one of several Martello towers on the east coast of England. They were constructed to defend the country against invasion by Napoleon Bonaparte and his armies. In total, 103 Martello towers were built between 1804 and 1812, 74 were built between 1804 and 1808 along the Kent and Sussex coast from Folkestone to Seaford, and 29 along the east coast between Point Clear near St Osyth and Aldeburgh from 1809 to 1812. The south coast towers were numbered 1 – 74 and the east coast towers were lettered A – Z. Three other east coast towers are known as AA, BB and CC. (Wikipedia).
This is Tower D – source: https://historicengland.org.uk/listing/the-list/list-entry/1016553 (I’m citing the source because the information is currently wrong on Wikipedia)
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