Niu Jinda said directly: "The method you thought of, the minister had already thought of it." The people in the army who are good at climbing mountains have checked many times, but there is no way. There are many capable people in the Flying Tiger Army, but I am afraid that there are very few people who can climb such a high mountain, and it will not play a role if there are fewer people. ”

Zhang Guigui said unconvinced: "That's not necessarily, as long as you can go up to one person, you can go up to many people with a rope." ”

Li You said: "General Niu, you send people who are familiar with the terrain and take the people of the Flying Tiger Army to give it a try, if it doesn't work, let's find a way." ”

Two days later, the people sent to explore the path came back and reported that they really had no way to climb the mountains on either side, and that the only place where they could climb was a distance several zhang high in the middle, and that they were still exposed to the bows and arrows of the Goguryeo people, and they were not sure to force their way through.

Li You and the others have not been idle in the past two days, not only are they thinking of a way, but they also held a Zhuge Liang meeting in the army to mobilize the soldiers to find a way.

At this moment, when they heard that the method of climbing the mountain to attack on the flanks would not work, everyone was very discouraged, so they all looked at Li You to see if the legendary prince could come up with a way.

Li You has actually thought of a way, he is waiting for the pathfinder to come back.

Everyone looked at Li You with hope, waiting to hear him say his famous and inspiring quote: "What a big deal." ”

Li You never disappoints, and when everyone looks at him and smiles, they know that he has a solution.

Zhang Guigui said: "Your Highness, what kind of method have you thought of, come and listen to it?" ”

Li You originally wanted to say, what a big deal. was asked by Zhang Mougui like this, and it was a bit out of place to say this sentence again.

He held back and said, "I have a solution, but it will take some time." These days, it is enough to temporarily stop the assault on Pyeongcheon Fortress and maintain vigilance to prevent a sneak attack by the Goguryeos. ”

Seeing that he didn't say what he would do, everyone knew that what he was going to do needed to be kept secret for the time being. So everyone kept silent. However, since the prince said that there was a way, everyone's hearts have also settled down.

In the following days, Li You took a large number of craftsmen and was busy day and night.

On this day, Niu Jinda, Zhang Guigui and others received a notice from Li You and asked them to report to the construction site where Li You was located. Everyone rushed to the place designated by Li You, and their eyes were immediately attracted by a huge monster.

The thing in front of me is more than five zhang high, and the diameter has reached three zhang, saying that the square is not square and the circle is not round, from the outside it looks like a house, but there is no window, I don't know what it is.

Zhang Guigui saw it, and he said, "Isn't this a Kong Ming lantern?" Oh! How can it be so big? Will this still be able to fly? ”

Li You smiled: "What you said is right, this is also a Kong Ming lantern." ”

Li You originally wanted to build a hot air balloon, but he didn't have the kind of material that was thick enough and could withstand high temperatures, so he thought of building a large Kong Ming lantern.

It was not difficult for the craftsmen to make an ordinary octagonal wooden frame. Then it was covered with ordinary multi-layer fabric, and a large Kong Ming lantern shell was made.

A floor was made at the bottom, and four honeycomb coal stoves were installed on the floor, which formed a complete Kong Ming lantern.

This Kong Ming lantern is big enough to carry multiple people and a lot of supplies. Li You planned to use this Kong Ming lantern and fierce fire oil to attack the general's mansion in the enemy's Pingchuan City and force them to surrender.

The load capacity of the Kong Ming lantern is not a problem, the most important thing is how to control it.

Once the lantern is lifted into the air, it will fly all the way into the air, and the way to control the altitude is to control the fire power in the hot lantern, which can be achieved by adjusting the heat provided by the four honeycomb coal stoves.

If you need to raise it, increase your firepower. When it is time to land, it can be done by gradually reducing the fire until the fire in the honeycomb coal is finally extinguished.

The problem of controlling the lift and height is solved, and the next thing is the problem of controlling the direction. Li You also thought of a way, he installed a hand-cranked blower on the four aspects of the Kong Ming lantern, which can realize the lateral movement of the Kong Ming lantern through aerodynamic force.

After repeated tests, this large Kong Ming lantern can achieve free movement in the air when there is no wind.

However, the only restriction on the use of this Kong Ming lantern is that it must not be windy. In the presence of wind, the small lateral power provided by human power cannot control the direction of its flight.

Niu Jinda, Zhang Guigui and others were very curious and wanted to go up and fly in person.

Li You personally took a craftsman who was familiar with the operating procedures and accompanied Niu Jinda and Zhang Guigui to the Kong Ming lantern.

Niu Jinda saw the craftsman light the honeycomb coal in the furnace, and gradually the Kong Ming lantern began to shake.

Then, Li You personally picked up a clay pot and poured a small amount of fierce fire oil into the honeycomb coal stove, and the fire suddenly increased a lot. With the rapid increase in heat, Kong Ming lanterns rose into the air.

Kong Ming Lantern flew higher and higher, and soon reached a height of more than ten zhang above the ground.

Zhang Guigui saw that the people on the ground were getting smaller and smaller, and shouted excitedly.

Niu Jinda has a fear of heights, he saw the scene below, his legs and stomach began to turn tendons, and he didn't dare to look down anymore.

At this point, the craftsman lifted a bucket and extinguished the fire in one of the honeycomb coal stoves, and the rise of the Kong Ming lantern slowed down.

Then, with an iron tong, the craftsman took the burning coals from another honeycomb coal stove and put them in a nearby iron bucket to douse them with water. Gradually, the lift generated by the heat provided by the fire and the gravity of the lantern itself reached a balance, and the hovering in the air was realized.

Then, each of the four of them stood in front of a blower, which was directed by Li You to shake. The lantern moved laterally, forward, backward, left and right, completing a series of operations.

Later, the craftsman extinguished the fire in a honeycomb coal stove, and the Kong Ming lantern began to slowly descend.

When he reached the ground, Niu Jinda sat on the ground with his legs weakened, his face was pale, and then he vomited.

Li You asked with concern, "General Niu, are you okay?" ”

Niu Jinda waved his hand embarrassedly and said, "It's okay, the minister is very ashamed, and he doesn't fit in well when he gets to a high place." However, Your Highness, this is a good thing. With this thing, we flew over the enemy and hit him wherever we wanted. ”

You can see he's still excited.

Next, the army was ready to attack the city, and then waited on a windless day.