Contramure

In military fortification, a contramure, or countermure, is a wall raised behind another, to supply its place when breached or destroyed.^[1]

The term was also used to refer to an outer wall, built around the wall of a city.^[2]

References

1. ↑ This article incorporates text from a publication now in the public domain: Porter, Noah, ed. (1913), Webster's Dictionary, Springfield, Massachusetts: C. & G. Merriam Co. 
2. ↑  This article incorporates text from a publication now in the public domain: Chambers, Ephraim, ed. (1728). "^{article name needed}". Cyclopædia, or an Universal Dictionary of Arts and Sciences (first ed.). James and John Knapton, et al.