'Blarneystone' (i) was a British special forces raid on the Iles St Marcouf off the Normandy coast of German-occupied France (August 1942).

The islands became the first French territory to be liberated at the start of 'Overlord' by Allied seaborne forces: at 04.30 on 6 June 1944 four men landed from two canoes to establishment that the islands were not held by the Germans, and then 132 men of the 4^th and 24^th Squadrons of Colonel Joseph M. Tully’s US 4^th Cavalry Group landed on the unoccupied Ile du Large and Ile de Terre to secure the northern-western approaches to 'Utah' Beach, in the process suffering 19 men killed or wounded from the detonation of mines which the Germans had laid.