embattle

Short definition from Wiktionary

Verb

1. 1
   To arrange in order of battle; to array for battle.
2. 2
   To prepare or arm for battle; to equip as for battle.
3. 3
   To be arrayed for battle.
4. 4
   To furnish with battlements; to give the form of battlements to.

Noun

1. 1
   A merlon, or a single one of the series of solid projections of a battlement.