What is the most difficult thing to attack Shu?

Forces? Population? Siege equipment?

None of them. The most difficult thing in Shu is the roads, complex and harsh traffic, and the natural barriers of Bashu. During this period, Ye Zhao personally took Xi Zhicai, Fang Yue, Xu Rong and others to investigate the roads everywhere, and the focus was on the three passes, but the results of the results disappointed Ye Zhao.

The widest three passes are Baishui Pass, which is only more than ten feet long, and it is impossible to accommodate the attack of a large army. As long as it is not a too idiot general, only eight hundred soldiers can defend the pass. No matter how many troops the enemy has, it is difficult to display, and it can only be consumed to death a little bit. Jiameng and Zitong passes, depicted from the map and hunters in the mountains, is even more dangerous than Baishui Pass.

This is also what Ye Zhao has always been concerned about. It is not just the three passes. Even if he breaks through the three passes, the terrain in Shu is mostly surrounded by mountains and rivers. The roads are dangerous and difficult, and it is difficult to estimate. If you have to attack by force, you have to go through it. Not to mention that there are only more than 50,000 soldiers in Hanzhong. Even if you double it, you may not be able to break it in ten years.

Liu Wei woke up Ye Zhao with just one word.

I have lived in this era for too long, and I have become accustomed to fighting in the combat mode of this era. But in fact, my biggest advantage compared to the people of this era is not the leading mind, but my survival experience in the last ten years of the last days of my previous life.

He was not the overlord of the base in his previous life. He learned a lot of survival skills in the ten years of survival in the end of the world. Simple flying equipment such as hot air balloons are one of them. The principle is actually not difficult. In the past life, Ye Zhao once made it himself in order to get out of trouble. It was also after most of the human civilization was destroyed. Even in this era when technology was still in its infancy, it was still enough to allow Ye Zhao to establish a world's earliest air force.

Liu Wei didn't know why Ye Zhao was so excited. Until she felt the silk quilt slipping off on her body, she couldn't help but exclaim, glaring at Ye Zhao with a angrily voice: "Why is it that making your husband so happy?"

"Take your wife to heaven another day!" Ye Zhao quickly calmed down and hugged Liu Wei's soft body in his arms and said with a smile: "It's late at night, it's time to sleep. If there is anything, I'll talk about it tomorrow."

Liu Wei looked at Ye Zhao pulling the silk quilt again in confusion, and soon fell asleep. She couldn't help but feel angry. Ye Zhao didn't have the ability to adjust his mood anytime and anywhere to stabilize his emotions. Ye Zhao aroused his curiosity. His previous tiredness had disappeared, but Ye Zhao fell asleep as if nothing had happened, which made her unable to help but hammer Ye Zhao on the chest to vent his dissatisfaction.

There was nothing to say all night. The next morning, when Ye Zhao woke up, he saw Liu Wei depressedly facing her with her smooth spine. When he got up to look, he saw Liu Wei's expression was tired and seemed to have not sleep well. Until Xin'er came in to serve him in dressing, he didn't respond.

"Princess..." Xin'er looked at Ye Zhao with some curiosity.

"No problem, I didn't sleep well last night, don't wake her up." Ye Zhao said softly in a low voice.

Xin'er nodded and signaled that she understood.

After putting on his clothes, he had breakfast accompanied by Xin'er, and went all the way to Shengong Camp and ordered Huang Shao to recruit the best bamboo craftsmen, tailors and carpenters in Shengong Camp, and ordered people to prepare a lot of materials.

Hot air balloons have high requirements for materials, must be tough enough and withstand high temperatures. In addition, the lower the breathability, the better.

Ye Zhao first drew the drawings. His drawings did not give a contour, but the whole picture was then combined with the components of each part after disassembly, and even accurate to the data. The hot air balloon was the mainstream transportation tool of the apocalypse era, the operation was relatively simple, and the production was not complicated. It was just that the load load was necessary, so the balloon itself must be large enough. According to Ye Zhao's plan, a hot air balloon must be able to carry at least five people, including a full set of equipment and enough arrow clusters.

It took a day to select materials, and then the size of the hot air balloon was calculated based on the weight of the material, and then the bamboo craftsman made the outline with bamboo, and then the tailor sewed a large enough cover with some fur inside.

It gathered the best craftsmen from Shengong Camp and took five days to prepare the first hot air balloon.

It is a bit different from the hot air balloons in later generations. It is difficult for Ye Zhao to make outlines with bamboo, but the woven one looks like a huge lantern.

"According to the lord's requirements, this object is tightly sewn and there is no gap." Huang Shao bowed to Ye Zhao and said.

"Using ropes to ignite the brazier!" Ye Zhao naturally would not go up for the first test flight. If there was any mistake and fell down ten feet high, no matter how good his physical condition was, he would not be able to escape being crushed.

"Here!" Huang Shao was not sure, so he ordered people to light the brazier under the lantern. The brazier was filled with tincture oil, and another wick was made, which quickly burned. However, the flame of the wick was not strong enough, and the heat generated was not enough to make the lantern go to the sky.

As the tinder gradually burned, a large number of heaters felt pain and poured in from the hole under the lantern. In the astonished eyes of everyone, this head was designed by Ye Zhao, and it can be said that it was the first hot air balloon in human history in this time and space slowly soaring into the air.

The large ball of rope on the ground was constantly pulled up, holding the hot air balloon, mining coal allowed it to float away, and flew in the air for a quarter of an hour. Only when the turbid oil in the brazier burned out, the hot air balloon slowly landed.

"Lord, this is..." Huang Shao was so shocked that he couldn't speak.

Since the slash-and-burn period, humans have dreamed of flying into the sky one day, but no one has succeeded in countless years. This hot air balloon has an impactful significance for this era. Just looking at the scale of the hot air balloon, it is not a problem to carry a manned air.

"With this thing, the world's heroes are like nothing!" Ye Zhao smiled at the hot air balloon like lanterns and said, "Call all the bamboo craftsmen, tailors and carpenters in the Shengong Camp to give up everything in his hands, how much can he do and how much can he do!"

"Here!" Huang Shao immediately understood what Ye Zhao was going to do when he heard this. He quickly bowed and nodded to Ye Zhao, turned around and went to pass the order.

"Everyone, sit down!" Ye Zhao walked to a bluestone and sat down, and said to everyone with excitement.

"Thank you!" These people are the top craftsmen Ye Zhao has collected. Many of them have even worked in the Shaofu. They have been dealing with Ye Zhao for some time. They know Ye Zhao's temperament and do not refuse. They sit on the ground one by one, looking at Ye Zhao with excitement and said, "Lord, I don't know what this thing is called?"

"I haven't thought about it yet." Ye Zhao looked at the huge lantern. It was really hard to say that the hot air balloon is such an easy-to-understand name. After all, this is a milestone in the history of human evolution. It has realized the dream of flying to a certain extent and has important historical significance... Simply put, the name of the hot air balloon cannot match the identity of his man who created history. It is a bit too much, and it is not very similar to the product of Chinese culture.

"Let's call it a flying boat for now." Ye Zhao looked at everyone and said, "I am going to set up a special unit to be responsible for improving this object. After carrying people to air, how to control the direction and land. I have already had some ideas, but this is not enough. You have also seen that this object cannot last long, so it must be filled with enough tinder or carbon stone, which invisibly increases the load-bearing and cannot carry too many people. Moreover, how to fly faster and safer, it also needs to be considered. This marquis does not have much energy to study this matter. How to make a more sophisticated flying boat in the future needs your help. This thing alone should be enough to keep your name in history."

"Don't worry, lord, I will die!" After hearing this, a group of craftsmen stood up excitedly and sweared at Ye Zhao.

In the entire history, there are not many craftsmen who can be famous in history. If they can study and improve this thing, wouldn’t they be able to achieve the same status as Gongshu Ban and Modi?

这等好事,任谁都不会拒绝.

"In addition, a batch of crossbows that can be used on this object are needed. The range is long and can be continuously fired!" Ye Zhao said to everyone: "Last time I told you about crossbows, but I don't know how it is going?"

"This..." The craftsmen looked at each other, and finally, the oldest blacksmith said: "The lord wanted to imitate the pre-Qin period and cast bronze crossbows. It is indeed feasible. If it is just a single shot, the range can be up to two hundred steps!"

Ye Zhao nodded and signaled him to continue speaking. A crossbow with a range of 200 steps can be regarded as a sniper rifle in this era, and it is useless no matter how far it is. After all, there is no alternative scope. The distance that the human eye can reach is beyond 200 steps, so I am afraid there is no accuracy. Of course, the concentration of fire must be calculated separately.

"As the lord said, we first made a crossbow machine with wood to try it out. At most, we would only fire three crossbows in a row, and the range would be greatly reduced. Even if we were made with bronze as the crossbow body, we would probably only fire five arrows in a row." The old craftsman said a little ashamed.

"It's already good!" Ye Zhao nodded silently and said, "Then let's take a look at people and make 400 bronze crossbows first. This thing is urgent. Before April next year, all the matching arrow clusters must be done."

四月,刘焉那边差不多也该有动静了.

"Don't worry, lord, according to the lord's division of labor, four hundred crossbow machines should be done on time." The old craftsman bowed quickly and said.

"Create more disciples, and these things will increase in the future. Now there are only a thousand craftsmen in the Shengong Camp, which is far from enough!" Ye Zhao stood up and smiled and said, "Okay, let's go and make the drawings first. With your efficiency, if I want a hundred flying boats, you may find it difficult to complete the work on time."

It took five days for a flying boat. Even if it could be faster in the future, it would take one year for a hundred flying boats. At that time, Liu Yan might have already fought without sending troops by himself.

"Don't worry, lord, we will do our best to not disappoint lord!"

"Do it well!" Ye Zhao nodded and stood up and said, "The reward will not be small, but the premise is that inferior people cannot be used as good people, otherwise the lives of the soldiers will be ruined, and I will also settle the score with you."
Chapter completed!