York Redoubt is a National Historic Site situated on a bluff overlooking the entrance to Halifax Harbour at Ferguson\'s Cove, Nova Scotia, originally constructed in 1793. It was a key element in the defence of Halifax Harbour in the 19th and 20th centuries. It was a command centre for harbour defences in WWII, which included observation posts, gun placements and an anti-submarine net which stretched across the harbour\'s entrance from Fort McNab on McNabs Island.York Redoubt remained in military use until 1956. A1, Canon, Halifax, Nova, Redoubt, Scotia, XH, York