The site of a post-medieval coastal fort. Two coastal gun batteries were in operation around Ramsey harbour mouth during the French Revolutionary Wars (1792-1802) and the Napoleonic Wars (1803-1816). To the south of the river mouth, a gun battery was constructed in 1793 and was later replaced in 1816 by a two-gun barbette, described as just to the north of the Harbour Office.  A second battery of two guns was established to the north of the rivermouth in 1797 on the Mooragh. Recommendations to move the 1793 and 1797 batteries to more strategic positions were made in 1799, but unless represented by the later construction of the barbette in 1816, no direct action appears to have been taken to meet this requirement.