In military

fortification A fortification (also called a fort, fortress, fastness, or stronghold) is a military construction designed for the defense of territories in warfare, and is used to establish rule in a region during peacetime. The term is derived from Lati ...

, a contramure, or countermure, is a wall raised behind another to supply its place when breached or destroyed. The term was also used to refer to an outer wall built around the wall of a city.

References

Fortification (architectural elements) {{fort-stub