 The O'Driscolls were constantly under pressure from encroachments by Anglo-Norman settlers and rival Gaelic clans on their territory and trade interests, which resulted in the castle being attacked and destroyed numerous times in the following centuries.One especially long-running feud erupted between the O'Driscolls and the merchants of Waterford City in 1368, following an attack on the Waterford fleet by the O'Driscolls.This feud continued on and off for almost two centuries, ending in the sacking of Dunasead, Baltimore and other O'Driscoll castles by another Waterford fleet in 1537.