#entrenchment__intrenchment  an entrenched fortification; a position protected by trenches
  supertype:  #munition__fortification  defensive structure consisting of walls or mounds built around a stronghold to strengthen it
  subtype:  #retrenchment  entrenchment consisting of an additional interior fortification to prolong the defense
  part:  #trench  a ditch dug as a fortification having a parapet of the excavated earth

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