Nummer: 03309b
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 18.10.1940 |
| Time of attack : | 23:09 |
| Nationality of U-boat : | German |
| U-boat : | U 101 |
| Commander : | Frauenheim |
| Grid : | AM 2952 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 3500 BRT |
| presumed result : | sunk |
| Number of torpedoes/mines : | - |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | SC.7 (33) |
| Date of observation : | 18.10.1940 |
| Nationality of target : | Swedish |
| Actual type of target : | Steam Freighter |
| Name of target : | Gunborg |
| Year of launch : | 1930 |
| Actual tonnage : | 1572 BRT |
| Actual result : | sunk |
| Position of target : | 57.14n 11w |
| related attacks : | Angriff 1 Angriff 2 |
| Convoy : | SC.7 (33) |
| Route of convoy : | Sydney (Nova Scotia) - United Kingdom |
| Remark to convoy : | Slow (Atlantic) Convoys since Aug 1940, fast ones = HX, counter traffic = ON. |