Sap roller

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(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.

See also: Sap

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
In the meantime, he was struck in the head by a shell fragment from a SAP roller at Vicksburg, Mississippi, while superintendent of all the approaches, rifle pits and mines in front of Gen.