Nummer: 16517
| Area : | Western Area |
| Sea area : | West African Coast |
| Date of attack : | 05.05.1943 |
| Time of attack : | 11:20 |
| Nationality of U-boat : | German |
| U-boat : | U 123 |
| Commander : | Schroeter |
| Grid : | EU 7251 |
| presumed target type : | Steam Freighter id |
| presumed tonnage : | 4566 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) + Gunfire |
| Date of observation : | 05.05.1943 |
| Time of observation : | 09:40 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Holmbury |
| Year of launch : | 1925 |
| Actual tonnage : | 4566 BRT |
| Actual result : | sunk |
| Position of target : | 04.30n 10.20w |