Source : Webster's Revised Unabridged Dictionary (1913)

Battalia \Bat*tal"ia\, n. [LL. battalia battle, a body of
   troops. See {Battle}, n.]
   1. Order of battle; disposition or arrangement of troops
      (brigades, regiments, battalions, etc.), or of a naval
      force, for action.

            A drawing up the armies in battalia.  --Jer. Taylor.

   2. An army in battle array; also, the main battalia or body.
      [Obs.] --Shak.