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Sap roller

Source : Webster's Revised Unabridged Dictionary (1913)

Sap \Sap\, n. (Mil.)
   A narrow ditch or trench made from the foremost parallel
   toward the glacis or covert way of a besieged place by
   digging under cover of gabions, etc.

   {Sap fagot} (Mil.), a fascine about three feet long, used in
      sapping, to close the crevices between the gabions before
      the parapet is made.

   {Sap roller} (Mil.), a large gabion, six or seven feet long,
      filled with fascines, which the sapper sometimes rolls
      along before him for protection from the fire of an enemy.
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