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From: Webster's Revised Unabridged Dictionary (1913)

 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.