Richard Cannon, Historical Record of the Eighteenth…
“ The ROYAL IRISH regiment formed part of the force employed in the siege of the important fortress of Lisle, the capital of French Flanders, and the regiment had numerous opportunities of distinguishing itself during the long and determined defence made by a numerous garrison under Marshal Boufflers. The citadel did not surrender until the 9th of December. The EIGHTEENTH had two captains and three subalterns killed, the major and several other officers wounded, and two hundred non-commissioned officers and soldiers killed and wounded. ”
