Date of Action: 22 February 1943?
USCG Units Involved: USCGC Spencer
Location: North Atlantic
Credit by U.S. Navy? No
Enemy Warship's Commanding Officer: Kapitšnleutnant Georg-Werner Fraatz
Enemy Casualties: 40 killed in action; all hands lost
USCG Casualties: None
The loss of U-529 had originally been attributed to an attack by an RAF aircraft on 15 February 1943. That attack, according to Royal Navy sources, actually ended in the destruction of the U-225, which had been originally credited to USCGC Spencer.
Spencer received credit after the war from the US Navy for attacking and sinking the U-225 in the North Atlantic on 21 February 1943. The British have since recorded that the U-225 was actually destroyed by the Liberator "S" of RAF No. 120 Squadron on 15 February and they have changed the official British records to reflect this correction. The renowned German historian, Professor/Dr. Jurgen Rohwer states that the Spencer "probably" attacked and sank the U-529 on this date, although the Spencer has not received official credit from the Navy for this sinking.
For further information, see:
J. Rohwer and G. Hummelchen. Chronology of the War At Sea: 1939-1945: The Naval History of World War Two. Annapolis, Maryland: Naval Institute Press, 1992, p. 194.