York Redoubt
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York Redoubt is a National Historic Site on a bluff overlooking the entrance to Halifax Harbour at Ferguson's Cove, Nova Scotia, built in 1793. It was a key element in the defence of Halifax Harbour in the 19th and 20th centuries. It was a nerve centre for harbour defences, including 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, and was used in World War II as a command centre. The fort is considered to have the first radar station constructed in the world.