Hadrian's Wall, built across north Britain between AD 120 and 130, had a system of small forts called milecastles placed every mile along its entire length (80 Roman miles or 73.5 modern miles), with towers or turrets every 1/3 mile. Except for a few decades in the mid 2nd century when the Antonine Wall was built in Scotland, Hadrian's Wall formed the Empire's northernmost frontier. This view shows the remains of Milecastle 42 at Cawfields, where a detachment of Roman soldiers overlooked the mostly unconquered terrain to the north. The small fortress held a wooden palisade, guardhouses, and barracks built over the sloping ground surface.
[Fig.1: Milecastle 42 at Cawfields (photo: Athena Review).]
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