement.

The logo of Heng Jianyun's team reappeared on the map, and it was crossing the mountain beam.

"Radio, connect me to theirs!" General Zhang shouted impatiently.

"Heng Jianyun, how is your situation?"

"Report to the chief, we have crossed the mountain beam, but we have not yet thrown off the enemy, the Annan people are simply crazy!"

Heng Jianyun's voice was full of surprise, but it was just that he didn't know what had happened to the Annan people. A battalion of Annan troops, at least two more than a company of people died in the tunnel.

The Annan people who are now chasing after them have long been really crazy.

"Go down the mountain, go down the mountain now! I will let the artillery fire of the military region answer you!"

"Give me the artillery brigade of the military region!"

......

Heng Jianyun and the forty PLA soldiers behind him were almost all wounded, some of them shooting while retreating, and some of them were holding their comrades and running in front.

At this moment, Heng Jianyun's face suddenly changed, he waved his big hand, and shouted: "Comrades, follow me down the mountain! If you can't go, roll down! No one is allowed to turn back!"

Behind them, the pursuing troops of the Annamite were constantly crossing the mountain beams, almost gritting their teeth and rushing towards them. Exposing your back to them at this time is suicide.

Sometimes, however, proximity means the end of the world.

Woo - boom boom boom -

There is no way for the howitzers of the military region to take the Annan tunnel on the anti-inclined plane, but on the battlefield on the positive slope, these Type 66 152 mm plus howitzers are the sickles of death!

The line of fire from the artillery explosion almost followed Heng Jianyun's footsteps, covering the mountain beam of this nameless mountain, and even many shells simply crossed the mountain beam and smashed into the foot of the anticline.

As long as the Annan people dare to show their heads on the mountain beams and the positive slope, there is only one outcome, that is, they will be reduced to ashes in the artillery fire.

In the command room of the front finger, a staff officer constantly issued the latest artillery bombardment data to the artillery brigade according to the positioning information of Heng Jianyun's squad.

It was with such accurate positioning information that our artillery fire was able to avoid their positions, but did not allow the large force of the Annam to climb over the mountain beams.

"Order the artillery regiment of the New First Army to join the attack, order the artillery brigade of the military region to cover and shoot at the enemy positions on Heng Jianyun's return route, and order our army to launch a feint attack on the entire front! Order the new First Army's pull-out operation to start ahead of schedule!"

At this moment, Heng Jianyun and his platoon were like messengers of death. Everywhere they went, there was the roar of artillery fire, and everywhere the Annan people tried to break out of the fire blockade and kill themselves.

The Annamite wanted to capture them, to find out why the Chinese army was able to accurately hit the bridge and the tunnel mouth, and to avenge the death of a battalion of Annamite people!

It's a pity that they never had a chance again.

The bombardment of the sky is a salute for them, and any enemy who dares to stop will be buried by the artillery fire that tears the sky under the light of Bi Dagang's laser target designator!

At 15:23 in the afternoon of the next day, Heng Jianyun and his platoon did not miss a single person and returned to the place where they started. (To be continued......)