Nummer: 15103c
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 23.02.1943 |
| Time of attack : | 07:40 |
| Nationality of U-boat : | German |
| U-boat : | U 186 |
| Commander : | Hesemann |
| Grid : | BD 4835 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 5000 BRT |
| presumed result : | damaged |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | ON.166 |
| Date of observation : | 23.02.1943 |
| Nationality of target : | Dutch |
| Actual type of target : | Motor Freighter |
| Name of target : | Madoera |
| Year of launch : | 1922 |
| Actual tonnage : | 9382 BRT |
| Actual result : | target visibly missed |
| Footnote : | U-186 heard two detonations on different targets after a stern spread, but only "Eulima" was hit. - U-186 finally sank "Eulima" with a coup de grâce on 23/1130. |
| related attacks : | Angriff 1 Angriff 2 Angriff 3 |
| Convoy : | ON.166 |
| 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) |
| updated on: | 00.00.0000 |
| Remark: | Madoera |