communication trench 
  | trench that linked the front line to the reserve lines. Used for moving troops and supplies to and from the front line.  | 
Flamenwerfer 
  | flamethrower  | 
high explosive 
  | an explosive that has a very rapid reaction time, ie explodes very quickly  | 
impregnable 
  | not able to be taken by force  | 
latrine 
  | toilet  | 
parados 
  | bank of earth behind a trench to prevent an attack from the rear  | 
parapet 
  | protective bank at the front of the trench  | 
Stokes bomb 
  | a type of trench mortar, named after its inventor, Wilfred Stokes  | 
synonymous 
  | same or similar  | 
vantage point 
  | a position which gives a good view of the surroundiung area  |