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Harwich Redoubt Fort

An extremely impressive 180ft 60m diameter circular fort built in 1808 to defend the port of Harwich against a Napoleonic invasion. It is the only such example open to the public. Eleven guns sit on the battlements. Eighteen casements below would house 300 troops in siege conditions. Part…
Distance: 13.3 miles away

Harwich
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Slightly further afield