Of a place: occupied or surrounded by armed troops (also figuratively).
Subject to or troubled by attacks, controversy, or pressure.
Having an upper edge or outline of alternating square indentations and extensions like battlements, unless the embattled item is a pale, cross or saltire, in which case it has the crenelations on all sides.
Of a place: strengthened so as to withstand attacks; fortified.
Armed or prepared for battle (literally or figuratively).
Of a fortress or other building, a wall, etc.: having battlements or crenellations; battlemented, crenellated.
Resembling or characteristic of a soldier.