Nummer: 18613
| Area : | Western Area |
| Sea area : | US East Coast |
| Date of attack : | 30.11.1944 |
| Time of attack : | 00:57 |
| Nationality of U-boat : | German |
| U-boat : | U 1231 |
| Commander : | Lessing |
| Grid : | BB 1486 |
| presumed target type : | Destroyer |
| presumed result : | sunk |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Actual tonnage : | ---- -- |
| Actual result : | hit not ascertained |
| Footnote : | U-1231 heard a gnat end-of-run detonation after 10 min. |