guerrilla


guerrilla (http://definr.com/guerrilla)

     adj : used of independent armed resistance forces; "guerrilla
           warfare"; "partisan forces" [syn: guerrilla(a), guerilla(a),
            underground, irregular]
     n : a member of an irregular armed force that fights a stronger
         force by sabotage and harassment [syn: guerilla, irregular,
          insurgent]