Convoy JW 51B came under attack by German surface units, engaged in Operation Regenbogen, on 31 December. In the engagement, a British minesweeper and a British destroyer were sunk and a German destroyer were sunk; no ships were lost from the convoy in what became known as the Battle of the Barents Sea.
Convoy JW 51A consisted of 15 merchant ships which departed from Loch Ewe on 22 December 1942. Close escort was provided by the minesweeper HMS Bramble, two corvettes and two armed trawlers. The close escort was supported by six Home Fleet destroyers led by HMS Onslow (Captain Robert Sherbrooke). The convoy sailed with a local escort group from Britain and was joined later by a local escort group from Murmansk. A cruiser cover force comprising HMS Jamaica, HMS Sheffield and two destroyers, was also at sea, from Kola Inlet, to guard against attack by surface units. Distant cover was provided by a Heavy Cover Force from Iceland comprising the battleship HMS Anson, the cruiser Cumberland and five destroyers.
Convoy JW 51B departed Loch Ewe on 22 December 1942, accompanied by its local escort, of four destroyers, and its close escort.
Three days later, on 25 December, it was joined by the ocean escort, while the local escort departed. On 27 December the convoy ran into a gale, which scattered the convoy over the next two days into several groups across a wide area. Dover Hill was forced to return with weather damage and five ships and two escorts had become separated. Three of the ships rejoined on 30 December, but Chester Valley, in company with the armed trawler Vizalma, and another, with the destroyer Oribi, remained separated. During 30 December, Bramble detached from the main body of the convoy to search for the stragglers.
On 24 December the convoy had been sighted by a patrolling aircraft, but was lost later during the storm. On 30 December it was found again by U-354, and Operation Regenbogen began. On 31 December the German ships, in two sections, met the ocean escort of Convoy JW 51B, and after a sharp engagement, which left the minesweeper Bramble and the destroyer Achates sinking and Onslow, damaged; the attacking force was driven off. The destroyer, Eckoldt was sunk and the cruiser Hipper was damaged. No further attacks developed, and on 1 January 1943 Vizalma and her charge rejoined the convoy. On 2 January Convoy JW 51B was met by its eastern local escort, two minesweepers from Murmansk. On 3 January the main body arrived in Kola Inlet, joined the following day by Oribi and her charge.
The 15 ships of Convoy JW 51B arrived at Murmansk without loss, though one had been damaged. Despite the loss of two warships, the convoy was a success and the failure of the German surface force against the convoy caused a loss of confidence by Hitler in the Kriegsmarine and its commander, Admiral Erich Raeder, which led to him resigning.[1] Thereafter, the main threat to the Allied convoy system was from U-boats.
Churchill, Winston S. (1950). The Hinge of Fate. The Second World War. Vol. IV. Boston: Houghton Mifflin. OCLC1035611815.
Pearson, Michael (2007) [2002]. Red Sky in the Morning: The Battle of the Barents Sea 1942 (repr. ed.). Barnsley: Pen & Sword Maritime. ISBN978-1-84415-452-4.
Rohwer, Jürgen; Hümmelchen, Gerhard (2005) [1972]. Chronology of the War at Sea, 1939–1945: The Naval History of World War Two (3rd rev. ed.). London: Chatham. ISBN978-1-86176-257-3.
Ruegg, R.; Hague, A. (1993) [1992]. Convoys to Russia: Allied Convoys and Naval Surface Operations in Arctic Waters 1941–1945 (2nd rev. enl. ed.). Kendal: World Ship Society. ISBN0-905617-66-5.
Woodman, Richard (2004) [1994]. Arctic Convoys 1941–1945. London: John Murray. ISBN978-0-7195-5752-1.
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