china kept out the mongols with the Great Wall
China has used the Great Wall as a barrier.
The great wall of china to keep out the Mongolas
it was used to keep out invaders
To keep invaders, lepers, and whoever else they didn't like out!
it was used to keep invaders (xoingnu) out. it took a long time to build it (1368-1644)
Yes, mountains can and often are used as barriers. Mountains can be very tough to cross, making them excellent barriers against attacks.
They can be used to keep foxes out of areas or people and other animals. They can provide a barrier to entry but still allows you some visibility across your property.
It was used when china had invaders coming, this paper money protected them and the Chinese gave the invaders some money to go away.
Used it to keep control and attack other countries
Traffic Cones. Jersey Barriers. Traffic Barrels. Delineators. Frame Barriers.
You can't stop the lava flow the barriers are only used to divert it
Roncevaux Pass was the pass used by armies and invaders in the Basque Pyreness