#trench  a ditch dug as a fortification having a parapet of the excavated earth
  supertype:  #ditch  a long narrow excavation in the earth
  subtype:  #approach_trench  #fire_trench  #moat  #slit_trench
  part of:  #entrenchment__intrenchment  an entrenched fortification; a position protected by trenches

No statement uses or specializes #trench; click here to add one.