A sapper, in the sense first used by the French military, was one who sapped (undermined) another's fortifications.
Royal Engineers Indian Army Corps of Engineers Combat engineering Madras Engineer Group Bengal Engineer Group President's Hundred Tab Bombay Engineer Group Sapper Tab PAVN NLF and PAVN strategy, organization and structure Sapeur-pompier H. C. McNeile Commandos (series) NLF and PAVN battle tactics Special Forces Tab Birdsong (novel) NLF and PAVN logistics and equipment Paris Fire Brigade Sapping Khe Sanh (song) Fort Leonard Wood, Missouri Royal Australian Engineers Canadian Military Engineers Zigzag Ranger Tab National Guard (France) Icewind Dale Malazan Book of the Fallen Raid (military) The English Patient Warcraft II: Tides of Darkness Age of Empires II: The Age of Kings Sebastian Faulks Vietnam veteran Patrol Cold Chisel Urban warfare Vauban National Front for the Liberation of South Vietnam Military engineer