Nummer: 05203
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 10.05.1941 |
| Time of attack : | 07:52 |
| Nationality of U-boat : | German |
| U-boat : | U 556 |
| Commander : | Wohlfarth |
| Grid : | AK 1390 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 7000 BRT |
| presumed result : | sunk |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | OB.318 d |
| Date of observation : | 10.05.1941 |
| Time of observation : | 04:45 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Empire Caribou |
| Year of launch : | 1919 |
| Actual tonnage : | 4861 BRT |
| Actual result : | sunk |
| Position of target : | 59.28n 35.44w |
Steam Freighter Empire Caribou ex American Defacto (bis 1940)
| Convoy : | OB.318 d |
| Route of convoy : | Liverpool - North America (out) |
| Remark to convoy : | Sep 1939 to Jul 1940 via South Ireland, Jul to Okt 1940 via North Cannel, then ON. |