In 1789, Colonel Charles Vallancey of the Corps of Irish Engineers, who had been made responsible for the fortification of the harbour during the American war, persuaded the then Lord Lieutenant John Fane, 10th Earl of Westmorland to allow the construction of a permanent fortification on Spike Island. This work was undertaken by the Irish Board of Ordnance. In October 1790, the Earl visited the island and named the incomplete structure Fort Westmorland. In 1793, France declared war on Britain and a conflict began which, with one interlude, would occupy the next two decades.
