Nummer: 00421
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 17.10.1939 |
| Time of attack : | 16:31 |
| Nationality of U-boat : | German |
| U-boat : | U 37 |
| Commander : | Hartmann |
| Grid : | BE 9272 |
| presumed target type : | Steam Freighter id |
| presumed tonnage : | 10183 BRT |
| presumed result : | sunk |
| Number of torpedoes/mines : | 2 |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | HG.3 |
| Date of observation : | 17.10.1939 |
| Time of observation : | 16:40 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Yorkshire |
| Year of launch : | 1920 |
| Actual tonnage : | 10184 BRT |
| Actual result : | sunk |
| Position of target : | 44.52n 14.31w |
| Convoy : | HG.3 |
| Route of convoy : | Gibraltar - United Kingdom (home) |
| Remark to convoy : | Sep 1939 to Sep 1942, then MKF und MKS |