Nummer: 07009b
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 24.10.1941 |
| Time of attack : | 06:37 |
| Nationality of U-boat : | German |
| U-boat : | U 564 |
| Commander : | Suhren |
| Grid : | CG 8492 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 5000 BRT |
| presumed result : | damaged |
| Number of torpedoes/mines : | - |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | HG.75 |
| Date of observation : | 24.10.1941 |
| Time of observation : | 05:50 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Ariosto |
| Year of launch : | 1940 |
| Actual tonnage : | 2176 BRT |
| Actual result : | sunk |
| Position of target : | 36.20n 10.50w |
| Footnote : | U-564 fired five torpedoes. The first three exploded with red fire columns on different ships after 41 sec, 31 sec and 21 sec. The last two torpedoes were heard detonating after 3:14 min and 3:56 min. |
| related attacks : | Angriff 1 Angriff 2 Angriff 3 Angriff 4 |
| Convoy : | HG.75 |
| Route of convoy : | Gibraltar - United Kingdom (home) |
| Remark to convoy : | Sep 1939 to Sep 1942, then MKF und MKS |