Ang Lee felt that the Great Wall first had a strong defensive role, and then, on the basis of this defensive role, it derived the role of a link between agricultural peoples and nomadic peoples.

In the absence of the Great Wall, it seems that it will be more convenient for agricultural peoples and nomads to come and go, but the fierce nomads will go south to sneak attack and plunder, and will not trade well with agricultural peoples, since they can grab a lot of wealth with swords, so why exchange their cattle and sheep?

With the Great Wall, the situation is completely different, when the nomads go south, they will be blocked by the Great Wall, if they are forced to attack, they will suffer great losses, if they go south every time they lose a lot, then, no nomadic tribe can afford it.

However, the daily life of the nomads also needs more materials, and most of the materials must be obtained from the farming people, since the road of plundering in the south is not feasible, then it can only take a more moderate method, that is, the so-called mutual market, with their own surplus cattle, sheep and horses, as well as cherished special medicinal materials, to exchange for the food, salt, iron, silk, tea and other items they need.

In other words, it is precisely because of the existence of the Great Wall that the surrounding nomads have to shake hands with the farming peoples, and use their own materials to exchange products with the farming peoples, so as to promote the prosperity and stability of the two ethnic groups, in this process, the great role of the Great Wall is obvious.

The Great Wall is an extremely important defense facility for agricultural peoples, and for nomads, it is actually not a bad thing, because after the Great Wall, some of the careerists of the nomads will be restrained, so as to govern their tribes in peace, and will not take their own tribe's soldiers and horses to the south to rob, although the south robbery can obtain a lot of wealth, but every time you go south, it means that there are many tribal youths to bury their bones in other places, and the long-term war hurts not only the farming people, but also the nomads. It is also a continuous bloodshed and sacrifice, which is not good for both sides, and the Great Wall can make peace between the two peoples, which is not a good thing for everyone to be happy.

With the role of the Great Wall, the contact between the farming people and the nomads is becoming more and more frequent, and the culture and ideas of the farming peoples have imperceptibly influenced the nomads on the grassland, so that the nomads are very yearning, and then began the process of sinicization, and the direct benefit of this process is the unification of the world, whether it is the farming people in the south of the Great Wall, or the nomads in the north of the Great Wall, they have finally become people of a country, such as the Tang Empire. Far, far north of the Great Wall is the land of the Tang Dynasty, and there are no enemies in the entire north.

In this case, the existence of the Great Wall seems to have little significance, but taking the initiative to demolish the city wall is also a matter of energy and wealth, so even if the Great Wall has little effect, it will not be actively demolished, and it is also a very good cultural attraction to put there.

In addition, although the Great Wall is already a city wall within the Tang Dynasty, there are still some ambitious people among the nomads in the north who are attached to the Tang Dynasty, and they are not sincere, but because of the strong force of the Tang Empire and have to be attached, and in case there are some problems within the Tang Dynasty, then, these nomads who have not been attached for a long time are very likely to rebel, and An Lushan of the Historical Mountain is a descendant of a nomadic people, after he was attached to the Tang Empire, he was named a very powerful festival envoy, But after seeing that the Tang Dynasty had been defeated by Nanzhao many times, he resolutely decided to rebel against the Tang Dynasty, which caused great losses to the Tang Empire, so that the Tang Empire began to decline from then on, and it could no longer slow down until the moment of destruction.

Therefore, in the key position, the Great Wall not only can not be demolished, but also has to carry out a certain degree of maintenance, only those city walls that are really not needed, will be left to fend for themselves, no longer spend money on construction or maintenance.

"Every section of the wall of the Great Wall is built by the common people with sweat, there are too many stories to tell, just now I said the story of Meng Jiangnu crying on the Great Wall, and there are many, many similar stories, do you want to hear it?"

Ang Lee asked.

Li Hanlu nodded with a smile and said, "Of course I want to hear it, my husband will say a few listens." ”

Li An thought for a moment and said, "Then let's tell a few stories first!" The first story is the Ice Tunnel Stone ......"

Legend has it that a long, long time ago, the emperor asked craftsmen to build a tall Guancheng in a certain location of the Great Wall, in order to ensure the solidity of the Guancheng, the stones used in the Guancheng are all long and heavy stones, which are chiseled one by one on a stone mountain, these stones are very heavy and heavy, four or five people can not lift, the vehicle can not be pulled, and the mountain is high and the road is far away, it is very difficult to transport, which can be anxious for the craftsmen, seeing that the midwinter season is coming, but the big stones on the mountain are piled up more and more, None of them could be transported to the location of Xiuguan City.

If the construction period is delayed, no wages are a trivial matter, and even a small life can not be saved, many craftsmen are sighing for a long time, I don't know what to do, suddenly there is a muffled thunder on the top of the mountain, a splendid picture floats down from the white clouds, the craftsmen hurriedly catch it, only to see a few lines of words looming above, everyone suddenly realized after reading, and operated according to the instructions.

When the winter temperature comes, everyone builds a road from the mountain to Guancheng, and splashes water on the road, under the blowing of the cold wind, the road quickly forms a thick layer of ice, and then, put the stone strips on the ice road to slide and transport, the result is very smooth to transport the long and heavy stones to the Guancheng, not only does not delay the construction period, but saves a lot of construction period, the craftsmen in order to thank God for the protection, build a temple near the Guancheng, worship the gods, and become the craftsman must visit the place after leaving the teacher.

This little story reflects the wisdom of the Chinese people, when the Great Wall was built, it was with these wise people that the Great Wall was built quickly and well, and the task was completed with quality and quantity.

After listening to the first story, Li Hanlu suddenly thought of the fact that Li An had used ice and snow and skis to break the soldiers and horses of their tribe, and what Li An took at that time was to use the ice and snow of nature to give his soldiers and horses a great advantage, so that the speed of the infantry surpassed that of the cavalry, so that they could fight more easily, so that the nomadic cavalry was helpless.

After being praised by Li Hanlu for a few words, Li An continued to tell the next story, which is called Dingcheng Brick.

This story is even more interesting, when told, Li An deliberately modified the time, after all, this story is the story of the Ming Dynasty, at the moment it is still the Tang Dynasty, tell the story behind, naturally to modify the time, it is said that there was a craftsman named Yi Kaizhan at that time, he is proficient in the ninety-nine algorithm, all buildings, as long as he calculates, the labor and materials are very accurate and economical, the supervision of the supervision of the repair is a little disbelieving, let him calculate how many bricks are needed to build the pass, after detailed calculations, this Yi Kaizhan after detailed calculations, telling the superintendent that ninety-nine thousand nine hundred and ninety-nine bricks are needed.

The superintendent naturally didn't believe it, but he could only prepare the bricks according to Yi Kaizhan's requirements, and told Yi Kaizhan that if he found that there was one more or one less brick during the construction, he would have his head cut off and all the craftsmen would be punished with three years of hard labor.

In the end, after the completion of the project, it was found that there was an extra brick, which was placed on the city gate tower, and after the superintendent found out, he was very happy and felt that this was a good opportunity, at least he could deduct the wages of Yi Kaizhan and the craftsmen, but Yi Kaizhan did not hurry to tell the superintendent that this extra brick was not really redundant, but was put by the gods, and it was a brick for the city, and if it was moved, the city tower would collapse.

Although this is a bluffing nonsense, when the supervisor heard it, he didn't dare to pursue it again, and he didn't dare to let people move this extra brick, after all, if something happened, his head would be lost, and he didn't want to take such a big risk.

"Husband, the courage of this supervising person is really too small, others say a word casually, and he believes it, this is the same as Meng Jiangnu crying on the Great Wall, it is all a lie."

After listening to the story of Dingcheng bricks, Li Hanlu said with a smile.

"Dingcheng bricks are indeed a trick to deceive, however, the matter of supervision consideration, is not only the truth of this matter, but the impact it will have on himself, even if he is bolder, let people move the excess bricks away, the city wall has not collapsed, but the city is used to defend the nomads to the south, in case one day the nomads go south to break through the city, the people and property in the pass are looted, so, although this matter has nothing to do with the steward, it is the border general who is not effective in guarding, but the border general in order to escape the sanctions, It is very likely that the blame will be put on the steward, let's just say that when the defense was made, something strange suddenly happened to the city wall, because the bricks of the city were moved, so the emperor in order to calm down the matter, he will naturally take the steward's knife, so that the steward will not be unlucky. ”

Li An said.

Li Hanlu nodded and agreed: "What the husband said is that the person in charge is not timid, but very shrewd!" ”

"That's right, there is no one who is not shrewd in everything, especially a small official with a small official position, who is even more shrewd, otherwise he will not be able to gain a foothold in officialdom."

Ang Lee opened his mouth and went on to tell the following story.

First of all, I told a story about a goat carrying bricks, about the construction of the city wall on the ridge, because to build dozens of pavilions of different sizes and numerous battlement walls on the ridge, the number of bricks used is very amazing, and at that time, the construction conditions were very poor, there was no lifting equipment, and it was all carried by hand. At that time, the bricks used to repair the city were fired forty miles away. After the bricks are burned, they are pulled under the gate by ox cart and then carried up by hand. Because of the height of the city, the only horse road that can go up and down has a large slope, it is very difficult to go up and down, although many people were sent to carry bricks on the city wall, all of them are tired to death, but the bricks on the back are still in short supply, and the progress of the project has been seriously affected, at this moment, a child who herds sheep came here to herd sheep to play, saw this scene, he had an idea, untied his belt, tied a brick at each end, put it on the goat, and then, patted the sheep's back with his hand, the light goat, carried the bricks and trotted up the city wall, people saw it and were surprised and delighted, They followed suit, and a large number of bricks were soon transported to the city walls.

This story is also a very good reflection of the wisdom of the people at the bottom, in the terrain is not good, it is difficult for people and horses to pass, and the vehicles can not pass, but the climbing ability of goats is far beyond humans, and even on the cliffs can walk freely, the use of goats to transport bricks up the mountain is undoubtedly a very good way, can be a good solution to the difficulties of transportation, and such a good way, but also ordinary people in practice step by step summed up, is the crystallization of the wisdom of the working people.

It is said that in the Spring and Autumn Period and the Warring States Period before Qin Shi Huang, there was a Yan King, his land was small, the soldiers and horses were few, and the strength was weak, and there was a danger of being eaten by neighboring countries at any time, in order to keep the land, the Yan King requisitioned the people and built a high city wall on the top of the mountain on the border of his territory to prevent foreign invasion.

Because there was no lime at that time, the stone and bricks of the city wall he built were all plastered with mud, and in order to rush time and repair the city wall as soon as possible, he ordered that the work should not be stopped in winter, and when it was cold, the mud had to be hot, so the people carried the big iron pot to the construction site, supported it with three stones, and added firewood to boil water.

After a long time, the iron pot was burned into a big hole, and all the water in the pot leaked, and the fire under the pot was extinguished. But the people also unexpectedly found that the water was sprinkled on the stones of the pot, and the hot stones exploded when they encountered the water, and many white noodles were blown up.

The next day, the people found that the stone strips and brick joints plastered with this white flour were much stronger than those plastered with mud, and the Yan people were inspired to burn lime to wipe the cracks of the city wall.

Later, Qin Shi Huang unified China, in order to make the Chinese nation not conquered by the Huns, but also imitated the method of King Yan to build the Great Wall, when the construction started, he issued an edict, let the original Yan people take over the work of burning lime, therefore, at that time the lime used to build the Great Wall, all the Yan people burned, where the Great Wall was repaired, where the ash was burned on the hillside, and the quality of the burned ash was very good, it was called Wannian ash by later generations, which means that it will not deteriorate for ten thousand years.

After the Great Wall was completed, the other people went back to various places. Because of the meritorious work of the Yan people in burning ashes, Qin Shi Huang pulled out the gold and silver and built a town, which was specially inhabited by the Yan people, and this town was Yanjing, which was the capital city of China in later generations.