Sapper

from WordNet (r) 3.0 (2006)

sapper
    n 1: a military engineer who lays or detects and disarms mines
    2: a military engineer who does sapping (digging trenches or
       undermining fortifications)

from The Collaborative International Dictionary of English v.0.48

Sapper \Sap"per\, n. [Cf. F. sapeur.]
   One who saps; specifically (Mil.), one who is employed in
   working at saps, building and repairing fortifications, and
   the like.
   [1913 Webster]

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