Martellos are small defensive forts built in several countries of the British Empire during the 19th century, from the time of the Napoleonic Wars onward.

These forts stand up to 40 feet high (with two floors) and typically had a garrison of one officer and 15–25 men. Their round structure and thick walls of solid masonry made them 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 towers had moats for extra defence. The Martello towers were used during the first half of the 19th century, but became obsolete with the introduction of powerful rifled artillery. Many have survived to the present day, often preserved as historic monuments.

The interior of a classic British Martello tower consisted of three stories (sometimes with an additional basement). The ground floor served as the magazine and storerooms, where ammunition, stores and provisions were kept. The garrison of 24 men and one officer lived in a casemate on the first floor, which was divided into several rooms and had fireplaces built into the walls for cooking and heating. The officer and men lived in separate rooms of almost equal size. The roof or terreplein was surmounted with one or two cannons on a central pivot that enabled the guns to rotate up to 360 degrees. A well or cistern within the fort supplied the garrison with water. An internal drainage system linked to the roof enabled rainwater to refill the cistern.


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