A strong or fortified place; usually, a small fortified place, occupied only by troops, surrounded with a ditch, rampart, and parapet, or with palisades, stockades, or other means of defense; a fortification.
1) An enclosed place or fortified building for military defense, usually equipped with earthworks, guns, a garrison of troops, permanent buildings, etc.: 2) A permanent Army post, as distinguished from a temporary training camp.
A work, garrisoned by troops, established for the defense of a land or maritime frontier, the approach to a town, a harbour, a pass or a river. A fort is generally an enclosed place with walls, stockades, bastions, blockhouses, palisades and outworks, or any combination thereof. In France, Marshal Sebastian le Preste de Vauban (1638-1707), and in Holland, Baron Menno van Coehoorn (1641-1704) established some basic principles for the building (and taking) of forts.