PQ 17 was the code name for an Allied World War II convoy in the Arctic Ocean. In July 1942, the Arctic convoys suffered a significant defeat when Convoy PQ 17 lost 24 of its 35 merchant ships during a series of heavy enemy daylight attacks which lasted a week. On 27 June, the ships sailed eastbound from Hvalfjord, Iceland for the port of Arkhangelsk, Russia. The convoy was located by German forces on 1 July, after which it was shadowed continuously and attacked. The convoy's progress was being observed by the British Admiralty. First Sea Lord Admiral Dudley Pound, acting on information that German surface units, including the German battleship Tirpitz, were moving to intercept, ordered the covering force away from the convoy and told the convoy to scatter. However, due to vacillation by the German high command, the Tirpitz raid never materialized. The convoy was the first joint Anglo-American naval operation under British command in the war.