The fire borrows the wind, and the wind fuels the fire.

Sandwiched in the Great Black Mountain, Beisha City between the two peaks in the south is like being in the tuyere, the mountain wind has not stopped, and the fire has become, the cold and hot air near the fire and the distance are different to form large and small cyclones, and the fire is getting bigger and bigger.

One moment it only burned for a few miles, and the next moment it quickly spread to seven or eight miles.

Cheng Chumo's department abandoned all unnecessary baggage and sprinted to Taniguchi at full speed, and at this time, Han Lai, the junior colonel sent by Jintai to guard Taniguchi, had just rushed up the mountain to Taniguchi from both sides with two hundred talents.

As a result, when they ran less than three miles in the mountains and forests, the fire behind them suddenly broke out, and soon the red glow was reflected in the sky. The wind came at them with a wave of heat, and the flames followed them closely.

Originally, they had few people and were familiar with the terrain, even if the Tang army threw away their baggage and ran wildly, they were likely to be overtaken by them, but unfortunately their speed in the mountains and forests was far less fast than the speed of the burning sky fire that had already become a fire.

The Tang army in the valley can still run away without distractions, because the fire is burning on the mountains on both sides, and it is not easy to burn down. The people led by Han Lai couldn't do it, the fire chased after their butts, and it burned closer and closer, and the rolling heat wave made them sweat profusely, and they could even feel the feeling of being burned by the flames.

Whether he was burned to death by fire in the mountains and forests, or ran down the valley and was captured or killed alive by the Tang army, Xiao Colonel Han Lai didn't think long before he chose the latter, and when he saw the head running down the mountain, the others also ran.

Just when Junior Colonel Han Lai rushed down the valley with people, and when Cheng Chumo threw away his baggage and rushed to the valley mouth, Jin Tai in Beisha City turned pale, and looked at the fiery big black mountain as if he was stupid.

Li Fuji and Xu Hongcai, the two lieutenants, had just assembled the team, and the guards of the city, those who were sleeping, and all the soldiers came to the city, and they were in a mess like ants on a hot pot.

"General, it's messy, it's all messy, let's run." The two lieutenants shouted loudly to maintain order, but none of them listened, and when they saw that the people below were not listening to the order, they stopped doing useless work, and hurriedly ran to the city wall and shouted to Jin Tai.

"Run, where are you going?" Kim Tae's face grinned like ashes.

"Run out of the valley." The two lieutenants said it as a matter of course.

"Do you think that since the Tang army set the fire and pulled out the camp before the fire started, they will not stop us outside the valley?" Kim Tae asked.

"General, even if the Tang army will intercept it, we have to fight, and there is still a way to survive if we don't fight, we will all die." Li Fuji said loudly.

"Yes, there may be a way to survive if you fight, but I'm tired of the general, I don't want to fight, Fuji, Hong Cai, the soldiers will be handed over to you, I hope you will take them to fight a way out." Kim Tae already had a will to die, of course, the most important thing was that he saw it most clearly, and they had no time to escape.

"General, let's go together." Xu Hongcai shouted to pull Jin Tai to go together.

Jin Tai smiled and took two steps back and waved at them: "Let's go."

"General,,,,, General" Xu Hongcai was about to continue to step forward, but Li Fuji grabbed him and yelled: "Listen to the general, let's go, and escape with the brothers."

Xu Hongcai looked at the general Jin Tai, who indifferently put life and death aside, and then looked at the mountain fire that was getting bigger and bigger, and turned his head and rushed down the city wall with a reluctant roar.

The other side.

The cavalry troops running at the forefront had already rushed out of the valley, and Cheng Chumo, the general manager, was naturally at the front.

This is normal, it belongs to his highest official position, if he doesn't run first, there will be many, many people who dare not run, only if he gets out of danger first, others will leave.

The little soldiers can not care about this, but the generals under those subordinates have to care, and they dare not care. Otherwise, something happened to Cheng Chumo, but they were fine, and the emperor had to deal with them well in order to appease Cheng Chumo's father, Cheng Biting Jin.

Although he rode his horse to the front, he did not run out of the valley, but ran to a narrow place that suddenly shrank and stopped, and then arranged for the cavalry to follow to line up on both sides and began to maintain order.

Those who follow up will be whipped at the light of the crowd and pushed and pushed by in an unorderly manner, and the heavy will be directly shown to the public.

In special periods, it is necessary to use heavy canons, otherwise if it is congested in this place that can only accommodate a few people to pass, then the people behind will not want to come out.

"Young Master, the mountain fire has burned." Cheng Yi nervously stayed by Cheng Chumo's side, looked at the fire that was getting closer and closer, and whispered.

"Don't worry, it'll be fine." Cheng Chumo turned his head and said, and continued to shout to command his subordinates to pass in an orderly manner.

"Don't squeeze, don't squeeze, don't worry, the fire can't burn us, more than a mile ahead is the valley mouth, and it's okay to get out of the valley."

Cheng Yi looked at the eldest young master Cheng Chu's calm and calm command from behind, and was very relieved that there was a successor to the old Cheng family.

It's just that the eldest young master said that it hurt the heavens and the peace, but now there are only more than 2,000 people who have not passed, and it won't take long for everyone to be able to get out of the valley.

When Cheng Yi thought so, something that hurt the heavens and harmony was staged in the valley a few miles away.

Those who have studied physics know that there are three elements in the formation of fire, combustibles, oxygen, and ignition sources.

Generally, these three elements of fire are indispensable.

The fire in the Great Black Mountain, the source of the fire is the people sent by Cheng Chumo to set the fire, and the combustibles are naturally all the plants and animals in the Great Black Mountain, and then add oxygen.

Oxygen is required for the combustion of fire, and the larger the fire, the more oxygen is needed. Now in the Great Black Mountain, the two southern peaks have been blazing, the burning area is more than ten miles, and it is still expanding, expanding rapidly.

The oxygen needed is massive, and such a fire directly drains the oxygen from the valley floor, not only that, but the fire burns oxygen and produces a huge amount of carbon dioxide.

The carbon dioxide is heavier than the air, it will not rise, but will sink, the fire on the mountain burns slowly to the valley, so that the defenders in Beisha City see the hope of escape, but when they ran out of the city and fled to the valley mouth, after escaping for a few miles, they felt that they gradually couldn't breathe, and the speed of escape slowed down, not long after, not only was it difficult to breathe, but also the trachea had a kind of hot pain that was burned by the fireworks,

Then, the first fainting person appeared, and then one after another people fell to the ground, and in the end, the people who ran behind fell to the ground in pieces, and more and more people who ran in front fell to the ground.

Once you fall to the ground, no one can get up.

Jin Tai's thought that the Tang army would be intercepted at the mouth of the valley did not happen at all, and when he gradually felt that it was difficult to breathe, the Tang army had already passed through the narrow place and rushed out of the valley.

rushed to the mouth of the valley without stopping, and ran for nearly ten miles, far away from the big black mountain before stopping to rest.

And from beginning to end, except for Han Lai, who ran from the mountain to the bottom of the valley and was captured by the Tang army, no Goguryeo person could get out of the valley mouth except for Han Lai, who ran from the mountain to the bottom of the valley shortly after it began to catch fire.

If you can take aerial photography at this time, you will see that in the narrow valley from Beisha City to the valley mouth, the valley floor that stretches for seven or eight miles is crawling with corpses, and the corpse closest to the valley mouth is nearly five miles away.