What was the hardest thing to attack Shu?

Troops? Population? Siege engines?

No, the most difficult thing in Shu is the road, the complex and bad traffic is the natural barrier of Bashu, Ye Zhao personally took Xi Zhicai, Fang Yue, Xu Rong and others to survey the road during this time, and the focus was on the three passes, but the results made Ye Zhao quite disappointed.

The widest of the three passes is the Baishui Pass, but only more than ten zhang, can not accommodate the attack of the army at all, as long as it is not too grassy generals, only eight hundred soldiers, can hold the checkpoint, no matter how many troops the enemy army has, it is difficult to perform, can only be consumed a little bit, Jiameng, Zitong two passes, from the map and the mountain Orion depiction, than the Baishui Pass is more dangerous.

This is also what Ye Zhao has always been worried about, not only the three passes, even if the three passes are broken, the terrain in Shuzhong is mostly near the mountains and rivers, the roads are dangerous and difficult, it is difficult to estimate, to attack and pass, Mo said that there are only more than 50,000 soldiers and horses in the entire Hanzhong, even if it is doubled, it may not be able to break through in ten years.

Liu Wei's words woke up Ye Zhao.

I have lived in this era for too long, and I have become accustomed to fighting in the way of fighting in this era, but in fact, the biggest advantage I have compared with the people of this era is not the leadership of my thoughts, but the survival experience of my previous life and the last ten years of life.

In his previous life, he was not the overlord of the base at the beginning, and after ten years of survival in the last ten years, he learned a lot of survival skills, and the simple flying equipment of the hot air balloon is one of them, the principle is actually not difficult, in the previous life, Ye Zhao made it himself in order to get out of trouble, and it was also after most of the human civilization was destroyed, a more practical means of transportation, even in this era when science and technology were still in its infancy, it was still enough for Ye Zhao to set up an air force that could be said to be the earliest in the whole world.

Liu Wei didn't know why Ye Zhao was so excited, until she felt the silk on her body slipping off, she couldn't help but exclaim, glared at Ye Zhao with disgust and said, "What makes my husband so happy?" ”

"Take your lady to heaven another day!" Ye Zhao quickly calmed down, hugged Liu Wei's soft delicate body in his arms and said with a smile: "It's late at night, it's time to sleep, what's the matter, let's talk about it tomorrow." ”

Liu Wei looked at Ye Zhao in confusion and pulled the silk quilt again, and soon sank into sleep, she couldn't help but feel bitter in her heart, Ye Zhao's ability to adjust her mood anytime and anywhere and make her emotionally stable, she didn't have it, she was aroused by Ye Zhao's curiosity, the previous tiredness had disappeared, but Ye Zhao fell asleep like no one, so she couldn't help but hammer Ye Zhao twice on her chest to vent her dissatisfaction.

There was nothing to say all night, and the next morning, when Ye Zhao woke up, he saw Liu Wei sullenly turning her smooth back to herself, and when she got up to look, she saw that Liu Wei looked tired and didn't seem to sleep well, until Xin'er came in to serve him and dress, but there was no response.

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

"It's okay, I didn't sleep well last night, don't wake her up." Ye Zhao lowered his voice and said softly.

Xin'er bowed her head to indicate that she understood.

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

Hot air balloons are very demanding in terms of materials, they must be tough enough and able to withstand high temperatures, but in addition to that, the less breathable the better.

Ye Zhao drew the drawings first, his drawings are not to give an outline, but the whole map is then disassembled with the parts of each part, even accurate to the data, the hot air balloon is the mainstream of the last era of transportation with low noise, the operation is relatively simple, and the production is not complicated, but the load must be considered, 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 the materials, then the weight of the materials was calculated, the outlines were made out of bamboo, and then the tailors sewed a large enough sleeve with some fur inside.

Bringing together the best craftsmen of the Shengong Camp, it took five days to make the first hot air balloon.

is a little different from the hot air balloons of later generations, and it is difficult for Ye Zhao to make the outline of the figure made of bamboo, and the final one is like a huge lantern.

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

"Hold that brazier on fire with a rope!" The first test flight, Ye Zhao naturally wouldn't go up, in case something went wrong, he fell down from a height of more than ten zhang, no matter how good his physique was, he would inevitably break his bones.

"Whoa!" Huang Shao didn't know why, so he ordered someone to light the brazier under the lantern, which was filled with fire oil, and made a wick, which soon burned, but 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 fire oil gradually burned, a large number of heaters were painful, pouring in from the opening under the lantern, and in the stunned eyes of everyone, this one was designed by Ye Zhao, and it can be said that it was the first hot air balloon in the history of mankind in this time and space to slowly take off.

The mass of ropes on the ground was constantly pulled up, and the hot air balloon was restrained, and the coal was mined and let it float away, and it flew in the air for a quarter of an hour, and only when the oil in the brazier burned out, did the hot air balloon slowly descend.

"Lord, this is ......" Huang Shao was already speechless in shock.

Since the beginning of the slash-and-burn period, human beings have dreamed of one day being able to fly into the sky, but for countless years, no one has succeeded, this hot air balloon, for this era, according to the impact of the significance, just look at the scale of the hot air balloon, manned take-off is not a problem at all.

"With this thing, the world is like nothing about me!" Ye Zhao looked at this lantern-like hot air balloon and said with a smile: "Gather all the craftsmen, tailors, and carpenters in the Shengong Camp and give up everything in your hands, how much you can do, how much you can do!" ”

"Whoa!" When Huang Shao heard this, he instantly understood what Ye Zhao was going to do, so he hurriedly bowed, nodded at Ye Zhao, and turned around to give orders.

"Everyone, sit down!" Ye Zhao walked to a bluestone and sat down, facing the crowd with excited faces.

"Thank you, lord!" These people are the top craftsmen collected by Ye Zhao, and even many of them have worked in Shaofu, and they have been dealing with Ye Zhao for some time, they know Ye Zhao's temperament, and they don't shirk it, they sit on the ground one by one, and look at Ye Zhao with an excited face: "Lord, I don't know what the name of this thing is?" ”

"I haven't thought about it yet." Ye Zhao glanced at the huge lantern, such an easy-to-understand name of the hot air balloon was really indescribable, after all, this was a milestone in the history of human evolution, and to a certain extent, it realized the dream of human beings to fly, which has important historical significance...... To put it simply, the name Hot Air Balloon does not match his identity as a man who made history, which is a bit of a problem, and it does not look like a product of Chinese culture.

"Let's call it the Flying Boat for now." Ye Zhao looked at the crowd: "Ben Hou is going to set up a special one, which is specifically responsible for perfecting this thing, after the manned vacancy, how to control the direction, how to land, Ben Hou already has some ideas, but this is not enough, you have also seen that this thing cannot last, so it must be filled with enough fire oil or carbon stone, and it also invisibly increases the load-bearing, can not carry too many people, and how to fly faster and safer, also needs to be considered, Ben Hou does not have much energy to study this matter, how to make a better flying boat in the future, and you still need your help." , this is the only thing, which should be enough to make your name go down in history. ”

"Don't worry, my lord, I will never give up!" When the craftsmen heard this, they stood up excitedly and swore at Ye Zhao's curse.

In the whole history, there are not many craftsmen who can leave their names in history, if they can study this thing perfectly, wouldn't they be able to achieve the same status as the Gong Yi Ban and Mo Zhai?

No one will refuse such a good thing.

"In addition, we need a batch of crossbows that can be used on this object, with a long range, and they must be able to fire in bursts!" Ye Zhao said to everyone: "Last time, I told you about the crossbow, I don't know how it went?" ”

"This ......" The craftsmen looked at each other, and finally, one of the oldest old blacksmiths said: "If the lord wants to follow the example of the pre-Qin Dynasty and cast a crossbow in bronze, it is indeed feasible, if it is only a single shot, the range can be worth two hundred steps!" ”

Ye Zhao nodded, motioning him to continue, a crossbow with a range of two hundred paces, in this era, can be regarded as a sniper rifle-like existence, and no matter how far it is, it is useless, after all, there is no substitute for the scope, the distance that the human eye can reach, beyond two hundred steps, I am afraid that there is no accuracy, of course, the fire must be counted separately.

"According to what the lord said, I first made a crossbow machine out of wood to try it, at most three crossbows in a row, and the range will be greatly reduced, even if I use bronze as a crossbow body, I am afraid that at most it can only fire five arrows in a row." The old craftsman said with some shame.

"It's already good!" Ye Zhao nodded silently and said: "Then let's make four hundred bronze crossbow machines first, this thing is urgent, and before April of the next year, it must be done together with the supporting arrow clusters." ”

In April, there should be movement on Liu Yan's side.

"The lord can rest assured, according to the division of labor between the lord and the lord, the four hundred crossbow machines should be completed on time." The old craftsman hurriedly bowed and said.

"Recruit more apprentices, there will be more and more of these things in the future, and now there are only a thousand craftsmen in the Shengong Camp, which is far from enough!" Ye Zhao stood up and said with a smile: "Okay, let's go and make the drawings to the bookstore first, with your efficiency, if I want a hundred flying boats, I'm afraid it will be difficult for you to complete them on time." ”

It took five days for a flying boat, even if it can be faster in the future, a hundred flying boats, I'm afraid it will take a year, and when the time comes, there is no need to send troops by yourself, Liu Yan is afraid that he has already called.

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

"Good job!" Ye Zhao nodded, got up and said: "The reward will not be less, but the premise is that it cannot be shoddy, otherwise it will ruin the lives of the soldiers, and I will also have to settle accounts with you." ”

"Whoa!"