Nummer: 15909a
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 18.03.1943 |
| Time of attack : | 16:43 |
| Nationality of U-boat : | German |
| U-boat : | U 221 |
| Commander : | Trojer |
| Grid : | AK 6897 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 5495 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | HX.229 |
| Date of observation : | 18.03.1943 |
| Time of observation : | 15:52 |
| Nationality of target : | American |
| Actual type of target : | Steam Freighter |
| Name of target : | Walter Q. Gresham |
| Year of launch : | 1943 |
| Actual tonnage : | 7191 BRT |
| Actual result : | sunk |
| Position of target : | 53.35n 28.05w |
| Footnote : | U-221 hit "Walter Q. Gresham" with a stern shot, and the ship sank in one hour. Two torpedoes hit "Canadian Star" which sank in 15 min. The FAT-torpedo was an end-of-run detonator. |
| related attacks : | Angriff 1 |
| Convoy : | HX.229 |
| Route of convoy : | (New York) - Halifax - United Kingdom |
| Remark to convoy : | Sep 1939 to Sep 1942 ab Halifax, then from New York (counter traffic = ON), vgl. HXF und SC. |