German submarine U-571 was a Type VIIC U-boat built for the Kriegsmarine of Nazi Germany for service during World War II. U-571 conducted eleven war patrols, sinking five ships totalling 33,511 gross register tons (GRT), and damaging one other for 11,394 GRT. On 28 January 1944 she was attacked by an Australian-crewed Sunderland aircraft from No. 461 Squadron RAAF west of Ireland and was destroyed by depth charges. All hands were lost.

No. 461 Squadron was a Royal Australian Air Force maritime patrol squadron during World War II which operated under Royal Air Force control flying in Europe and over the Atlantic. The squadron was formed in 1942 and was disbanded in mid-1945, just after the end of the war in Europe. Personnel were drawn from many countries of the British Empire, although the majority were Australians. Throughout the war, the squadron was credited with destroying a total of six German U-boats, and operated mainly in the Bay of Biscay and Atlantic.