First, Qin Changcheng.
In the 26th year of Qin Shihuang (22 1 year), Qin annexed six countries, unified the world and established the first unified multi-ethnic centralized country in China history. In order to maintain and consolidate the unprecedented unity and security of the Great Empire, Qin Shihuang successively adopted a series of major strategic measures for national defense construction and frontier defense, one of which was the large-scale construction of the Great Wall of Wan Li.
In the thirty-second year of Qin Shihuang (2 15), General Meng Tian led 300,000 troops to attack the Huns in the north and took the land of Henan. Later, the Great Wall was built, winding from Lintao (now Shanni County, Gansu Province) in the west to Liaodong (now Liaoning Province) in the east for more than 10,000 miles. Since Qin Shihuang built the Great Wall, it has been called the Great Wall of Wan Li.
Second, the Great Wall of Han Dynasty
At the beginning of the Han Dynasty, the Huns took advantage of the Han War to cross the Great Wall built by Meng Tian, the general of Qin Dynasty, and confronted the Great Wall of Qin, Zhao and Yan during the Warring States Period. Due to the disrepair of the Great Wall, there are few defenders in the north, and the powerful Xiongnu constantly enter the Great Wall to plunder. However, even such a dilapidated Great Wall has played a role in military defense to a certain extent.
Cheng Wu is a famous soldier stationed in the Great Wall, and he is strict in running the army. As long as he guards the Huns, he won't dare to attack. Later, Wei Qing, Huo Qubing, GongSunHe, Gong and others attacked the Huns, all of which were based on Qin and Zhao Changcheng.
Third, the Great Wall of Tang Dynasty.
For a long time, people have come to the conclusion that there was no Great Wall in the Tang Dynasty. The Great Wall was built in the Tang Dynasty, but it was built for the purpose of unifying the war, which is different from the traditional "rejecting the Great Wall of Hu". "Geography of the New Tang Dynasty Book" contains: Taigu County, Shanxi Province, "There is the Great Wall in Maling, 80 miles southeast, from Pingcheng to Lukou, 300 miles, and Zhenguan was abandoned in the year."
The site of the Great Wall of Tang Dynasty is closed from Malingguan along Maling (that is, to the west of Guancun, a modern commune), from Guanguan to Shiyuan Village, Yushe County, to Huanghuagou, to Shi Hui Village, Pipayao Village and Jiaohongmiao Village, and finally to Yicheng, heshun county.
Fourth, the Great Wall of Ming Dynasty.
The Great Wall of Ming Dynasty is a military defense project built in the northern part of Ming Dynasty, also known as the side wall, which is different from the Great Wall of Wan Li built by Qin Shihuang.
In the Ming Dynasty, the "inner" Great Wall and the "inner three passes" Great Wall were built outside the "outer" Great Wall. The "interior wall" starts from Pianguan at the junction of Inner Mongolia and Shanxi in the west, enters Hebei at Yanmenguan and Xing Ping in the east, then goes to the northeast, passes through Yuanyuan, Fangshan and Changping counties, reaches Juyongguan, and then reaches Huairou No.4 Pass from north to east, and is connected with the "Outer" Great Wall, with Zijingguan as the center, generally showing a north-south trend.
The "Neisanguan" Great Wall is parallel to the "Inner" Great Wall in many places. In some places, the two cities are only tens of miles apart. In addition, a large number of "heavy cities" have been built, and there are 24 "heavy cities" around Yanmenguan.
Extended data
The Great Wall, also known as the Great Wall of Wan Li, is an ancient military defense project in China. It is a tall, solid and continuous long wall, which is used to limit the enemy's actions. The Great Wall is not a simple isolated wall, but a defense system with the wall as the main body and a large number of cities, obstacles, pavilions and landmarks.
The history of the construction of the Great Wall can be traced back to the Western Zhou Dynasty, and the famous allusion "bonfire drama princes" happened in Haojing, the capital (now Xi 'an, Shaanxi) originated from this. During the Spring and Autumn Period and the Warring States Period, countries competed for hegemony and defended each other, and the construction of the Great Wall entered its first climax, but the construction length at this time was relatively short. After Qin destroyed the six countries and unified the world, Qin Shihuang connected and repaired the Great Wall of the Warring States Period, which was called the Great Wall of Wan Li. The Ming Dynasty was the last dynasty to overhaul the Great Wall, and most of the Great Wall seen by people today was built at this time. ?
Great Wall resources are mainly distributed in Hebei, Beijing, Tianjin, Shanxi, Shaanxi, Gansu, Inner Mongolia, Heilongjiang, Jilin, Liaoning, Shandong, Henan, Qinghai, Ningxia, Xinjiang and other provinces, autonomous regions and municipalities. Shaanxi Province is the province with the richest resources of the Great Wall in China, with a total length of 1838 km. According to the results of the national Great Wall resources survey conducted by cultural relics and surveying and mapping departments, the total length of the Great Wall in Ming Dynasty was 885 1.8km, and it was more than 1 1,000 km in Qin and Han Dynasties and its early period, and the total length was more than 2 1 1,000 km. ?
196 1 On March 4th, the Great Wall was announced by the State Council as the first batch of national key cultural relics protection units. 1987 65438+February, the Great Wall was listed as a world cultural heritage.
Baidu Encyclopedia-Great Wall (the first military project in ancient China)