For the tunnel attack (Cao) exercise, the inside is a long graben to refuse. —— "Zizhi Tongjian"
preface
Speaking of the Great Wall, I believe that no one will be unfamiliar, such as "Beacon Theatre Princes", "Mengjiang Girl Crying Great Wall" and so on are stories that occur around the Great Wall. As a world cultural heritage, there are also many verses praising the Great Wall in ancient poems, as an important military defense project in ancient times, it is not only a symbol of human wisdom, but also a magnificent architectural miracle. In addition to the Great Wall, there is also a miracle "Underground Great Wall" buried deep underground.
Cao Cao's underground military battle route
At the end of the Eastern Han Dynasty, Cao Cao, as a generation of tyrants, always had the ambition to dominate the Central Plains. At that time, the society was very turbulent, and the princes of all walks of life also frequently waged wars for their own power. In order to win the war, the requirements for military strength were very high, and based on this situation, Cao Cao also built an underground fortress.
The main purpose of the underground Great Wall built by Cao Cao was to develop his military strength, and the underground Great Wall was centered on the head of Osumi and extended to all sides. The passages to various places are all made of artificial construction, and the entire tunnels are crisscrossed and can be reached in all directions to the outside of the city, and the survey found that the road for transporting troops is more than 4,000 meters long.
Confuse the enemy to win by surprise
Cao Cao's underground Great Wall is located in Bozhou City, Bozhou is Cao Cao's hometown, when Cao Cao built this military road, in order to be able to win a surprise victory on the battlefield. There are many things that can be done in the Military Transport Road, and Cao Cao's recruitment and trading, grain and grass transportation and other work were secretly completed here.
Moreover, this kind of access can be obtained from the city to the outside of the city, and it can also play a surprising role in winning the war. Cao Cao could not only hide his army in the passage, making it difficult for outsiders to know his true military strength, but also encounter a siege, and also transport soldiers outside the city through this passage, and the inside and outside should take advantage of the war.
Buried deep underground for more than 700 years
Although it is difficult to find records of this military transportation road in the history books, this underground Great Wall was used in many dynasties after the Eastern Han Dynasty. As a military war road, it was repaired many times during the Tang and Song dynasties, and the city of Bozhou was flooded during the Southern Song Dynasty, resulting in this military road being buried in the ground.
After this, this "underground Great Wall" was buried for more than 700 years, and after the founding of the People's Republic of China, in response to the country's call to "dig deep holes and accumulate grain", the whole country launched a boom in digging air raid shelters. The people of Bozhou participated in the digging of air raid shelters, and soon excavated the remains of the "Underground Great Wall" in many places. Finally, with the help of historians, the deeply buried Cao Cao's military road was able to see the light of day.
summary
The total length of this "underground wall" is more than 8,000 meters, and the internal structure is obviously different, and it can be seen from these differences that this passage was used in many dynasties, and it was expanded and adjusted according to the situation at that time. In particular, each turn is designed to be T-shaped, which is very suitable for both transporting troops and transporting grain and grass.
Today, the "Underground Great Wall" has become the main tourist attraction of Bozhou City, and there are many military facilities such as cat ear holes, obstacle tickets, barrier walls, traps, trip boards, and command rooms. Many people who come to Bozhou come here to take a look and feel the majesty of the underground Great Wall.
【References】Zizhi Tongjian, Romance of the Three Kingdoms
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