The purpose of this report is first, to describe and assess the impact the series of developments in armament during the latter half of the 19th century had generally on the defences of Halifax and second, to trace the history of the Citadel's ordnance in two markedly different eras, smooth bore (1825-60s) and rifled (1860s-1900). This approach has been adopted so that this aspect of the Citadel's history will not be seen in isolation but set in the wider context of British imperial policy for all of Halifax.