Nummer: 16215a
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 12.04.1943 |
| Time of attack : | 01:30 |
| Nationality of U-boat : | German |
| U-boat : | U 404 |
| Commander : | Bülow |
| Grid : | BC 3149 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 10000 BRT |
| presumed result : | damaged |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | ON.176 |
| Footnote : | U-404 fired two FAT- and two G7e- torpedoes, and heard one premature and three other detonations after 6:12 min, 7:45 min, and 3:45 min. |
| related attacks : | Angriff 1 Angriff 2 |
| Convoy : | ON.176 |
| 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) |