#munition__fortification  defensive structure consisting of walls or mounds built around a stronghold to strengthen it
  supertype:  #defensive_structure__defensivestructure__defense  a structure used for defense; "the artillery battered down the defenses"
  part:  #rampart
  subtype:  #bastion.munition  projecting part of a rampart or other fortification
  subtype:  #bunker__dugout  a fortification of earth; mostly or entirely below ground
     subtype:  #foxhole__fox_hole__foxhole  a small dugout with a pit for individual shelter against enemy fire
     subtype:  #funk_hole  dugout as a place of safe retreat (when in a funk)
  subtype:  #castle  a large building formerly occupied by a ruler and fortified against attack
  subtype:  #defilade  the arrangement of defensive fortifications to protect against enemy fire
  subtype:  #entrenchment__intrenchment  an entrenched fortification; a position protected by trenches
     subtype:  #retrenchment  entrenchment consisting of an additional interior fortification to prolong the defense
  subtype:  #escarp__escarpment__scarp__protective_embankment  a steep artificial slope in front of a fortification
  subtype:  #fieldwork  a temporary fortification built by troops in the field
  subtype:  #lunette  temporary fortification like a detached bastion
  subtype:  #Maginot_Line  a fortification built before World War II to protect France's eastern border; initially considered to be impregnable it was easily overrun by the Germans in 1940
  subtype:  #palisade  fortification consisting of a strong fence made of stakes driven into the ground
  subtype:  #parapet__breastwork  fortification consisting of a low wall
     subtype:  #machicolation  a projecting parapet supported by corbels on a medieval castle; has openings through which stones or boiling water could be dropped on an enemy
  subtype:  #Siegfried_line  German fortifications facing the French Maginot Line
  subtype:  #stockade  fortification consisting of a fence made of a line of stout posts set firmly for defense

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