The convoy consisted of 47 merchant ships which departed from
Loch Ewe on 27 March 1944. It also included the US cruiser , which was being transferred to the Soviet navy as part of an agreement over the disposal of the surrendered Italian fleet. The convoy was joined from Iceland by three more ships en route from North America. Close escort was provided by a force led by Lt.Cdr Lambton in the destroyer . The force comprised two other destroyers and three corvettes. The force was supported by two escort carriers, and , which travelled with the convoy, and an "Ocean escort" of 17 fleet destroyers led by R.Adm.
Frederick Dalrymple-Hamilton in the cruiser . JW 58 was joined by the
2nd Support Group (2 SG) the navy's most successful anti-submarine warfare group, consisting of five sloops led by Capt.
Frederick Walker, in . The convoy was accompanied initially by local escort groups from Britain and Iceland, joined later by a local escort group from Murmansk. Distant cover was provide by ships of the Home Fleet which were engaged in
Operation Tungsten, an air strike against the German battleship
Tirpitz anchored in Alta fjord. These were the battleships and , the carrier , cruiser and six destroyers under the command of Vice-Admiral
Bruce Fraser. Ranged against this force were the U-boats of the German arctic flotilla, 16 boats forming the patrol lines
Blitz,
Hammer and
Thor. German surface forces and air forces were much diminished at this stage of the conflict;
Tirpitz was still not operational after
Operation Source when British X-Craft damaged the ship and the
Luftwaffe was reduced to scouting and shadowing operations. ==Action==