#line_of_defense__line_of_defence  defensive structure consisting of a barrier that can be employed for defense against attack
  supertype:  #defensive_structure__defensivestructure__defense  a structure used for defense; "the artillery battered down the defenses"
  subtype:  #abattis__abatti__abatis  line of defense consisting of a barrier of felled or live trees with branches (sharpened or with barbed wire entwined) toward the enemy

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