The wasteland on both sides of the road has been abandoned for decades, so much so that even the most basic weeds and the remains of crops can be found, and only the occasional ridges can be seen, so that it can be determined that this was once farmland, the soil on which the common people depended.

The change of environment has made the climate here drier and drier, there is almost no trace of moisture in the air, and it feels a little uncomfortable to breathe the air here, and the sand and dust raised from time to time can easily enter people's mouths and noses, which makes people quite uncomfortable.

That is, the distance of more than ten miles of road, just now it was still full of green trees, and in the blink of an eye, it has become a desert with no grass, and the huge changes in this environment are too great, making it difficult for people to adapt for a while.

However, after a certain period of distance, trees appeared on both sides of the road, which shows that Dejing County is not far away, and there must be water sources around the county, otherwise, this county town will not be able to exist.

Sure enough, soon there were more and more vegetation on the roadside, and even farmland began to appear, and a tall city could be seen faintly in the distance, and Dejing County was already close at hand.

"Li Shilang, Dejing County is almost here, is it an advanced city?"

The guard asked.

Li An shook his head and said: "Forget it, I won't go, this time I came to see the ruins of the Great Wall, so I won't enter the city, and go directly to the ruins of the Great Wall of Qin in Erlidi, west of Dejing County." ”

"Yes, my subordinates understand."

When he came, he didn't notify anyone, so no one would go out of the city to greet him, which was in line with Li An's wishes, he didn't want the county officials to greet him, it was really troublesome.

The convoy went straight to the ruins of the Great Wall of Qin, two miles west of the city, and soon arrived there.

However, Li An was a little disappointed, the Great Wall in his imagination should be very tall and majestic, and the Great Wall in front of him seemed a little low, and it was still very dilapidated.

"This is the site of the Great Wall of Qin? It looks too broken. ”

Ang Lee said disappointedly.

"It's the Great Wall that has been abandoned, and it's good to have it like this."

Li Hanlu replied.

Li An nodded, let the guards casually enjoy the surrounding scenery, and then pulled Li Hanlu onto the dilapidated city wall.

"Madame, be careful, watch your step, don't fall."

Li An was very intimate and helped Li Hanlu to walk up to the Great Wall ruins.

Although the ruins of the Great Wall are somewhat dilapidated, the quality is relatively reliable when they were manufactured, so even if they are damaged, the quality is enough to support humans to walk on them without collapsing.

Like Tongwan City, the Great Wall here is also built with loess, which is very different from the stone city wall in Li An's impression, after all, the loess resources in Xiazhou are relatively sufficient, and the stone resources are relatively very scarce, in order to save costs as much as possible, it is necessary to use loess to build the city, so whether it is a tall city here, or the Great Wall that has been built, the loess materials that can be seen everywhere are used.

Compared with the solidity of the loess material, it is naturally worse, especially in terms of resisting the sun and rain, the advantage of the stone is too great, and the loess is difficult to withstand the erosion of the rain, and the resistance to the sun and the wind is also inadequate, so that it is easier to weather, if it is not repaired in time, the whole wall will slowly be scrapped, thus becoming a deserted city wall.

The section of the city wall that Li An and Li Hanlu climbed was only more than three meters high, and its original height should be more than that, it was a long-term exposure to the sun, rain and weathering, which gradually reduced the height of the city wall.

"Look! This is the Great Wall of the Great Qin Empire, although it is dilapidated at the moment, but when it was first built, it was also very tall. ”

Li An looked to the north and spoke.

The Great Wall of Qin is a treasure of the Chinese nation and a miracle of world architecture, and it is called a miracle because the scale of the Great Wall is too large, and the Chinese people can use primitive technology to build such a huge building, which naturally makes future generations sigh.

"It's just a wall, where would there be enough troops to defend such a long wall, wouldn't it be a waste to build a wall of this size."

Li Hanlu is not very optimistic about the Great Wall, and feels that the construction of the Great Wall is a waste of money and a waste of resources, because she feels that such a length of the city wall cannot stop the northern soldiers from going south, and the facts seem to prove this.

However, it is not that the Great Wall is completely useless, it is still somewhat useful, its presence can strengthen the defense of the Central Plains Dynasty, as long as the strength of the northern nomads is not too strong, it will not pose a threat to the Great Wall.

In addition, the ruling institutions of the northern nomads are relatively loose, and in many cases, the leaders of the northern nomads are simply unable to effectively manage all the tribes under their command, and some tribes are likely to disobey the orders of the leaders and wantonly invade the south.

For example, dozens of people, hundreds of small-scale nomadic cavalry, from time to time will invade the Central Plains counties, plunder a large number of people and property, and then return to the grassland contentedly, like this large number of small-scale southward incursions, is very harmful to the Central Plains Dynasty convenience of the people, and after the construction of the Great Wall, these small-scale nomadic cavalry can do nothing, their number is too small, even if they want to demolish a section of the city wall, it is not possible to do it in a short time, and, when they loot, they must also go back from this dismantling opening, and if this place is blocked, it is very likely that they will not be able to go back, so naturally they will not dare to go south to invade at will.

As for the large-scale nomadic cavalry to the south, the Great Wall also has a strong defensive power, it is not easy to build the Great Wall, the same way, the demolition of the Great Wall will not be too simple, after the nomadic army demolishes a few sections of the city wall, when going back, it must also go back from these places, and can not return from any direction to the north at will, it is very restricted, and the demolition of the city wall is time-consuming and laborious, it will certainly not be demolished too wide, and the opening is too small, the speed of the army will be greatly limited, As a result, the swiftness of the army's actions was delayed, and once the opening to return was blocked, and the soldiers and horses of the Central Dynasty pressed again, these nomadic cavalry were in danger.

Therefore, no matter what, the existence of the Great Wall definitely has a great role, and its role in defense is obvious, and no one can ignore the important defensive role of the Great Wall.

The construction of the Great Wall definitely did not start from the Qin Dynasty, and the construction of the Great Wall had already begun during the previous Spring and Autumn Period and the Warring States Period.

At that time, the construction of the Great Wall was the most active, that is, the Qin State, the Zhao State and the Yan State, these three countries were all in the north of the powerful countries, they were deeply disturbed by the northern nomads, Qin in the north of the Yiqu and Xiongnu; In the northwest of Zhao State, there are Linhu and Loufu, and in the north, there are Ragged and Xiongnu; There is Donghu on the northern boundary of Yan Kingdom.

Since the middle of the Warring States period, they have continuously plundered the northern regions of the Qin, Zhao, and Yan kingdoms. Because they are good at riding and shooting, they are good at field warfare, take surprise attacks, come and go, are elusive, and show strong combat effectiveness. The combat troops of Qin, Zhao, and Yan in the middle of the Warring States period were mainly infantry and chariots, wearing clothes with wide clothes and large sleeves, moving slowly, and traveling 30 to 50 miles a day, so naturally they could not stop the attacks and plundering of the Xiongnu and Donghu.

This not only seriously threatened the lives and property of the people in the north of the three countries, and seriously damaged production, but also greatly affected the cause of the three countries to compete for hegemony.

Of course, in the face of the threat of nomads, it is obviously not enough to build the Great Wall alone, but also to change the military system and form a new powerful army to deter the Xiongnu in the north, and at the same time, it can also deter opponents competing for hegemony.

For example, after the Shang Dynasty changed the law, the Qin State began to implement the strategy of enriching the country and strengthening the army, and the army carried out in-depth reforms, changing the original chariot soldiers to cavalry and infantry, especially focusing on the construction of cavalry, so as to build a powerful Great Qin Iron Cavalry step by step.

Zhao Wuling King of Zhao State, also reformed the military system, let the domestic soldiers wear Hu people's clothes, and carried out strict cavalry training, which is called Hu Fu cavalry archery in history, and after this strategy, Zhao soon appeared an extremely powerful cavalry corps, Zhao Wuling King relied on this super cavalry corps, first attacked to the north, and fought the nomadic Lin Hu all over the ground to find teeth, Lin Hu Wang sacrificed his horse and begged to surrender, and then, this cavalry corps broke through Zhongshan and expanded the territory of Zhao State, and then it was step by step to conquer the south and the north. It laid a large piece of land for the Zhao State.

Yan is the weakest of the seven heroes of the Warring States, the south is the powerful Qi State, the west is the powerful Zhao State, and there is a nomadic regime like Donghu in the north, the living environment can be described as extremely bad, in order to change this passive situation, so that they can survive, Yan State first grovelled to please the Donghu in the north, let the generals go to Donghu as hostages, so as to understand the dangers of the mountains and rivers of Donghu, the deployment situation, the law of army activities, after returning to China, he led the army to attack Donghu, and defeated Donghu, Later, in order to defend against the retaliation of Donghu, the Great Wall was built on the northern border to protect the security of the country.

Of course, the Great Wall of the Spring and Autumn Period and the Warring States Period was not only the Qin, Zhao and Yan Kingdoms, but also many countries in the south and the east and COSCO.

For example, the southern power of Chu, in order to defend its neighbors and built a large-scale Great Wall, Qi also built a long wall in order to defend the Central Plains neighbors, the Great Wall of Wei is even more powerful, there are as many as two, and the route is also very long, after all, Wei is located in the Central Plains, there are many countries to defend, and there is a great demand for the Great Wall, South Korea also has a section of the Great Wall after the defeat of Zheng State, and Zhongshan State built the Great Wall in order to defend against Zhao.

However, the scale and fame of these Great Walls are far inferior to those of the Three Kingdoms of Qin, Zhao and Yan, and the main reason for this is that after the Great Qin Empire unified the world, it mobilized a large number of people to connect the Great Wall of the Three Kingdoms of Qin, Zhao and Yan together, making it the northern border of the COSCO Dynasty, which can continue to be repaired and maintained, while the rest of these Great Walls, because they are within the territory of the unified COSCO Dynasty, so the importance does not exist, and it will not get the slightest repair funds, and it will slowly be destroyed naturally. Some were demolished by nearby officials and people, and their materials were used to build the buildings they needed, so there was almost no preservation in later generations, only the Great Wall of the Qin, Zhao and Wei Kingdoms, because it had to resist the southward movement of the northern nomads and always existed, and the fame naturally became bigger and bigger, and people would think of the Qin and Wei Kingdoms as long as they saw the Great Wall on the northern border.

At the beginning of the Han Dynasty, due to the war in the Central Plains, the Great Wall was not maintained, and there were not enough troops to defend it, but the Xiongnu suddenly became stronger, so they easily crossed the Great Wall built by Meng Tian and entered the Hetao area.

In order to deal with the southward movement of the Huns, Liu Bangzeng, the ancestor of the Han Dynasty, personally led a large army to attack the Xiongnu, but was besieged during the Baideng period, and if it were not for the courtiers to use tactics, they would have died there.

And then it is the peace policy that all descendants know, in the case of the Great Wall in the north being captured by the Xiongnu, the Han Dynasty can rely on the old Great Wall of Qin, Zhaoyan and Qin, which is slightly south, these Great Walls are very dilapidated, but even the dilapidated Great Wall still plays a lot of roles, at least, the southward movement of the Xiongnu within a thousand people has been basically eliminated, because the southward movement of a small number of troops means that there is no return, and it will be beaten all over the ground to find teeth.

After that, the Han Dynasty produced Li Guang, Cheng Buzhi and other famous Great Wall guards, they were responsible for defending against the raids of the Huns, and the small-scale Huns had no chance to go south, and even if the main force of the Huns went south, sometimes they could be blocked, and if there were no such dilapidated Great Wall, even if it was a famous general like Li Guang, it would not be able to resist the Hun cavalry going south.

After that, Wei Qing and Huo Qubing attacked the Xiongnu in the north, and also used these Great Walls as the main base for attack and defense, with the Great Wall with strong defense, Wei Qing and Huo Qubing who attacked the Xiongnu in the north had no worries, and then defeated the Xiongnu, so that the Xiongnu fled far away from Mobei, so as to recover the Hetao area lost in the early years of the Han Dynasty, repair the Qin Great Wall built by Meng Tian, and also built the Outer Great Wall, so that the prestige of the Han Dynasty spread all over the world.

After the Han Dynasty, various dynasties paid great attention to the maintenance and expansion of the Great Wall, among them, the dynasty with a more powerful expansion was the Great Wall of the Ming Dynasty, which was probably due to the greater threat of the Ming Dynasty from the north!

After all, the territory of the Tang Dynasty has been extended to Mobei, and the Great Wall has become the internal wall of the Tang Dynasty, rather than the side wall to defend against external enemies.