Information about the Great Wall Origin

The Great Wall, also known as the Great Wall, is a military defense project in ancient China. It is a tall, strong and continuous wall used to limit the movement of enemy cavalry. The Great Wall is not a simple and isolated city wall, but a defense system with the city wall as the main body and a large number of cities, barriers, pavilions and signs.

Great Wall resources are mainly distributed in 15 provinces, autonomous regions and municipalities including Hebei, Beijing, Tianjin, Shanxi, Shaanxi, Gansu, Inner Mongolia, Heilongjiang, Jilin, Liaoning, Shandong, Henan, Qinghai, Ningxia and Xinjiang. Shaanxi Province is the province with the richest Great Wall resources in China, with a length of 1,838 kilometers of Great Wall.

The history of the construction of the Great Wall can be traced back to the Western Zhou Dynasty. In order to defend against the attacks of the northern nomadic tribes, the Zhou Dynasty built continuous rows of castles "Liecheng" for defense.

In the Spring and Autumn Period and the Warring States Period, in order to compete for hegemony and defend each other, various countries built the Great Wall on their borders according to their respective defense needs. The first one built was the "Chu Fang City" in the 7th century BC. Later, the Qi, Han, Wei, Zhao, Yan, Qin, Zhongshan and other vassal states, large and small, have successively built the "Great Wall of Mutual Defense among the vassals" for self-defense.

Among them, Qin, Zhao, and Yan were adjacent to the Xiongnu, a powerful nomadic people in the north. While building the Great Wall for mutual defense among the princes, they also built the "Great Wall to Reject Hu" in the north. After that, almost all monarchs of the past dynasties reinforced it. build. At this time, the characteristics of the Great Wall were that the east, south, west, and north directions were different, and the length was shorter, ranging from a few hundred kilometers to 1,000-2,000 kilometers.

In order to distinguish it from the Great Wall later built by Qin Shihuang, historians call it the "Pre-Qin Great Wall".

Extended information:

Judging from the existing ruins in Laiwu, Mount Tai and other places, the structure of the Qi Great Wall mainly includes earth construction and stone construction. Wherever the steep cliffs are difficult to climb, only stones are used to build a short stone wall about 2 meters wide, or simply no city is built based on the mountain. Whenever there are ravines, huge stones are used to build them, nearly 7 meters wide, and the stones are mostly tied together. Rough stone is not processed into strips or ashlar, and is not solidified with mortar, but its structure is very particular.

In general areas, it is a combination of earth and stone. Its foundation is made of rough-processed large and small stones, with a width of 8 to 12 meters. The rammed earth is built on top. Each layer is about 10 to 15 centimeters thick. It is neat and uniform, with clear layers. The rammed nests are even and clearly distinguishable. The soil was once mixed with salt water.

There are traces of decayed wood on some sections of the city wall. There may have been logs in the middle of the wall to increase tension and maintain balance. The entire Qi Great Wall is steep on the south and gentle on the north. There are piles of random stones every 5 to 10 meters on the north slope. The big ones are like millstones and the small ones are like rice mills. They were the stones prepared for defending the city against enemies.

Reference: Baidu Encyclopedia-Great Wall