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.

USS Margaret (ID-2510) – shortly thereafter known as USS Chatham (ID-2510) -- was a cargo ship acquired by the U.S. Navy during World War I. She was used to carry cargo to Allied troops in Europe until the war's end when she was returned to the U.S. Shipping Board for disposition.