1939 1940 1941 1942 1943 1944 1945 Convoy HX 231 was the 231st of the numbered series of Second World War HX convoys of merchant ships from HalifaX to Liverpool.

The ships departed New York City on 25 March 1943 and were met on 31 March by Mid-Ocean Escort Force Group B-7.

The convoy was found on 4 April and attacked by eleven U-boats of the 1st, 3rd, 6th and 10th U-boat flotillas, from Brest, La Rochelle, St Nazaire and Lorient, respectively.

These U-boats formed wolfpack Löwenherz' (Lionheart).

The U-boats sank six ships before losing contact on 7 April.