Nummer: 01713
| Area : | Western Area |
| Sea area : | Norway West Coast |
| Date of attack : | 20.04.1940 |
| Time of attack : | 12:48 |
| Nationality of U-boat : | German |
| U-boat : | U 9 |
| Commander : | Lüth |
| Grid : | AF 7945 |
| presumed target type : | Destroyer |
| presumed tonnage : | 1975 ts |
| presumed result : | damaged |
| Number of torpedoes/mines : | 2- |
| Used weapon(s) : | Torpedo(es) |
| Nationality of target : | Polish |
| Actual type of target : | Destroyer |
| Name of target : | Blyskawica (H 34) |
| Year of launch : | 1936 |
| Actual tonnage : | 2010 ts |
| Actual result : | hit not ascertained |
| updated on: | 10.01.2006 |
| Remark: | Blyskawica |