Nummer: 17109b
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 20.09.1943 |
| Time of attack : | 09:32 |
| Nationality of U-boat : | German |
| U-boat : | U 238 |
| Commander : | Hepp |
| Grid : | AK 3939 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 5000 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | ON.202 |
| Date of observation : | 20.09.1943 |
| Time of observation : | 08:06 |
| Nationality of target : | American |
| Actual type of target : | Steam Freighter |
| Name of target : | Frederick Douglass |
| Year of launch : | 1943 |
| Actual tonnage : | 7176 BRT |
| Actual result : | damaged |
| Position of target : | 57.03n 28.08w |
| Footnote : | U-238 reported two hits on the ships in pos.21 and pos.11 of the convoy. "Frederick Douglass" was damaged and definitly sunk in the evening by a coup de grâce from U-645. |
| related attacks : | Angriff 1 |
| Convoy : | ON.202 |
| 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) |