Upon learning that the palace wall had been completed, the Crown Prince immediately left the palace and was very satisfied after seeing it.

Just thinking about how the walls are made of steel reinforcement gives me a great sense of security.

"Sister-in-law, when will everything your friend prepared be ready?"

"Also, all the materials for the hot air balloon you asked for are ready. Would you like to go and take a look?"

"I have another request. Could you please ask your friend to buy more steel bars?"

"I was thinking, if we built a wall like this at Tiger Head Pass, we could keep them out of the pass, and the people inside wouldn't have to suffer?"

Su Yujiao's eyes lit up. That's right, doing this would eliminate the danger at its source.

If Tiger Head Pass can be defended and all the Gu people can be kept out, the people will not suffer.

"Let me think about it."

"Hutou Pass is too close to the Southern Frontier Kingdom. If we build it directly at Hutou Pass, it might attract their attention."

"If they discover our actions in advance, I'm afraid they will also act in advance, or do something malicious behind the scenes, secretly smuggling one or two Gu people into the pass to harm people."

The crown prince thought for a moment and said, "Then we'll build it inside the pass. People from the Southern Frontier Kingdom won't be able to get in, and they won't be able to see what's happening inside the city from outside."

"Even if the city walls are very high, they still won't be able to find us if we're far enough away."

Su Yujiao nodded: "This method is feasible."

"However, this will happen after Que Chuzhongyuan and Chen Yunniang are in the Southern Frontier Kingdom."

"Otherwise, it might not be useful."

"If they were already hiding in the Ming Dynasty, then building the city wall at Hutou Pass would be pointless."

"Moreover, transporting materials is also a major problem. If we use ordinary means of transport, Chu Zhongyuan might lead his Gu people to attack before the materials even arrive."

"Therefore, we need to use trucks for transportation, as they are fast and can carry a lot."

"But trucks are out of step with this era. Can they really be openly and legitimately displayed in front of the public?"

"I used to ride my motorcycle at night, sneaking around on back roads."

"It's quite fast, but we'll encounter a city gate every so often, and we have to wait until dawn to enter the city before we can continue our journey."

"Moreover, horse-drawn carriages are used within the city, and motorcycles can only be used after leaving the city and reaching remote areas."

"It will still take up a lot of time."

"Only if the road is unobstructed can the speed truly be increased."

The crown prince thought for a moment and said, "The people are just curious, but they may not necessarily be unable to accept it."

"If anyone asks about the origin of the items, I will take full responsibility and will never implicate my cousin-in-law."

Su Yujiao hesitated for a moment. In this critical moment, she really couldn't care less about anything else.

"In that case, I'll have Mr. Wang buy more materials."

“Each wrinkle could be converted into a shelter.”

"The area doesn't need to be too big, the building can be built taller, the conditions don't need to be too good, just enough to hide in."

"In this way, if the Gu people really attack, the people can temporarily hide in the shelter and wait for rescue."

"This way, the number of Gu people will not grow larger and larger."

"After all, if we lose one, the other side will gain one, and that change in numbers can be quite alarming."

The crown prince nodded frantically upon hearing this: "Excellent, excellent! This way, we can protect as many people as possible."

"I'll go back and draft a detailed plan right away."

"By the way, cousin-in-law, can your motorcycle go long distances?"

"Could we buy a few more?"

"Are those kinds of cars hard to buy where you are?"

"I want to equip the Black Tiger Guards with a few vehicles so they can deliver messages faster."

"The more information we receive, the more preparations we can make."

Su Yujiao nodded: "Okay, motorcycles and trucks are not a problem, as long as we have money."

"But weapons are out of the question; I need to get them through special channels."

"I'll ask later if we can get more weapons."

"That's wonderful, thank you, cousin-in-law."

"Let's go, let's try making a hot air balloon first, and see if we can succeed."

"Now that the materials are ready, assembly will be quick."

"good."

When the two arrived at the warehouse, the embroiderers and craftsmen were busy at work.

Su Yujiao took out a set of cloth strips and bamboo strips that were needed and gave the craftsman some instructions.

"You do this, then you do that..."

In about fifteen minutes, a giant bamboo frame was completed. Then, the canvas was fixed to the spherical frame, and it was finished.

“A basket was hung down there. People stood on it, lit oil, and prayed that they could take off.”

"really?"

"That's natural."

How to land?

"A hot air balloon rises by heating the air inside the balloon; to descend, you have to do the opposite."

"The descent can be achieved by releasing the heat inside the sphere."

"Once the fire here is extinguished or reduced, it will gradually fall."

"There are ropes hanging down from the edge of the basket. When it's almost to the ground, several people pull together to secure it to a stone block or a heavy object."

As Su Yujiao spoke, she looked around and pointed to a stone lion, saying, "That stone lion would be perfect as a anchor; it definitely won't be dragged away by the hot air balloon."

Are you asking how to control the direction of a hot air balloon?

The crown prince nodded.

"Actually, the air is layered, and the airflow direction is different at different altitudes. By ascending or descending to different altitudes in a hot air balloon, the direction of the heat can be changed by the direction of the airflow."

The prince didn't understand some of the technical terms, but that didn't stop him from admiring Su Yujiao.

My cousin's wife knows so much!

He hadn't quite believed that the giant ball could fly at first, but now he was completely convinced and looked forward to flying with it.

"Sister-in-law, may I go up and fly for a bit?"

"Not for now. I need to practice first. Find two people to come up with me and let them learn how to operate it."

The Crown Prince thought for a moment and said, "Let's find two people with high martial arts skills. They can protect my cousin-in-law if anything unexpected happens."

Su Yujiao nodded, "Safety is the most important thing."

Although she can time travel, others cannot.

Su Yujiao thought about it and was still very worried. After all, the hot air balloon was poorly made and not professionally made. If an accident happened, wouldn't she be harming others?

So she found three thick hemp ropes, each a hundred meters long, and tied them to the stone lions.

In this way, it can only rise higher and cannot fly randomly.

"Okay, that's much safer."

"Let's go up and give it a try."

The Crown Prince repeatedly instructed, "You must protect the county princess's safety."

"yes."

As the ignition was completed, the hot air balloon slowly rose, then climbed higher and higher. Standing in the hot air balloon, Su Yujiao saw the entire view of the capital city, and even further beyond.

The prince's neck ached from looking up, but he didn't want to blink. The people working in the warehouse, though they didn't dare to run out to look, should still crane their necks to look at the sky outside.

"It flew away, it flew away."