Don't look at the hostile relationship between the Tibetans, Turks, Khitans and the Tang Dynasty, they still have people in charge of diplomacy in the Tang Dynasty.

Naturally, diplomats are in charge of intelligence gathering.

Most of the information they have gathered in the past is about a certain official or a certain relative.

Including the things in the palace and what the emperor of the Tang Dynasty likes.

Since last year, the intelligence they have collected has been more directed at the Li family Zhuangzi.

said that Li Yi took out something from Linong the day before yesterday, drew the drawings by himself, and sent someone to send them back, but he couldn't bring the real thing, and he would be stopped.

said that Li Yi took out something yesterday, continued to draw drawings, and sent them back.

said that Li Yi asked the people to go to ice chisel together to make money today, as well as tools to stand more firmly on the ice and tools to drill ice.

said that Li Yi asked the people of Chang'an to knead mud to make money, and the people had a better life and had spare money.

said that the fireworks made by Li Yi can be used to blow up the enemy militarily, which is very powerful, and if you buy it, you can only be stared at.

It is said that Li Yi rushed to Henan Mansion with the chickens and ducks on Zhuangzi, and there was a locust plague in a large area east of Taihang Mountain, and the chickens and ducks were coping.

Before it stopped for two days, there was an even more terrifying thing, Li Yi made a big ball that took people to the sky.

How could the envoys sent by the nations not know what the people could think of?

This big ball is killing people, and the Tang army is preparing a lot, how should I deal with it?

The two sides agreed to set up the formation, and then look for opportunities to fight.

As a result, Datang flew over, specifically looking for a flag attack, and commanded a fart.

No, we can't let Datang have it, no, we can't just let Datang have it, we want it too.

Whether the envoys of various countries want to fight with the Tang Dynasty or with other people, they have something new in mind.

"It's right that the hundred workers are disbanded, it's useless to keep it." Yao Chong went to heaven and earth to eat, and there were three people today, and Wei Zhigu did not come.

"Yuanzhi, don't think about it all the time." Lu Huai prudently advised.

He understood how much Yao Chong had worried about and how much trouble he had made because of the affairs of the hundred workers.

"Now the city is full of rumors, we haven't seen the real thing, so we should think of a way." Zhang said to turn the conversation back to business.

"A ball that can take people up must have its drawbacks. Like a flying lamp, it can only move with the wind. ”

Lu Huaishen followed the topic.

Yao Chong's eyes looked at the lantern light outside: "I don't know how many people I can kill, the old man only knows, but whenever the wind blows to the enemy, the enemy will definitely be afraid."

If the day is fine and the wind blows at night, can the soldiers rest in peace? Who is not afraid of being attacked in the dark? ”

Yao Chong found that the deterrent power of the ball may be greater than the actual combat power.

"It's better not to imitate it, otherwise I'd rather not make it out to equip the army than let the enemy learn it."

Lu Huaishen said his thoughts, he was afraid that the Tibetans and Turks would have nothing to do and use hot air balloons to make trouble in the Tang Dynasty.

"The wind is too strong, and if it blows far away, can the ball fly back?"

Zhang Shuo frowned, he understood Kong Ming's lantern and let it go.

When a kite is flown and a wired connection is required, and a ball is connected to a rope, how long does it take?

"I haven't seen anything, I can't talk about it, ask Your Majesty, take one to the palace to have a look, and eat."

Yao Chong found that there was nothing to discuss at the moment, so he simply didn't say anything.

Zhuangzi was eating, and the five hundred feathers Lin Fei rode each to get food, and the topic of discussion was hot air balloons.

"Today, when I went up, at a height of twenty zhang, the wind blew to the east, and when it rose to thirty zhang, it blew to the southeast, and when it was fifty zhang, it blew to the west."

"I also found out, but when I was ten zhang to the north, fifty zhang to the northwest."

"Is it true that the greater the difference in height, the more pronounced the change in the direction of the wind?"

"Let's take a look tomorrow and fly higher, if that's the case, we can adjust the altitude, wouldn't we be able to change direction."

The Feather Riders discover secrets in chatting, as long as they are proficient in altitude and wind direction.

After the hot air balloon without a rope flies out, it can fly back again.

Go to the enemy's head, fly over, choose the height, turn back, the process will be slower, and you will always be able to deal damage to the enemy.

Catch up when the wind is too strong, do not fly.

Li Yi, who was eating in a private room, said that he had a new idea.

"Make a batch of Kong Ming lanterns, a little larger, put the fierce fire oil in it, and then take a plate of incense and light it and put it on the rope that is stretched on the bracket inside.

When the incense burns there, the rope is burned, the lamp or candle is tilted, the oil is lit, and the paper is burned off by a large fire.

Burning canisters of fiery oil fell from the sky and set fire to the enemy camp below.

Many Kong Ming lanterns will fly off and far away, wasting things.

But a battle, a critical moment, succeeded, the enemy camp will be chaotic. ”

Li Yi said the newly figured out method, the two sides fought, and it was enough to succeed once.

"No, if the enemy sees it, the enemy will also learn from it, Tubo always likes to sneak attack my Tang Dynasty."

When Li Chengqi heard it, he had a good idea, and a large number of Kong Ming lanterns were released in the wind, and some of them fell into success.

Now everyone doesn't use it, no one thinks of it, remind the enemy, and the enemy makes up a Kong Ming lantern for an attack.

Waiting for the wind to be a pair, release the military rations and other things that burned Datang, and Datang lost more than the cost of making Kong Ming lanterns.

Li Longji nodded: "Yes, don't say it, so as not to spread it." ”

"Ahh Li Yi thought about it, it makes sense, the Turks don't know how much money they have, there are craftsmen in Tibet, there are fields, and there is oil there.

Tubo wants to make it, and it is guaranteed to be made.

That night was fine, and the next day, Zhuangzi's craftsmen made two more hot air balloons.

Yulin Feiqi continued to go up to test the flight, and the length of the rope was controlled at 200 zhang, and the rope could only be used up at most.

This time, more people came to watch when they heard the news, and they couldn't enter the Zhuangzi, so they just looked outside the Ba Shui.

The hot air balloon is large enough to be seen rising up.

Including the envoys of various countries, when they saw that there were three balls up and down today, sorrow welled up in their hearts and was written on their faces.

The people of Datang cheered when they saw it, as if tomorrow Datang would wipe out all the surrounding forces.

Li Longji's early dynasty ended, and Yao Chong and the three of them did not leave.

"Your Majesty, the minister heard that there is a rumor in the market that the Li family Zhuangzi has a new thing, which is ball-shaped, there is a basket under the ball, and the basket carries people, I don't know ......."

Yao Chong asked directly.

Without waiting for him to finish speaking, Li Longji nodded his head: "Yes, the hot air balloon, the feather forest flying horse is training, and in the future, look for suitable weather and opportunities on the battlefield to attack the enemy army." ”

"Is this thing easy to make?" Lu Huaishen was worried.

"It's easy to make, Li Zhuangzi is easy to make, and others can't make the alcohol they use, and the alcohol blowtorch can't do it either." Li Longji understood what the old minister was thinking.

Zhang said: "How much does it cost?" ”

"I will pay for it, and you don't need to worry."

Li Longji did not mention the cost, and he didn't want the treasury to contribute funds, so he took the money from Zuozang, and the imperial court had to supervise it.

How can Li Yi's Zhuangzi be managed by others? And the cost is divided into material cost and technical cost.

The material is not expensive, but the technology is something that Li Yi finally came up with.

Oh, it's not easy.

"Your Majesty, we want to see it." Yao Chong was quite helpless when he heard that Li Longji did not leave the accounts of the imperial court.

The previous gunpowder was not under the control of the imperial court, so dangerous things.

Today's hot air balloons are not under the control of the imperial court, and the hot air balloons with gunpowder float from Zhuangzi to the imperial city......

"Tomorrow morning, I'll send Yulin Feiqi to bring one over." Li Longji agreed, let you see and understand.