Operation J V was a British Commando raid over the night of 11/12 April 1942, during the Second World War. It was carried out by two men Captain Gerald Montanaro, accompanied by Trooper Preece of 101 (Folbot) Troop, No. 6 Commando. The two men paddled a two man canoe into Boulogne harbour, planted a limpet mine on a German tanker and withdrew unseen.