Three Allied warships, which had already established control off the coast of Brittany and were lurking off Audierne south of the invested fortress of Brest, intercepted and sank eight German vessels of an armed convoy.[5] Davis ordered Iroquois; the ship closest to the contact, commanded by James Calcutt Hibbard to use the Type 293 radar and relay the information to the rest of the force.[2] Hibbard placed so much confidence in the radar that he decided to direct the opening moves from the Action Information Centre rather than the bridge, and then gave the order to illuminate with star shell.Upon opening fire, the British and Canadians quickly overwhelmed the convoy sinking two vessels and causing two others to collide in the confusion and burst into flames as they raced for shore, with surviving crew members jumping over the side as they went.They sent landing parties ashore on the French mainland and outlying islands to secure them and ensured they were eliminated as potential bases of logistical supply to the Germans.
Radar plotters Able Seamen William Ewasiuk and Harry Henderson of HMCS
Iroquois
, 21 August 1944