Macamish Fort is one of several Napoleonic batteries built along the shores of Lough Swilly in county Donegal, to defend the north west of Ireland. It was part of a scheme to fortify Lough Swilly and Lough Foyle against French Invasion during the Revolutionary and Napoleonic Wars and was completed between 1812 and 1813. It was built on a rock outcrop overlooking the lough. It comprises a Martello Tower mounting a single gun and battery mounting three guns. The fort was originally entered by a drawbridge.