contravallation

noun
con·​tra·​vallation | \¦kän‧trə+\
plural -s

Definition of contravallation 

: a series of works confronting the walls of an invested place to isolate the defenders and safeguard the besiegers against sallies also : construction of such works

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History and Etymology for contravallation

modification (influenced by Latin contra-) of French contrevallation, from contre- (from Latin contra-) + Late Latin vallation-, vallatio rampart, entrenchment

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