Towards the latter end of the wars of 1641, Ballymore was home to a strong garrison of the English forces. Their garrison was located beside Lough Seudy, and divided from the mainland by "a deep and large graff, with ramparts of earth and bulwarks: the ditch was carried so low as to receive three or four feet of the stagnant water of the lake, over which was by a draw-bridge the entry into the fort; this was the chief fortress of this county".