Nummer: 18221a
| Area : | Western Area |
| Sea area : | English Channel |
| Date of attack : | 05.07.1944 |
| Time of attack : | 21:45 |
| Nationality of U-boat : | German |
| U-boat : | U 763 |
| Commander : | Cordes |
| Grid : | BF 3533 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 4000 BRT |
| presumed result : | damaged |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Convoy : | unknown |
| Footnote : | U-763 reported a gnat detonation after 6:28 min, a LTU detonation after 11:48 min and a gnat end-of-run detonation after 10:29 min. |
| related attacks : | Angriff 1 Angriff 2 |
| Convoy : | unknown |