A military camp or bivouac is a semi-permanent facility for the lodging of an army. Camps are erected when a military force travels away from a major installation or fort during training or operations, and often have the form of large campsites. In the Roman era the military camp had highly stylized parameters and served an entire legion. Archaeological investigations have revealed many details of these Roman camps at sites such as Vindolanda (England) and Raedykes (Scotland).