Nummer: 03418
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 20.10.1940 |
| Time of attack : | 02:04 |
| Nationality of U-boat : | German |
| U-boat : | U 47 |
| Commander : | Prien |
| Grid : | AL 0365 |
| presumed target type : | Tanker |
| presumed tonnage : | 9000 BRT |
| presumed result : | damaged |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | HX.79 |
| Date of observation : | 20.10.1940 |
| Time of observation : | 01:24 |
| Nationality of target : | British |
| Actual type of target : | Motor Tanker |
| Name of target : | Athelmonarch |
| Year of launch : | 1928 |
| Actual tonnage : | 8995 BRT |
| Actual result : | damaged |
| Position of target : | 56.45n 15.58w |
| Convoy : | HX.79 |
| 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. |