Operation Juno was a German sortie to the North Sea during the Norwegian Campaign. The most notable engagement of the operation was German battleships and sinking the British aircraft carrier and its two escorting destroyers. Several Allied vessels were sunk in other engagements. Operation The German ships involved were the battleships and , the heavy cruiser and the destroyers , , and . The operation began on 8 June 1940, as an attack on Harstad to relieve pressure on the German garrison at Narvik. After refuelling at Jan Mayen Island the operation became redundant as the Allies were evacuating from Norway. The German commander, Admiral Wilhelm Marschall, took the initiative to seek and destroy the Allied transports. The troop transport Orama, the tanker Oil Pioneer and the mine-sweepeing trawler were sunk. Marschall ordered the Admiral Hipper and the destroyers to Trondheim, where they arrived in the morning of 9 June. The next day, Admiral Hipper attempted to leave Trondheim but was prevented by the sighting of a British submarine. Sinking of HMS Glorious As the most notable engagement of Operation Juno, Scharnhorst and Gneisenau sank the British aircraft carrier (Captain Guy D'Oyly-Hughes, a submarine specialist with only ten months' experience of aircraft carrier operations) and her escorting destroyers and on 8 June at around 69° N off Norway. On the night of 7/8 June, Glorious, took on board ten 263 Squadron Gloster Gladiators and eight Hawker Hurricanes of 46 Squadron Royal Air Force, the first landing of modern aircraft without arrestor hooks on a carrier. These had flown from land bases to keep them from being destroyed in the evacuation. Glorious was part of a troop convoy headed for Scapa Flow, also including the carrier . In the early hours of 8 June, Glorious requested permission to proceed independently at a faster speed. According to Alan Beith, this was because D'Oyly-Hughes was impatient to hold a court-martial of his Commander, Flying, J. B. Heath and Lieutenant Commander Evelyn Slessor. Heath had refused an order to attack certain shore targets on the grounds that his aircraft were unsuited to the task and had been left behind in Scapa to await trial. It has been noted by Beith that Glorious was in a low state of readiness. The high crow's nest look-out position was not manned, leaving the observation task to the destroyers with much lower observation angles. Only 12 out of