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Martello towers are small defensive forts built by the British Empire at the time of the Napoleonic Wars. They stand about 40 feet (12m) high (with two floors) and had a garrison of one officer and 25 men. Their round structure and thick walls of solid masonry made them immensely resistant to cannon fire, while their height made them an ideal platform for a single heavy artillery piece, mounted on the flat roof and able to traverse a 360° arc. A few were surrounded by a moat for extra defence.

Martello towers abroad

Martello towers were exported to many colonies of the British Empire, including South Africa (at Simon's Town Naval base near Cape Town), America, Canada, Minorca, the Channel Islands and Ireland. The construction of Martello towers abroad continued until as late as the 1860s, but was discontinued after it became clear that they could not withstand rifled artillery weapons.

One Martello tower, in Mauritius, nearby the La Preneuse public beach in Tamarin, has been restored by the Friends of the Environment and operates as a museum open for visitors. The original entrance to the tower is raised above ground, and a new entrance has been constructed at ground level.

Martello towers dot the Irish coast around Dublin Bay, possibly the most famous of which is the Martello tower in Sandycove, Dun Laoghaire, in which James Joyce lived. Martello towers feature in many literary works based in the city.

A number of Martello towers were built in Canada. One stands on the Plains of Abraham above Quebec City in Canada, overlooking the St Lawrence River. It has been restored as a museum and can be visited. No less than six were built at Kingston, Ontario, as part of the fortifications at Fort Henry, one of which, Murney Tower is now a museum. Carleton Martello Tower, overlooking the harbour of Saint John, New Brunswick, is now a museum and National Historic Site.

The last Martello tower built in the British Empire is said to be that at Fort Denison, a small island in Sydney Harbour, New South Wales, for the protection of Sydney against possible attack by the Russians during the Crimean War of the 1850s. It is well preserved and a popular tourist attraction.

"One man's obsession with Martello Towers has resulted in this detailed website"
- Anglia TV's Time Trail Factsheet No.2

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