A Roman fort which was used to defend a part of a fortified perimeter (eg. Hadrian's Wall) situated every Roman mile along the length of the perimeter, (approximately every 1.5 kilometres). A mile castle was constructed on a rectangular plan covering 300 to 400 square metres, provided with a barrack-room, a store, an oven and a latrine. There were two gates; the inner leading to civilized lands while the outer was provided with turrets, and opened to the barbarian lands. Also known as a castellum.
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