Nummer: 06906
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 17.10.1941 |
| Time of attack : | 00:07 |
| Nationality of U-boat : | German |
| U-boat : | U 553 |
| Commander : | Thurmann |
| Grid : | AL 1922 |
| presumed target type : | Tanker |
| presumed tonnage : | 6000 BRT |
| presumed result : | sunk |
| Number of torpedoes/mines : | 4 |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | SC.48 |
| Nationality of target : | British |
| Actual type of target : | Corvette |
| Name of target : | Gladiolus |
| Year of launch : | 1940 |
| Actual tonnage : | 925 ts |
| Actual result : | sunk |
| Footnote : | At 2200 GMT, HMCS "Wetaskiwin" received a signal from HMS "Gladiolus" requesting a signal for radar purposes on 325 k/cs. They doubted the authenticity of the signal, asked for identification, but received no reply. "Gladiolus" was claimed missing since 17/0100 by SOE. - U-553 was slightly damaged by depth charges from USS "Livermore" immediately after her attack. |
| Convoy : | SC.48 |
| 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: | U432 Bold Venture |