Source : Webster's Revised Unabridged Dictionary (1913)

Tactics \Tac"tics\, n. [Gr. ?, pl., and ? (sc. ?, sing., fr. ?
   fit for ordering or arranging, fr. ?, ?, to put in order, to
   arrange: cf. F. tactique.]
   1. The science and art of disposing military and naval forces
      in order for battle, and performing military and naval
      evolutions. It is divided into grand tactics, or the
      tactics of battles, and elementary tactics, or the tactics
      of instruction.

   2. Hence, any system or method of procedure.

Source : WordNet®

tactics
     n : the branch of military science dealing with detailed
         maneuvers to achieve objectives set by strategy