There are also several of the Martello towers of the Napoleonic era.
MARTELLO TOWER, a kind of tower formerly used in English coast defence.
The Martello tower was introduced in consequence of an incident of the French revolutionary wars.
The strong resistance offered by these three guns seems to have led to the conclusion that towers of this description were specially formidable, and Martello towers were built in large numbers, and at heavy expense, along the shores of England, especially on the southern and eastern coasts, which in certain parts are lined with these towers at short intervals.
The French tours modeles were somewhat similar to the Martello towers; their chief use was to serve as keeps to unrevetted works.