What role did the ancient moat play?

The city wall is a unique and special military and civilian facility invented by ancient people in China, which integrates military, political and cultural aspects. The city is actually two words, the city is the city and the city wall, and the pool is the pool and the moat. Many places, especially the north, dig ditches because of lack of water. This kind of water is called trench.

The moat has the function of self-rescue, which can not only prevent the enemy's fire attack, but also meet the needs of urban water use. It is also an important water conservancy project for flood control and drainage, and some of them can also undertake transportation functions near rivers. The moat can be used not only for military purposes. Digging out the mud in the moat can burn bricks to fill the soil and repair the city wall, which saves even the freight and greatly saves the cost of repairing the city wall.

Extended data:

A moat, also called a city wall, is defined as a river that people dig around the city wall. In ancient times, it was used for defense. It was excavated in ancient times and surrounded the whole city, palaces, temples and other major buildings. It has a defensive function and can prevent the invasion of enemies or animals.

This kind of moat, which is dominated by nature and supplemented by man-made, is more in China and the world. The most typical cities are Nanjing, Xi 'an, Xiangyang, Chongqing, Hengyang, Changde, Ganzhou, Jishui Town and Hotan Town.

Many countries in the world have dug moats in ancient times, such as the Forbidden City in China, the Ming City Wall in Xi 'an, the Ming City Wall in Nanjing, the moat in Jinan (the park around Jinan), the moat in Xiangyang, the ancient city in Hsinchu, Taiwan Province, the old city in Zuo Ying, Huang Jincheng in Yizai, Matsumoto City in Japan, Edo (now Tokyo) and other ancient cities, and even castles and palaces in European countries.

References:

Moat _ Baidu Encyclopedia