Nummer: 01504a
| Area : | Western Area |
| Sea area : | North Sea |
| Date of attack : | 21.02.1940 |
| Time of attack : | 18:09 |
| Nationality of U-boat : | German |
| U-boat : | U 57 |
| Commander : | Korth |
| Grid : | AN 1654 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 7000 BRT |
| presumed result : | damaged |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | HX.19 s |
| Date of observation : | 21.02.1940 |
| Time of observation : | 16:15 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Loch Maddy |
| Year of launch : | 1934 |
| Actual tonnage : | 4996 BRT |
| Actual result : | damaged |
| Position of target : | 20sm 70° Copinsay (Orkney |
| Footnote : | "Loch Maddy" was hit amidships by one torpedo from U-57/Korth and abandoned. After the final hit by U-23/Kretschmer the wreck broke in two parts and sank. |
| related attacks : |
| Convoy : | HX.19 s |
| 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. |