Nummer: 05201a
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 10.05.1941 |
| Time of attack : | 04:42 |
| Nationality of U-boat : | German |
| U-boat : | U 556 |
| Commander : | Wohlfarth |
| Grid : | AK 1470 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 8000 BRT |
| presumed result : | sunk |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | OB.318 |
| Date of observation : | 10.05.1941 |
| Time of observation : | 02:48 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Aelybryn |
| Year of launch : | 1938 |
| Actual tonnage : | 4986 BRT |
| Actual result : | damaged |
| Position of target : | 59.23n 35.25w |
| Footnote : | "Aelybryn" reached Reykjavik in damaged condition on May 17th. The second ship was not the Dutch steamer "Hercules" (2095 grt), as assumed by the B-Dienst from a SSS-signal. In reality the torpedo missed the British steamer "Chaucer" (5792 grt). |
| related attacks : | Angriff 1 |
| Convoy : | OB.318 |
| 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. |