Nummer: 15613a
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 13.03.1943 |
| Time of attack : | 05:30 |
| Nationality of U-boat : | German |
| U-boat : | U 107 |
| Commander : | Gelhaus |
| Grid : | CG 1218 |
| presumed target type : | Steam Freighter |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | OS.44 |
| Date of observation : | 13.03.1943 |
| Time of observation : | 04:39 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Clan Alpine |
| Year of launch : | 1918 |
| Actual tonnage : | 5442 BRT |
| Actual result : | sunk |
| Position of target : | 42.45n 13.31w |
| related attacks : | Angriff 1 Angriff 2 Angriff 3 |
| Convoy : | OS.44 |
| Route of convoy : | London / Liverpool - Freetown (Sierra Leone) |
| Remark to convoy : | Since Jul 1941, from Apr 1943 combined with KMS in Atlantic (counter traffic = SL) |