The two highest land elevations surveyed for Devils Battery observation posts were Flandrum Hill, Cow Bay and Caldwell Road between "A-23" barracks and "Radio 16" aircraft direction radar (Scott Drive). Each elevated point had a four-storey reinforced concrete Victoria Fortress Observation Post, with plotting rooms and telephones connected to the Halifax fire command post. Two other three-storey observation posts were erected, one at the new radar installation at Osborne Head, and the other above the hill behind the three turrets. Each look-out was staffed by a crew of two on the top storey using a Depression position finder looking out towards the harbour for any suspicious targets.
