Nummer: 18320
| Area : | Western Area |
| Sea area : | English Channel |
| Date of attack : | 30.07.1944 |
| Nationality of U-boat : | German |
| U-boat : | U 621 |
| Commander : | Stuckmann |
| Grid : | BF 3274 |
| presumed target type : | Passenger Liner |
| presumed tonnage : | 9000 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo with gyro-angle and zig-zaggig course |
| Convoy : | ETM.49 |
| Date of observation : | 30.07.1944 |
| Nationality of target : | British |
| Actual type of target : | Troop Transport |
| Name of target : | Ascanius |
| Year of launch : | 1910 |
| Actual tonnage : | 10048 BRT |
| Actual result : | damaged |
| Position of target : | 50.15n 00.48w |
| Convoy : | ETM.49 |
| updated on: | 05.09.2013 |
| Remark: | ETM.49 |
| Changes: | 1) Kolbicz 2002 (Liste E183): AP ex -DP 2) Hague, 5.9.2013: Convoy ETM.49 |