The camp was enclosed by 2.5 m (8 ft 2 in) double barbed-wire fence, with rolls of barbed-wire in between. About 4 m (13 ft) inside the fence, a strand of electrified wire delimited "no man's land" which it was strictly forbidden to enter. Armed guards manned watchtowers at each corner, and at the centre of each side, of the camp.[1]