Nummer: 18703c
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 20.12.1944 |
| Nationality of U-boat : | German |
| U-boat : | U 870 |
| Commander : | Hechler |
| Grid : | CF 2636 |
| presumed target type : | Corvette |
| presumed result : | sunk |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Convoy : | unknown |
| Date of observation : | 20.12.1944 |
| Nationality of target : | American |
| Actual type of target : | Destroyer Escort |
| Name of target : | Fogg (DE.57) |
| Year of launch : | 1943 |
| Actual tonnage : | 1400 ts |
| Actual result : | damaged |
| Position of target : | 43.02n 19.19w |
| Footnote : | U-870 fired a spread and reported LST-350 and LST-369 sunk, but indeed LST-359 was sunk. - DE "Fogg" was damaged by a gnat in the stern but towed to port. |
| related attacks : | Angriff 1 Angriff 2 |
| Convoy : | unknown |