Nummer: 17113b
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 20.09.1943 |
| Time of attack : | 22:53 |
| Nationality of U-boat : | German |
| U-boat : | U 305 |
| Commander : | Bahr |
| Grid : | AK 0218 |
| presumed target type : | Destroyer |
| presumed result : | sunk |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Convoy : | ON.202 |
| Date of observation : | 20.09.1943 |
| Nationality of target : | British |
| Actual type of target : | Fregate |
| Name of target : | Itchen (K.227) |
| Year of launch : | 1942 |
| Actual tonnage : | 1370 ts |
| Actual result : | target visibly missed |
| Position of target : | 57.30n 31.10w |
| Footnote : | U-305 hit the destroyer "St.Croix", but could definitly sink her with a coup de grâce one hour later. At the same time she missed the British fregate "Itchen". |
| related attacks : | Angriff 1 |
| Convoy : | ON.202 |
| Route of convoy : | United Kingdom - North America |
| Remark to convoy : | 1st series: Jul 1941 to Mar 1943 ON and ONS combined, later ON mit continuing and ONS with new numbering (counter traffic HX and SC) |