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Knockalla Fort (Elevation 28 metres 92 feet) was built in 1810 by the British as a defence against possible French invasion of Ireland. The fort was one of six built on Lough Swilly and acted as the main headquarters. It consists of a Martello tower with walls 11 foot thick and faced with sandstone to minimise the effects of shrapnel on the men below during attack. Inside the fort there are two wells; one is located at the foot of the tower and the second, if the siege took a turn for the worst, inside the tower itself. The fort and surrounding grounds were sold in the 2000’s for 740,000 euro.
In the background is Fort Dunree, Urrishills and in the distance Dunaff Head. Discovery Map Series 2: Map Ref. C27128 37038