What is the meaning of Contravallation?

(n.) A trench guarded with a parapet, constructed by besiegers, to secure themselves and check sallies of the besieged.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). Contravallation. Retrieved September 20, 2026, from http://smartdefine.org/contravallation/definitions/1991111
ChicagoWebster's. 2011. "Contravallation" http://smartdefine.org/contravallation/definitions/1991111 (accessed September 20, 2026).
HarvardWebster's 2011, Contravallation, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/contravallation/definitions/1991111>.
MLAWebster's. "Contravallation" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/contravallation/definitions/1991111>