# SM U-55

SM U-55 was one of the six Type U-51 U-boats of the Imperial German Navy during the First World War.

## Construction and commissioning

U-55 was ordered from Germaniawerft, Kiel on 23 August 1914, was laid down on 28 December 1914 and launched on 18 March 1916. She was commissioned under her first commander Wilhelm Werner on 8 June 1916.

## In German service

Werner commanded her for most of her wartime career, during which she undertook 14 patrols with II Flotilla, sinking 61 merchant ships for a total of 126,010 GRT. She also damaged another seven for a total of 26,161 gross register tons (GRT), and took another two as prizes for a total of 3,466 GRT. Her most famous act was the sinking of the British passenger liner RMS Carpathia with three torpedoes, on 17 July 1918, off the east coast of Ireland. Carpathia herself had become famous for her actions in coming to the rescue of the sinking RMS Titanic in 1912. U-55 also sank the hospital ship HMHS Rewa on 4 January 1918.
Werner was replaced by Alexander Weiss on 10 August 1918, Weiss being succeeded by Hans Friedrich on 15 September and commanding U-55 until the armistice on 11 November 1918.

## In Japanese service

On 26 November 1918 U-55 was surrendered to the Royal Navy at Harwich, along with the rest of the surviving U-Boat fleet. It was subsequently handed over to Japan, and entered service with the Imperial Japanese Navy in 1920 as O-3, serving as such until 1921. It was dismantled at the Sasebo Navy Yard between March and June 1921, briefly recommissioning in 1923 as Auxiliary Vessel No. 2538.

## Summary of raiding history

| Date | Name | Nationality | Tonnage | Fate |
| 28 September 1916 | HMT Orsino | Royal Navy | 172 | Sunk |
| 30 September 1916 | Atle | Sweden | 1,725 | Captured as prize |
| 30 September 1916 | Talavera | Sweden | 1,741 | Captured as prize |
| 24 October 1916 | Clearfield | United Kingdom | 4,229 | Sunk |
| 28 October 1916 | Marina | United Kingdom | 5,204 | Sunk |
| 22 January 1917 | Ethel | United Kingdom | 23 | Sunk |
| 23 January 1917 | Eden | Russia | 142 | Sunk |
| 23 January 1917 | Salland | Netherlands | 3,657 | Sunk |
| 27 January 1917 | Artist | United Kingdom | 3,570 | Sunk |
| 30 January 1917 | Euonymus | United Kingdom | 60 | Sunk |
| 30 January 1917 | Helena And Samuel | United Kingdom | 59 | Sunk |
| 30 January 1917 | Marcelle | Belgium | 219 | Sunk |
| 30 January 1917 | Merit | United Kingdom | 39 | Sunk |
| 30 January 1917 | Trevone | United Kingdom | 46 | Sunk |
| 30 January 1917 | W.A.H. | United Kingdom | 47 | Sunk |
| 30 January 1917 | Wetherill | United Kingdom | 46 | Sunk |
| 31 January 1917 | Dundee | Canada | 2,290 | Sunk |
| 31 January 1917 | Saint Leon | France | 230 | Sunk |
| 31 January 1917 | Yvonne | France | 87 | Sunk |
| 1 February 1917 | Ada | United Kingdom | 24 | Sunk |
| 1 February 1917 | Essonite | United Kingdom | 589 | Sunk |
| 1 February 1917 | Inverlyon | United Kingdom | 59 | Sunk |
| 2 February 1917 | Pomoschnick | Russia | 167 | Sunk |
| 6 February 1917 | Saxon Briton | United Kingdom | 1,337 | Sunk |
| 7 February 1917 | Yola | United Kingdom | 3,504 | Sunk |
| 4 April 1917 | H. B. Linnemann | Denmark | 444 | Damaged |
| 5 April 1917 | Vilja | Norway | 1,049 | Sunk |
| 6 April 1917 | Vine Branch | United Kingdom | 3,442 | Sunk |
| 8 April 1917 | Petridge | United Kingdom | 1,712 | Sunk |
| 8 April 1917 | Torrington | United Kingdom | 5,597 | Sunk |
| 8 April 1917 | Umvoti | United Kingdom | 2,616 | Sunk |
| 12 April 1917 | Toro | United Kingdom | 3,066 | Sunk |
| 15 April 1917 | Astræa | Denmark | 260 | Sunk |
| 17 April 1917 | Cairnhill | United Kingdom | 4,981 | Sunk |
| 8 June 1917 | Russian Prince | United Kingdom | 4,158 | Damaged |
| 9 June 1917 | Achilles | United Kingdom | 641 | Sunk |
| 11 June 1917 | Ausonia | United Kingdom | 8,153 | Damaged |
| 12 June 1917 | Coronado | United Kingdom | 6,539 | Damaged |
| 23 June 1917 | Sophie | Denmark | 89 | Sunk |
| 23 June 1917 | Star | Denmark | 120 | Sunk |
| 31 July 1917 | Belgian Prince | United Kingdom | 4,765 | Sunk |
| 6 August 1917 | Eugenia | Italy | 4,835 | Sunk |
| 9 August 1917 | Oakfield | United Kingdom | 3,618 | Damaged |
| 12 August 1917 | Falkland | Norway | 4,877 | Sunk |
| 17 August 1917 | Edina | United Kingdom | 455 | Sunk |
| 18 August 1917 | HMT Benjamin Stevenson | Royal Navy | 255 | Sunk |
| 4 January 1918 | HMHS Rewa | Royal Navy | 7,305 | Sunk |
| 5 January 1918 | War Baron | United Kingdom | 6,240 | Sunk |
| 9 January 1918 | Ula | Norway | 839 | Sunk |
| 16 January 1918 | Genevieve | France | 1,598 | Sunk |
| 20 January 1918 | Hirondelle | France | 28 | Sunk |
| 21 January 1918 | Maria Caterina | Netherlands | 71 | Sunk |
| 26 February 1918 | Eumaeus | United Kingdom | 6,696 | Sunk |
| 26 February 1918 | Mouche | France | 65 | Sunk |
| 1 March 1918 | Borga | United Kingdom | 1,046 | Sunk |
| 7 March 1918 | Brise | France | 160 | Sunk |
| 7 March 1918 | Saint Georges | France | 102 | Sunk |
| 7 March 1918 | Saint Joseph | France | 434 | Sunk |
| 8 March 1918 | Madeline | United Kingdom | 2,890 | Sunk |
| 10 March 1918 | Cristina | Spain | 2,083 | Sunk |
| 15 May 1918 | War Grange | United Kingdom | 3,100 | Damaged |
| 16 May 1918 | Tagona | Canada | 2,004 | Sunk |
| 17 May 1918 | Motricine | France | 4,047 | Sunk |
| 18 May 1918 | Denbigh Hall | United Kingdom | 4,943 | Sunk |
| 18 May 1918 | Scholar | United Kingdom | 1,635 | Sunk |
| 16 July 1918 | Miefield | Norway | 1,368 | Sunk |
| 17 July 1918 | Carpathia | United Kingdom | 13,603 | Sunk |
| 23 July 1918 | Anna Sofie | United Kingdom | 2,577 | Sunk |
| 31 July 1918 | Zwaantje Cornelia | Netherlands | 149 | Damaged |
| 1 October 1918 | Montfort | United Kingdom | 6,578 | Sunk |
| 2 October 1918 | Keltier | Belgium | 2,360 | Sunk |
| 4 October 1918 | Uranus | Russia | 350 | Sunk |
| 10 October 1918 | Andre | France | 160 | Sunk |

## Original documents from Room 40

   The following is a verbatim transcription of the recorded activities of SM U-55 known to British Naval Intelligence, Room 40 O.B.:
   "SM U-55.
   Kptlt. Wilhelm Werner. Was completed at Kiel about the beginning of June 1916, did trials at the Kiel School until about 28th July 1916 and then entered the North Sea, joining the 2nd Half Flotilla.
   * 30th July – 4th August 1916. ? Trial cruises in North Sea.
   * 19th August – 21st August 1916. Bight patrol.
   * 20th September – 1st October 1916. To west of Orkney Islands. Sank 1 armed trawler. Took 2 prizes.
   * 14th October – 9th November 1916. Northabout to S.W. of Ireland. Sank ? 3 S.S.
   * 20th January – 11th February 1917. Atlantic via Channel. Claims 7 S.S., 13 sailing vessels (23,000 tons).
   * 4th March – 9th March 1917. To the west through the Channel. Returned damaged through touching ground in fog.
   * 30th March - ? 23rd April 1917. To S.W. of Ireland and Channel approaches, uncertain whether northabout or through the Channel. Back northabout. Claims sinkings 7 S.S., 2 sailing vessels (24,300 tons.) Prisoners, 5 English captains, 3 gunners. Booty, 1 gun. Amongst ships sunk was S.S. TORRINGTON (8th April). Crew was taken on board submarine. Master sent below. Submarine then dived leaving crew to drown.
   * 31st May – 26th June 1917. To S.W. of Ireland, northabout both ways. Sank 3 S.S., 1 sailing vessel.
   * 26th July – 21st August 1917. To S.W. of Ireland, possibly passing S.W. of Faroes on the way home. Claims 5 S.S. (19,200 tons).
   * 26th September – 23rd October 1917. Apparently patrolling S. of Faroes. At Klaksvig (Faroes) October 17th/18th. Returned by Sound.
   * 29th December 1917 – 23rd January 1918. To south of Ireland, Channel both ways. Possibly attacked by H.M. submarine E51 in 54°47'N., 6°18'E. Sank British hospital ship REWA by torpedo in 50°48'N., 4°48'W. Claims 5 S.S., 2 sailing vessels (18,000 tons).
   * 18th February – 17th March 1918. Through Channel to western approaches. Back northabout. Hit by torpedo, which did not explode hospital ship GUILDFORD CASTLE. Was chased and fired at by H.M. submarine K7 on March 15th. Returned with machinery out of order. Claims 8 ships (14,000 tons).
   * 8th May – 30th May 1918. To Channel approaches. Route - Bight, Fair Island both ways, Sound. She may have been depth-charged on 18th, 20th, 21st May, and attacked by H.M. submarine E38 on 25th May in 57°52'N., 8°13'W. Sank 5 S.S. (25,000 tons). ? 8th July - ? 2nd August 1918. Northabout to S.W. of Ireland. Back northabout and Little Belt. Sank S.S. CARPATHIA, 1 S.S., 1 sailing vessel.
   * 1st September – 19th October 1918. Atlantic, northabout both ways. Possibly sank 3 S.S., 2 sailing vessels. (Claims 2 S.S., 2 sailing vessels plus 8,900 tons). Attacked by U.S.S. SAVAGE on October 1st in 48°5'N., 10°5'W. Returned owing to damage to deck.
   * 27th November 1918. Surrendered at Harwich."
   Note: S.S. = Steam Ship; S.V. = Sailing Vessel; northabout, Muckle Flugga, Fair I. = around Scotland; Sound, Belts, Kattegat = via North of Denmark to/from German Baltic ports; Bight = to/from German North Sea ports; success = sinking of ships