Fortlet
A small fort for a moderately sized garrison - but not so large as to hold a full unit of soldiers, such as a cohort or legion. Usually spaced about a day's march from another military base they may be outposts or with a specific function, such as guarding a bridge or road. Examples of fortlets guarding roads are at Chew Green (phases II and IV), for Dere Street, and Haltwhistle Burn for the Stanegate, (see Hadrian's Wall), both Northumberland.
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