Nummer: 15504b
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 09.03.1943 |
| Time of attack : | 22:41 |
| Nationality of U-boat : | German |
| U-boat : | U 409 |
| Commander : | Maßmann |
| Grid : | AL 1690 |
| Convoy : | SC.121 |
| Footnote : | U-409 torpedoed No.75 "Rosewood" which broke in two and was sunk by USCGC "Bibb" thereafter. U-409 heard one more detonation. This may have been the target of U-405 fired at 22:35 MET. |
| related attacks : | Angriff 1 |
| Convoy : | SC.121 |
| Route of convoy : | Sydney (Nova Scotia) - United Kingdom |
| Remark to convoy : | Slow (Atlantic) Convoys since Aug 1940, fast ones = HX, counter traffic = ON. |
| updated on: | 00.00.0000 |
| Remark: | Detonation |
| Changes: | 1) Weis, 02.04.06: kein T-Schuss, nur eine weitere Detonation, daher ist das T auf alle Fälle, aber auch = gestrichen |