If you change to other people who are not familiar with the nomads in the alpine regions, they will not pay attention to the change in air pressure. Not to mention that they kill the invisible animal carrion corpse in the winter after freezing hard grinding into powder, downwind scattered in the air, downwind water and food will be contaminated, but also inhale the powder, causing an epidemic, in history the Kazakh and Mongolian barbarian tribes have used this ancient method in the centuries-long war, Genghis Khan also used it when fighting with the Western Xia, but the use of ** dried corpse, the most famous is the death of Huo Quai.

Now the air pressure is rising, and it is on the side of the high-pressure ridge, and the high-pressure ridge is easy to form an inversion layer when it moves, and now the smoke in the chimney has a significant sinking, indicating that it is now in the inversion layer. That is, the higher the temperature, which is a natural phenomenon that people living in the Northeast and the Altay Mountains often see. Pollutants do not spread easily, and it is also a kind of weather that is very prone to haze, but the phosgene event in London is because of this inversion weather, and it is easy to form fog. The nomadic people in the north have mastered this phenomenon very early, the Huns call it "Tatar", which means devil's day, under this meteorological condition, due to the high density of the air, it is easy to form aerosols of viruses and dust, and it is also a high incidence period of respiratory diseases and influenza, and the Hezhe people who live in the mountainous areas of the Great Khing'an Mountains in the northeast today still use this name. Under such meteorological conditions, coupled with the powder of rotting corpses, it is difficult not to be hit, and the concentration of the Huns on the southwest side of the wind outlet can effectively reduce this threat. Ouyang Xuan was glad that he had moved the camp to a valley two hundred meters higher than the original camp.

Ouyang Xuan gave the generals a lesson on environmental medicine, which lasted for half an hour, and ordered that any soldiers should be forbidden to return to the original camp to make an illusion, and that the horses that went out should walk on high places to investigate. Ouyang Xuan also had to congratulate himself on his full preparation, each soldier had ten thick masks, in order to prevent frostbite on his face and prevent the respiratory tract from being uncomfortable due to sudden inhalation of supercold air, every time the soldier went out, he covered it thickly.

In the afternoon, Ouyang Xuan took two more personal soldiers to reconnoiter the river valley camp from a distance on the mountain beam, and a layer of gray-black haze was shrouded in it, which was a bit similar to the feeling of overlooking the city on the mountain in later generations. The white camp of the Huns can be seen far away. All of this confirmed Ouyang Xuan's judgment that the Huns were using biological weapons to attack, although it was relatively inferior, if it weren't for the Huaxia Army's complete range of antibacterial drugs, it would have been replaced by other armies. This kind of animal carrion can only transmit bacterial diseases, and the transmission of viral diseases is weak, but it cannot be ignored. When he returned to the camp, he ordered the medical officer to closely observe the soldiers of each battalion for fever, and if they had fever, they should be isolated in separate tents. The same tent soldiers were not allowed to go out of the tent again, and all food and consumption were done in the tent.

In the evening, there was a rumbling sound outside the valley, and the horses came in time to report that the Huns had destroyed the dam body, and a huge amount of hot water gushed out from the spring cave, which had overflowed the camp and joined the river five miles northeast of the camp. Ouyang Xuan was extremely afraid in his heart, this realistic creature attacked, and then it was flooded with ice water, wetting clothes, reducing body resistance, and cold and sickness, it was difficult for the whole army not to waste it. It seems that you have to be more careful in the future, the Huns also have masters, this leader is definitely one of them, if Ouyang Xuan knows that they once gave up stealing the camp, then he will admire this leader even more.

For ten consecutive days, it was the weather under the control of this inversion layer, and the Huns stationed in the southwest have not moved, because of the heavy snow, they have not undergone special training, and it is very difficult for them to investigate, coupled with the fear of shamanism, the Huns sent out very few horses, and they were all killed by the horses detected by the Huaxia army. More than 100 people in the camp also developed fever, cough and other symptoms, and because of the plan in advance, they were all effectively treated, and on the fifteenth day, the northwest wind rose again, blowing away the haze. Except for two soldiers who had pneumonia, everyone else was fine. These two soldiers suffering from pneumonia were also used by Ouyang Xuan with golden stone water that glowed with blue fluorescence, which can be regarded as a kind of luck. The Huns on the periphery chose to retreat three days before receiving information about the horses.

As the air pressure returned to the normal altitude level, the temperature returned to more than minus 20 degrees, and it was a month later, before the order was given to explore the source of the horse's upward journey along the cave, this time it was the second month of the lunar calendar, and it was not long before spring. It is necessary to deal with the Gongwei on the royal court road before the snow melts in spring, otherwise when the snow melts, there will be swamps everywhere, which is also a very troublesome thing.

Three days later, the horse returned, the cave has been upward, straight to the northwest side of the valley of the Xiongnu camp, the road is full of thirty miles, the air circulation in the cave is smooth, there are branch holes leading to the outside, to ensure the gas exchange. Ouyang Xuan discussed with the generals for a day before formulating a bold plan to annihilate the 100,000 Hun soldiers. The troops were divided into three routes, Ouyang Xuan led 20,000 soldiers to enter from the exit of the valley on the south side, Dai Zhan led 20,000 people to enter from the mouth of the valley on the northeast side, Huyan Leopard led 10,000 people to guard the mountain beam to prevent the Huns from escaping, and all the artillery and under the escort of Ouyang Xuan's own soldiers, raided the Hun camp along the cave. The key to this plan was the surprise attack of the artillery, and in order to ensure the smooth operation of the battle plan, Ouyang Xuan personally taught and commanded the combat drill of the surprise attack out of the hole. The pro-soldiers are in groups of five, cross-covering the hole, using the advantage of thermal weapons to form a landing field, covering the artillery out of the hole, and firing the cannon. After several days of repeated drills, during which Dai Zhan, who raided the northeast valley mouth, set off first under the guidance of his guide and walked along the pastoral road to the position where the attack was launched. When the information from all sides came, Ouyang Xuancai and Huyan Leopard led the army out of the valley, and the artillery and personal soldiers on the road directly entered the cave under the guidance of Tanma.

A day later, the parties were in position, and camped fifteen miles from the valley on the south side, and twenty miles away from the northeast as predestined. This pastoral road, Ouyang Xuan believes that the Huns would not have thought that they could know the existence of that pastoral road, this is the route that Ouyang Xuan repeatedly probed out several times according to the topographic map. Later, petroglyphs were found on a mountainside, and through cracking, it was determined that there was indeed a pastoral road here, which could lead directly to the winter nest, which was now the Xiongnu barracks.

Ouyang Xuan made enough noise on the south side, 30,000 horses, horses neighing, shouting. Attracted the attention of the Huns, you can see the shadow of the shadow on the mountain beam from a distance, a lot of horses are arranged on the valley mouth and the mountain beam on the south side, the horse rejection, the arrow tower is readily available, there is a posture of fighting high and low. Ouyang Xuan kept sending small groups of men and horses, day and night, harassing them with crossbow arrows from afar, and harassing them with rockets at night.

On the morning of the second day, the sun was shining, and the temperature had risen sharply to more than minus ten degrees. Pack up your equipment, leave your bags, spare horses, and camels under the management of the logisticians, and line up a mile before the valley on the south side. The 60 gunners of each battalion lined up at the back of the formation, lined up, and according to Ouyang Xuan's order, they first bombarded in front of the formation, and then cleared the attack points on the hilltop beam. The Huns took advantage of the terrain to finish the formation, just waiting for the general's order to beat the horse and charge, although the snow was thick to the horse's belly, but after yesterday's day and night of harassment, the snow had been trampled in the formation of the two armies, and it was not a problem to charge the horse.

Ouyang Xuan didn't talk much nonsense, "All gunners, five medicine packs, the enemy formation in front of the target, put", with the swing of the sword, the 60 cannon in the rear rang out, this is a necessary equipment for every battalion. As the shells fell, the fire and the sound of explosions in the Hun formation, this is the most fatal, the Huns' horses have not received this kind of training, the frightened are innumerable, scattered and ran, and suddenly the Hun army array exploded the battalion. When a round of shelling is over, "each cannon, six medicine packs, the target mountain beam attack point, put". The sound of the cannon sounded again with the swing of the sword, and Ouyang Xuan's sword edge led 20,000 soldiers to rush towards the already chaotic Hun army array. Huyan Leopard, according to the predetermined plan, launched a charge to the mountain beams on both sides.

Ouyang Xuan took the lead, put his sword back into the sheath, drew his knife, and entered the formation, and the soldiers behind him, under the leadership of the captains of each battalion, fanned out in a battalion unit, rampage, and the saber was flying everywhere. A well-made and sharp saber, excellent individual skills, and a perfect combination of Shiwu, the soldiers are invincible. After the Huns panicked, they also organized a team of 10,000 people, wanting to charge forward from the back, at this time they heard the rumbling cannon sound in the camp, gunsmoke was everywhere, this is not a 60 cannon, but a 90 towed infantry gun, all are high-explosive shells, the range is long, the power is strong, just a round of shelling, the camp in the Hun Valley became a ruin, there are two cannons directly bombarded the arrow tower and the attack point at the mouth of the northeast valley to knock off less than one hundred fighters. At this time, Dai Zhan's rushed in from the unsuspecting valley mouth on the northeast side. The gunners of the battalions, together with the artillery battalions, carried out targeted killings of threatening attack points on the ridges.

Ouyang Xuan was followed by two thousand people and fifty personal soldiers, rushing all the way into a no-man's land. Ouyang Xuan's body was full of blood and water frozen into ice, where the enemy army was thick, Ouyang Xuan would rush to kill it, and later the Huns would automatically dodge away as long as they saw Ouyang Xuan, and attack the rear team, but they found that this was a bigger mistake, these pro-soldiers were all specially trained, and the single skills were no longer under Ouyang Xuan, plus the teamwork cooperation, the power was doubled. The Huaxia army followed closely behind is also a tiger descending the mountain, and his personal skills may not be as good as his own soldiers, but he can't stand the cooperation of the five-person group, the bow and crossbow musketeer long-range strike, the gunner's spear stabs directly, the big knife hand slashes horizontally, and the two short swordsmen make up the knife to block, so that the Huns have no way to start, just take a look, it is the bow and crossbow arrows that are whistling, just dodge, the spear is coming, even if the spear counterattack, and is blocked and sneak attacked by the shield of the short knife hand, and then the slash of the big knife hand. There are two columns in each group, with two short swordsmen in front of the road, pikemen and long swordsmen in the back, and finally crossbow musketeers.

Dai Zhan, who entered from the northeast at the back of the Xiongnu army formation, also led his troops to clean up the camp and went straight to the back of the valley mouth army formation on the south side to rush to kill, and the Hun soldiers on the mountain beam who were waiting to launch a reinforcement attack were also unlucky, under the joint attack of 60 artillery and infantry artillery, there were countless casualties, and those who were alive had to go down the mountain, some went straight to the artillery camp, and some joined the valley mouth battlefield on the south side. In addition to being bombarded, the men and horses of the shock artillery battalion had to face a salvo of 5,000 rifles, and the Huns could not pass the 300 paces distance. Huyan Leopard led his troops to finally wait for the mountain beam, cleared the last remnants of the enemy, and killed the wounded and undead Huns.

After clearing the mountain beam and the remnants of the Xiongnu in the camp, Huyan Leopard ordered all the staff to rush down the mountain beam from top to bottom and go straight to the Nangukou battlefield. Ouyang Xuan now didn't know how many people he had killed, nor did he know the identities of these people, but he only knew that there were a few people in gorgeous armor. When Huyan Leopard rushed down the mountain beam, there were no Hun soldiers standing on the battlefield except for a team of 10,000 people who retreated in an orderly manner on the west side. Ouyang Xuan's sword pointed straight to the west, the Huaxia army once again launched a charge, under the leadership of Ouyang Xuan, this team of people and horses is obviously different, not only has strong individual ability, but also knows how to cooperate with each other, even if it is defeated, it is also relaxed and orderly, the snow in front is very thick, and the speed of the horse has slowed down a lot, Ouyang Xuan waved his sword to stop the pursuit, and if it goes on like this, the soldiers will have great damage. The pro-soldier guards had already killed and followed behind from the mouth of the South Valley, and ordered the pro-soldiers to slow down their horses, shoot with rifles, and beat the Hun soldiers who were moving forward with difficulty in the snow. Although it was a bit cruel, it had to be done in order to reduce the loss of soldiers. Every time he lost a soldier, Ouyang Xuan's heart hurt. In addition to his own soldiers slowly chasing the remnants of the enemy, the other soldiers gathered the whole army and counted the battle losses and gains. In the early afternoon, in the makeshift Chinese military tent in the dilapidated camp in the valley, the statistics of all parties were also summarized here.

In this battle, there were no casualties or serious wounded, and 1,000 people were lightly wounded. This result was something Ouyang Xuan expected. The aluminum alloy armor that can effectively protect against the bow and crossbow shot within ten steps, the steel hat and helmet mask, if there is another death, Ouyang Xuan will not forgive himself. But a thousand horses were killed, and five thousand were wounded, and the wounded were caused by falling from their horses. Nearly 20,000 Xiongnu horses were captured, and more than 10,000 people surrendered. Through the identification of the troops, this time he killed the king of Zuogu Li, the king of Huyan and the captain of Zuo Dadu and eight 10,000 captains, and the king of Zuo Xian led the personal guard of 10,000 people to flee westward, still in pursuit. Tens of thousands of cattle and sheep and nearly 100,000 stones of wheat grain were seized from the cave.

Through the surrender of the Xiongnu soldiers, it was learned that this was originally a main winter pasture of the Zuoxian Wang's department, and in order to intercept the Huaxia army, the women and children had to be moved to another winter pasture three hundred miles away, and the troops were stationed here. This is the only way to reach the Shan Yu Royal Court, and it is also a supply point for the Shan Yu Royal Court when moving.

In the evening, the pro-guards returned and brought back the body of King Zuoxian. There were 10,000 people, and there were less than 100 escapees. When the first group of scouts returned, Ouyang Xuan was even more afraid, calling him lucky.