Nummer: 15519a
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 11.03.1943 |
| Time of attack : | 02:42 |
| Nationality of U-boat : | German |
| U-boat : | U 757 |
| Commander : | Deetz |
| Grid : | AK 9872 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 7600 BRT |
| presumed result : | damaged |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | HX.228 |
| Date of observation : | 11.03.1943 |
| Time of observation : | 02:40 |
| Nationality of target : | American |
| Actual type of target : | Steam Freighter |
| Name of target : | William C. Gorgas |
| Year of launch : | 1943 |
| Actual tonnage : | 7197 BRT |
| Actual result : | damaged |
| Position of target : | 51.35n 28.30w |
| Footnote : | U-757 sank "William C. Gorgas" in two attacks. After the coup de grâce the ammunition freighter exploded and heavily damaged U-757. It was probably this detonation which gave "Henry Wynkoop" a violent shock at about 3:50 GMT. |
| related attacks : | Angriff 1 Angriff 2 |
| Convoy : | HX.228 |
| 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. |