The Collaborative International Dictionary of English v.0.48:

Tactician \Tac*ti"cian\, n. [Cf. F. tacticien.]
   One versed in tactics; hence, a skillful maneuverer; an
   adroit manager.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tactician
    n 1: a person who is skilled at planning tactics