Nummer: 15811a
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 17.03.1943 |
| Time of attack : | 08:39 |
| Nationality of U-boat : | German |
| U-boat : | U 91 |
| Commander : | Walkerling |
| Grid : | BD 1334 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 5000 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo coup de grâce |
| Convoy : | HX.229 |
| Date of observation : | 17.03.1943 |
| Time of observation : | 15:00 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Nariva |
| Year of launch : | 1941 |
| Actual tonnage : | 8714 BRT |
| Actual result : | sunk |
| Position of target : | 50.34n 35.02w |
| Footnote : | U-435 fired a 2-torpedo FAT spread, and heard two detonations after 13:46 min. - "William Eustis" was damaged, but at 11:53h possibly observed by U-91 to be in a sinking condition or being self-sinking. |
| 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. |
| updated on: | 00.00.0000 |
| Remark: | br |
| Changes: | 1) Middlebrook: FT 0905/17/835 + Schußmeldung |