The Collaborative International Dictionary of English v.0.48:

Battalia \Bat*tal"ia\ (b[a^]t*t[=a]l"y[.a]; 106), 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.
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            A drawing up the armies in battalia.  --Jer. Taylor.
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   2. An army in battle array; also, the main battalia or body.
      [Obs.] --Shak.
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