Nummer: 18204a
| Area : | Western Area |
| Sea area : | English Channel |
| Date of attack : | 29.06.1944 |
| Time of attack : | 15:28 |
| Nationality of U-boat : | German |
| U-boat : | U 984 |
| Commander : | Sieder |
| Grid : | BF 3532 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 8000 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo with gyro-angle and zig-zaggig course |
| Convoy : | EMC.17 |
| Date of observation : | 29.06.1944 |
| Time of observation : | 13:32 |
| Nationality of target : | American |
| Actual type of target : | Steam Freighter |
| Name of target : | Henry G. Blasdel |
| Year of launch : | 1943 |
| Actual tonnage : | 7176 BRT |
| Actual result : | not repaired, total loss |
| Position of target : | 50.07n 00.47w |
| Footnote : | U-984 fired a spread of two LUT which hit "Henry G. Blasdel" and "Edward M. House", one coup de grâce which did not hit the damaged ships but instead "John A. Treutlen", and one gnat which hit "James A. Farrell". |
| related attacks : | Angriff 1 Angriff 2 Angriff 3 |
| Convoy : | EMC.17 |
| Route of convoy : | Belfast - France |
| Remark to convoy : | Series of invasion convoys for Op. Neptune (June 1944) |
| updated on: | 00.00.0000 |
| Remark: | H.G. Blasdel |