The Collaborative International Dictionary of English v.0.48:

Embattle \Em*bat"tle\, v. t. [imp. & p. p. Embattled; p. pr. &
   vb. n. Embattling.] [OF. embataillier; pref. em- (L. in) +
   F. bataille battle. See Battle, and cf. Battlement.]
   To arrange in order of battle; to array for battle; also, to
   prepare or arm for battle; to equip as for battle.
   [1913 Webster]

         One in bright arms embattled full strong. --Spenser.
   [1913 Webster]

         Here once the embattled farmers stood
         And fired the shot heard round the world. --Emerson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Embattled \Em*bat"tled\, a.
   1. Having indentations like a battlement. [Obs.] --Chaucer.
      [1913 Webster]

   2. (Her.) Having the edge broken like battlements; -- said of
      a bearing such as a fess, bend, or the like.
      [1913 Webster]

   3. Having been the place of battle; as, an embattled plain or
      field. --J. Baillie.
      [1913 Webster]

WordNet (r) 3.0 (2006):

embattled
    adj 1: prepared for battle; "an embattled city"
    2: having or resembling repeated square indentations like those
       in a battlement; "a crenelated molding" [syn: embattled,
       battlemented, castled, castellated]