Contravallation Definition
 käntrəvəlāzhən 
    noun
  
 A fortification set up to protect a besieging force from attack by the defenders of the besieged place or by a relieving force from the outside.
 Webster's New World 
A fortification built around a sieged target by the besiegers.
Wiktionary 
Other Word Forms of Contravallation
Noun
Singular:
 contravallationPlural:
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