Many years later, Bei Yan stood at the balloon test flight field of the Song Dynasty Imperial Camp Air Force, and he could always think of the distant afternoon when Marshal Yue conquered Yuan City. At that time, thunder roared under Yuan City, the battlefield was filled with billowing smoke and dust, mountains collapsed and the ground sank, Bei Yan flew towards the blue sky in a hot air balloon in the whistling north wind, as if he was about to melt into the blue sky.

The commander of the Balloon Battalion, Bei Yan, looked down in a daze. He was suffering from tinnitus and could not hear any other sound, but the whole battlefield was in sight. The northern wall of the southernmost Yuan City had collapsed completely, and most of the Yuan City was shrouded in seven or eight white clouds, looming in and out of sight. In the Song Dynasty military camp, countless soldiers and civilians went from chaos to order, and after some time, a torrent began to flow from the south of the camp towards Yuan City. Under the feet of Commander Bei was a dirt hill built by the Jin Army. One side of the hill had collapsed for a small half, and people and horses were falling on the hill. Commander Bei recognized the five-colored sun-holding flag on the ground of the hill, and could not help but think that the King of Wei of the Jin Dynasty might be among the group of Jin Army generals in a mess, and wondered if he was the unlucky guy who fell off his horse.

Just like that, there was almost a howling in the Jin army camp below, and Commander Bei's balloon was caught in the strong winter wind and flew to the north. As for Commander Bei himself, he was like a wooden sculpture, unable to hear or make any sound, and even unable to move his body. He could only watch the ground getting farther and farther away, and the people on the ground getting smaller and smaller, like ants, until even the ants could not be seen clearly.

It took an unknown amount of time for Commander Bei to slowly come back to his senses. At this time, he no longer had tinnitus. Standing high in the sky, "Isn't this a thousand feet high?" The hot air balloon was slowly floating in the sky. Commander Bei calmed down and looked at the sandbags and bundles of charcoal and firewood piled on the basket under his feet. Then he looked around. The clouds and mist were lingering. He didn't know where his balloon was flying. "It's really deep in the clouds now." Although he said so, Bei Yan didn't miss the surrounding scenery. He tied a knot again on the safety rope that the officers and soldiers of the balloon battalion tied around their waists to prevent them from falling into the air before going up, and tied it tighter. Then he began to control the fire and let the balloon slowly descend at an extremely slow speed.

After an unknown amount of time, suddenly, there was a loud thunder in the sky. Commander Bei's ears started ringing again and he took a step back in shock. Because there was a long rope tied around his waist, his foot stepped on the rope and he tripped over it. He fell out of the basket and was hung on the hot air balloon. At this moment, the thick fog in front of him was blown away by the wind, revealing a group of dark clouds in front. Not far above, silver snakes were dancing wildly and inky black clouds were rolling endlessly.

Commander Bei was hanging in the air, thinking to himself: "This balloon is floating under the dark clouds. Once it rains, it will put out the fire..." He then looked up at the sky and said, "Although this height is not thousands of feet, it is still hundreds of feet high. I'm afraid I'll be smashed into a pulp today, with no body left." He couldn't help but shout, "I'm dead!" He was so frightened that he fainted.

After an unknown amount of time, Bei Yan slowly woke up, "I'm still alive? It's not raining? Hahaha..." After a long howl, Commander Bei looked up and down, and saw that under the reflection of the setting sun, his balloon was still flying in the sky, but the descent speed seemed to be a little fast. It was less than a hundred feet above the ground and he could already see the ground. He could vaguely see a team of knights in golden armor following him not far away.

"Golden man!" Bei Yan regained consciousness and climbed up the rope with great effort and climbed into the basket. The hot air balloon was falling faster and faster, and Bei Yan quickly threw firewood and charcoal into the fire, which was already small, and threw sandbags down, and finally stopped at a place 20 feet above the ground.

At this time, Bei Yan leaned over and looked at the twenty Jin men on the ground, "These damn Jin men!" With the sound of the north wind, he could even hear the Jin men's insults. They must have seen the tiger picture on the balloon and knew that it was a balloon from the Song Dynasty. Some Jin men even took out bows and crossbows to shoot at the balloon.

"Fortunately, these beasts can't fly." Bei Yan thought to himself, "That's good enough." Then he saw a mountain lying in front of him, "Oh no! I'm exhausted. If I crash into the mountainside now, I'm afraid I'll be captured by the Jin people." As if they heard Bei's commanding voice, the Jin cavalry also sped up. Bei Yan could even imagine the smug grins of these Jin people.

"We have to fly higher and get over it!" Looking at the few matches left in the basket, the sandbags had been thrown away, and the helmet had no idea where it had flown to. Commander Bei took off his armor and threw it down. However, the balloon only rose slowly, and it seemed that it could not get over it. Finally, the balloon deflated little by little and landed not far from the top of the mountain.

On the mountain, Commander Bei, who had fallen into the balloon, looked around at the dead wood that was ignited by the charcoal embers. The crackling sound of the burning was intertwined with the hissing sound of the green branches catching fire. The vines, leaves, and all the vibrant plants were burned and curled up in the raging fire that destroyed everything. There was a fire in front of him. In the flames, the surface of the big tree was burned black, and the charred branches became scorching charcoal. He realized that he was surrounded by this sea of ​​fire.

Bei Yan immediately got up and took out a dagger that he carried with him. This dagger was originally a knife he used when he was a tattoo artist. He usually carried it with him just to keep it as a reminder. Now he used it to cut the rope and split the balloon cloth that had a certain fireproof effect. It was quite handy. He quickly cut off a piece of cloth that was barely enough to wrap himself, and Bei Yan used up his last bit of strength to run towards a cave that he had just seen not far away...

The flames shot up into the sky, illuminating the already dark night sky. Not far below the mountain, twenty Jin soldiers were parked, about to return.

PS: I don’t know how high and how fast the hot air balloon made by the Song Dynasty can fly. All the details