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Fort Dunree is a Napoleonic age fortification on the west coast of the Inishowen peninsula in Donegal.
The fort is located on a rocky promontory accessed over a natural fissure. Originally built as part of a series of fortifications defending Lough Swilly during the Napoleonic Wars, located opposite Knockalla Fort on the other side of the lough.
The fort was neglected after the peace of 1815.
It was remodelled in 1895 to have 2 x 4.7 inch (120 mm) QF guns below, and later 12 pounder (5 kg) QF and 2 x 6 inch (152 mm) guns in an upper land battery. The top of a hill overlooking the site was walled in to form a redoubt. Both 6-inch guns were operational during the First World War.

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