Nummer: 01100
| Area : | Western Area |
| Sea area : | Irish Sea |
| Date of minelaying : | 05.12.1939 |
| Nationality of U-boat : | German |
| U-boat : | U 28 |
| Commander : | Kuhnke |
| Grid : | AM 9863 |
| presumed target type : | --- |
| presumed tonnage : | ---- --- |
| presumed result : | hit not ascertained |
| Used weapon(s) : | Sea mine(s) |
| Date of sinking : | 21.01.1940 |
| Time of sinking : | 08:36 |
| Nationality of target : | British |
| Actual type of target : | Passenger Liner |
| Name of target : | Protesilaus |
| Year of launch : | 1910 |
| Actual tonnage : | 9577 BRT |
| Actual result : | sunk |
| Position of target : | 51.31n 04.04w Bristol Ch |
| Footnote : | "Protesilaus" was beached in damaged condition and sank later, when being towed to harbour. |
| updated on: | 31.01.2005 |
| Remark: | Anm. |
| Changes: | 1) Cloots, 6.11.1995: ... 2) Goretzki, 31.1.05: Anmerkung |