Nummer: 02813b
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 11.09.1940 |
| Time of attack : | 03:27 |
| Nationality of U-boat : | German |
| U-boat : | U 28 |
| Commander : | Kuhnke |
| Grid : | AL 6369 |
| presumed target type : | Tanker |
| presumed tonnage : | 7000 BRT |
| presumed result : | sunk |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | OA.210 |
| Date of observation : | 11.09.1940 |
| Time of observation : | 02:40 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Harpenden |
| Year of launch : | 1930 |
| Actual tonnage : | 4678 BRT |
| Actual result : | damaged |
| Position of target : | 55.34n 15.56w |
| Footnote : | See FN.685 |
| related attacks : | Angriff 1 Angriff 2 |
| Convoy : | OA.210 |
| Route of convoy : | Southend (Themse) - North Aamerica (out) |
| Remark to convoy : | Sep 1939 to Jul 1940 via South Ireland, Jul to Okt 1940 via North Cannel, then ON. |