Martello towers were small forts built across the British Empire during the 19th century. Their round structure and thick masonry made them resistant to cannon fire, while their height made them an ideal platform for artillery. The Carleton Martello Tower in Saint John, New Brunswick, is one of nine surviving Martello Towers in Canada. Construction of the tower began in 1813, during the War of 1812, to guard the land approaches to the city against an American overland invasion.
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