@hideki Nice
"Outpost" is a self-contained structure(s) built away from civilization as a safe location to stay in, rest, refuel, as a checkpoint on a frontier or along a route, or to inhabit for an extended period of time for observation of a phenomenon or location.
Think a hunter's/ranger's cabin bigger cousin. Can be civilian or military and go anywhere in size from a single structure for a few people to a complex of several fortified barracks, warehouses and towers with a wall.