The Canadian destroyer Iroquois and the British destroyer Ursa along with the British cruiser Mauritius, took part in the action. Two foe minesweepers, three supply ships, and three escort vessels including two heavily-armed escorts were knocked out of action. The British-Canadian force came through without casualty or damage despite the fact German shore batteries also opened up. The Iroquois was under command of  Com. J.C. Hibbard who won the D.S.C aboard H.M.C.S. Skeena earlier in the war.

First contact with the enemy was made shortly after midnight when a minesweeper, an escort vessel and a small supply ship were encountered. The last-named was sunk and the others were set afire and driven ashore. Later, a small convoy consisting of a medium-sized supply ship was encountered, accompanied by a minesweeper and two heavily-armed escort vessels. All were destroyed, the admiralty said.

This action came less than a week after the Iroquois, a veteran of the Murmansk convoy run, the Ursa and the Mauritius sank or damaged eight enemy ships off St. Nazaire.