In the large operational command and control center of the Lang Son DA Division, the theater command and control dispatch personnel are facing various markers on the computer display screen, dealing with the C3I data transmission chain from the high-altitude E2 Eagle Eye long-range air warning command aircraft outside the theater.

As the core of command and control in the theater command and control of our army's participating units, the greatest function of the DA division is to promptly classify the air fire support requests of the ground forces according to the degree of urgency with the assistance and cooperation of the large-scale computer battlefield dispatch and command system, and connect them with the data links of those unmanned reconnaissance planes and early warning planes cruising over the theater, so as to promptly dispatch groups of combat attack planes on standby in the air to areas in urgent need of air support.

Since our army controls the air supremacy on the battlefield, a large number of unmanned aerial vehicles, supplemented by six Y-7s specially attached to the DA division at medium- and low-altitude relay stations, two U2 reconnaissance planes at high altitudes, and two E2 Hawkeye early warning planes at medium and high altitudes, form an electronic monitoring network covering the theater.

Zhou Yuanchao's report on the enemy situation discovered by them, while reporting to Commander Xu, was also received simultaneously by the command and control center of the DA Division.

Yang Weiping, who had been immersed in the command center, immediately asked Kong Linhua to lock the satellite reconnaissance area within 300 kilometers south of Hongtong Gorge after learning of this situation.

"Commander Xu, I'm Yang Weiping. According to drone reconnaissance, 260 kilometers south of your location, there is a large force of about two armored divisions and two infantry divisions of Annam Monkey rapidly advancing north. Yang Weiping held the microphone in his right hand and put it in front of his mouth, and said with a very solemn face:

"Obviously, Wu Yuanjia is playing the same idea as you. Although I don't know much about military command, with the topography of the Ho Chi Minh Trail, it is certainly not suitable for hard fighting. I suggest that it is necessary for you to change the original intention of the battle and find a way to hold back these four main divisions of the Annam monkeys.

Wu Yuanjia is now dividing his troops, so they are not the main force on the frontal battlefield in Nanding. There was only one armored division and five infantry divisions. In this new situation, I believe that you and Commander Yang Dezhi should know how to readjust the operational plan. ”

Stopping somewhere on the northern section of Highway 6 on the Ho Chi Minh Trail, Xu Shanghuu learned that the enemy army in front of him who was trying to rush north actually had two armored divisions. The two infantry divisions, the two old eyebrows that were originally tightly locked, furrowed even deeper.

"Commander Xu, I personally think that we should hurry up and rush to Hongtong Canyon to block the attack now. It's a bit not very cost-effective. Yang Weiping's voice continued to come from the earpiece in Xu Shangyou's hand:

"Moreover, now the news from the drone shows that the four divisions of the Annam monkeys have begun to speed up and advance towards Hongtong Canyon. I reckon. It may be that our reconnaissance units knocked out the reconnaissance units of the Angolan army and aroused the vigilance of the enemy commanders.

The reconnaissance unit of the Annan Special Service Battalion has always been good at using carrier pigeons to transmit intelligence. As a result, the role of the electronic jammers deployed by the reconnaissance units is very limited. Judging from the images transmitted by the drone, the Annan monkeys of these four divisions obviously intend to control Hongtong Canyon before our army.

Commander Xu, wait a minute, the drone that assaulted has been sent back with a new situation. The Annam monkeys actually took the risk of sending a helicopter landing force! Obviously, they were preparing to occupy the 950 and 1030 heights on both sides of the Hongtong Gorge first.

I suggest that the leading reconnaissance unit be evacuated and sheltered in the vicinity immediately. Hey, hey, hey. Commander Xu, I now have a way to deal with these Annan monkeys! As long as these Annan monkeys really rush forward and want to pass through Hongtong Canyon before our troops arrive, I promise that they will not return!"

"Tell me quickly, how to fight?" Xu Shangyou hurriedly asked.

"The total length of Hongtong Canyon is nearly 20 kilometers. On the right is Route 6, which is connected to Route 15A. Highway 6 is more than 400 meters above Hongtong Canyon and has a total length of 27 kilometers. If we first get out of the way and give up the idea of blocking the attack at Hongtong Canyon, the commander of the enemy army will definitely let the troops pass through the canyon one division after another and enter Route 6 through Highway 15A when he sees that the airborne troops he sent have already controlled the main peaks of Heights 950 and 1030 on both sides of the canyon.

After the two divisions in front were successfully deployed on Route 6, the two divisions behind would inevitably enter the valley with confidence. As long as all the troops after these Annan monkeys are broken into Hongtong Canyon, hehehehe, we can send a group of bombers to blow up these sons of bitches!"

"Director Yang, the clouds in the sky tonight are very thick, the visibility is also very low, and the Hongtong Canyon is surrounded by peaks, so the effect of aerial bombardment will not be too ideal!" Xu Shangyou said with a deep groan.

"Hehe, Commander Xu, you always think so, I think that the commander of the four main divisions who tried to use the Ho Chi Minh Trail to attack Hanoi northward would also think so the commander of the Anjun Army. However, our current air force bombing will not be as indiscriminate as the US military did in the past.

First of all, the highlands and road sections near the Hongtong Gorge have the coordinate points demarcated by the reconnaissance unit before, and these data can be shared by the Air Force at any time. In addition, the three heavy trucks accompanying the leading electronic reconnaissance company of our army carried six unmanned aerial vehicles and three launchers.

The unmanned aircraft used by our army now uses a piston engine, which is light and fuel-efficient, and there is almost no sound during the cruise. Now there are three more in the electronic reconnaissance company for backup. All they need to do is order them to hide near the Hongtong Gorge and release two unmanned aerial vehicles to monitor the canyon, so that the air force can carry out accurate high-altitude bombing according to the accurate coordinates and directions they provide! Commander Xu, our logistics department has specially prepared several hundred tons of high-explosive incendiary bombs for the monkeys in Annan!"

"You little fox is just too shady! Hahaha, but I like it!" Xu Shangyou frowned and laughed loudly.

After cutting off the call, Xu Shangyou immediately gave the leading electronic reconnaissance company to find a hidden hiding place near Hongtong Gorge, and the unmanned reconnaissance plane that could not be recovered before was left alone for the time being.

After receiving the order, Zhou Yuanchao and Xu Yuejin didn't care about cleaning up the battlefield, and quickly evacuated from Hongtong Canyon, erasing all traces left by the wheels, and found a very hidden hiding place near Hehao Binhu.

For the terrain in this area, Zhou Yuanchao now knows everything about it.

Less than five minutes after Xu Yuejin successfully released the two drones, he spotted a batch of American-made UH-1H helicopter gunships flying at high speed from the night sky in the south.

The two Changhong II UAVs circling and flying at a low altitude of 4,500 meters clearly photographed the landing process of the Angolan army's airborne troops composed of 24 UH-1H helicopter gunships to seize the main peak at the 950 and 1030 heights.

Landing in Hongtong Canyon is quite risky. The first batch of the Angolan Army's airborne troops crashed and destroyed three UH-1H helicopters. However, more than 200 Anjun soldiers were sent to the main peaks of the 950 and 1030 heights.

In the next 36 hours, the Angolan army's airborne troops transported nearly 1,000 airborne troops and a batch of supplies back and forth, firmly occupying all the favorable terrain of the eight main peaks of the 950 and 1030 heights on both sides of the Hongtong Gorge. and constructed temporary field fortifications.

April 5, 1979, was a cloudy and overcast day.

At 11:40 a.m., Wu Yuanjia personally led the 318th Motorized Rifle Division of the Annam People's Army from Highway 12 to the three-way junction connecting Highway 15B and Highway 15, which is about three kilometers south of Hongtong Canyon.

Li Chunyang, the platoon commander of an avant-garde reconnaissance platoon waiting on the road, saw this. Immediately trotted over.

A Soviet-made gas military jeep approached smoothly from the rear of the troops.

"Report to the commander-in-chief, our army has completely controlled the 950 Heights and 1030 Heights, and no trace of the Beikou troops has been found on Highway 15 and Highway 6!" Li Chunyang reported loudly. But there was no salute.

The door of the back seat of the Gaz jeep opened, and Wu Yuanjia, dressed in an ordinary sergeant's military uniform, wore an army-green dome wide-brimmed Vietnamese military helmet on his head, got down from the back seat, and looked ahead with binoculars in both hands for a while, then looked around the high ground on both sides, and then raised his head. Through the shade of the trees that covered the sky, he stared at the relatively low clouds in the sky for a long time, and then said in a deep voice: "Order, the troops pass quickly! Seize Highway 6 as fast as possible!"

With Wu Yuanjia's order, the 318th Motorized Infantry Division of the Annan People's Army had no choice but to run a high-intensity march for 72 hours. The whole division marched in a column along Highway 15 in Hongtong Canyon.

Take Route 15A and take Highway 6, which is 420 meters above contour line.

In a dense forest plateau about six kilometers away from Highway 15A, Zhou Yuanchao stood beside Xu Yuejin, watching him convert the images sent back by the drone into radio waves through a signal transmitting device, and radiate silently into the sky.

At this time, in the Hongtong Canyon, Gaz trucks, liberation trucks, Renault trucks, motorcycles, and bicycles formed a long line of twists and turns, half of which was on Highway 6, which was more than 400 meters high, a short section on Highway 15A, and the other half on Highway 15 in the canyon.

About two and a half hours later, the 318th Motorized Infantry Division of the Angolan Army passed through the Hongtong Gorge safely and smoothly, forming a long snake formation of nearly five kilometers on Highway 6, which is more than 400 meters high on the right.

Wu Yuanjia, who was standing at the entrance of Highway 15B, was secretly relieved to see that the 318th Division had safely boarded the No. 6 Panshan Highway.

"Report to the commander-in-chief, according to reliable information from our scouts behind enemy lines, a motorized unit of Beikou is marching at high speed along Highway 6 in the direction of Hongtong Gorge. It is currently about eighty kilometers away from our advance guard!" said a signal corpsman, jumping out of his gas jeep.

Hmph! Hurry over now, that's sending you to death! It's too late! Wu Yuanjia sneered in his heart, waved his right hand, and said solemnly: "Order the 5th Armored Division to pass through the Hongtong Gorge as quickly as possible!" Order the 318th Division to be ready to engage the enemy at any time!"

"Yes!" the signal soldier turned and got into the car.

At four o'clock in the afternoon, the 318th Division, the 5th Armored Division, and the 314th Division of the Annam People's Army all passed safely through the Hongtong Gorge and advanced rapidly on the 27-kilometer-long Highway No. 6.

At 4:30, Wu Yuanjia ordered the 2nd Armored Division, which had been cut off, in two columns, to march into Hongtong Gorge at a marching speed of about 30 kilometers per hour.

At this time, 5,000 meters above Hongtong Canyon, a C130H transport plane slowly circled, and this C130H was the one that destroyed the largest chemical weapons ammunition depot of the Annan army with the mother of a bomb.

At 6,500 meters in the air 50 kilometers north of this C130H, 36 H-6s flew over at a cruising speed of 400 kilometers per hour.

Twelve escorted F14A Tomcats used airborne over-the-horizon radars in the airspace around the bomber group to provide the safest protection for the group.

At 5:30, the cabin door of this C130H slowly opened.

The mother of a bomb was pushed out of the ground by two air sergeants, and according to the coordinates of the dragon that had been calculated before, three large parachutes were opened and quickly fell to the ground.

At this time, the last T62 tank of the 2nd Armored Division of the Angolan Army was driving on a small bend in the middle of Hongtong Canyon.

On one of the main peaks of the 1030 Heights, an Annan soldier who was in charge of the vigilance mission suddenly saw a huge bomb falling from the sky, and immediately shouted in shock: "Enemy aircraft bombing!"

As soon as this group of airborne troops of the Annam People's Army sent the latest enemy situation to their commander-in-chief through the radio station, there was a loud sound that shook the mountains and let out a merciless roar in the Hongtong Gorge.

The high temperature of no less than 2,000 degrees Celsius emitted from the 100 meters from the center of the explosion instantly set the woods in the canyon on fire.

At the same time, the super shock wave that spread out was like a devastating blast of the mountains on both sides of the canyon and collapsed and landslides everywhere.

The gravel and soil produced were piled up into a small hill more than 100 meters high and more than 50 meters wide in the valley road about five kilometers away from the entrance on the south side of the canyon in an instant, and the entire valley road was tightly and impermeable.

A part of the tank fighting vehicles of the 2nd Armored Division of the Angolan Army, which was marching on Highway 6 on the right side of the canyon, were shocked to tumble and fall from a cliff more than 400 meters high at the moment when the mother of bombs exploded.

The steaming flames and an overpressure shock wave comparable to a small nuclear bomb tore apart the already panicked rearguard of the 2nd Armored Division of the Angolan Army on Highway 6 above the blast site.

Some of the light armored vehicles were blown by the steam wave and crashed into the mountain wall on the right side of the road, and then bounced back and rolled from the cliff into the canyon in free fall.

The high temperature generated by the flames caused dozens of T62, T55, and T54 tanks on Route 6 to detonate their ammunition! )