Hudson reconnaissance aircraft of 220 Squadron RAF spotted a part of German Marine Gruppe 1 and reported the presence of 1 cruiser and 6 destroyers at 1325 hours, sailing in a northward direction; 12 Blenheim and 24 Wellington bombers were dispatched to attack this group but the attack was not successful. The British Admiralty, receiving reports of major German naval movements, incorrectly assumed the Germans were launching a major attack into the Atlantic Ocean. The Home Fleet departed from Scapa Flow at 2115 hours, while the 1st Cruiser Squadron disembarked the troops already on board in order to prepare for a battle on the open seas. Nevertheless, British submarines continued to patrol the European coast for German activity rather than going out to the open seas; HMS Shark and HMS Seawolf departed Harwich naval base to patrol off Dutch coast, while HMS Clyde and HMS Thistle departed Scapa Flow to patrol the coast of Norway.
