|Operator:||Holland America Line|
|Builder:||Harland & Wolff
|Launched:||18 February 1897|
|Maiden voyage:||18 August 1897|
|Fate:||sold 5 April 1906 to Scandinavian America Line|
|Name:||SS C.F. Tietgen|
|Namesake:||Carl Frederik Tietgen|
|Operator:||Scandinavian America Line|
|Acquired:||5 April 1906|
|Fate:||sold to Russian American Line 1913|
|Operator:||Russian American Line
|Maiden voyage:||10 February 1914|
|Fate:||sunk 18 June 1918 by U-151|
|Tonnage:||8,173 gross tons|
|Length:||469.5 ft (143.1 m)|
|Beam:||53.1 ft (16.2 m)|
|Depth:||22.7 ft (6.9 m)|
|Propulsion:||triple-expansion steam engine|
|Speed:||14 knots (26 km/h; 16 mph)|
SS Dwinsk was a British-flagged ocean liner sunk by U-151 in World War I. The ship was previously the third Rotterdam for the Holland America Line, C.F. Tietgen for the Scandinavian America Line, and, as Dwinsk, for the Russian American Line. The ship was put under Cunard Line management in 1917, and sailed under the British flag until sunk on 18 June 1918.
SS Rotterdam was launched 18 February 1897 by Harland & Wolff in Belfast for the Holland America Line, the third ship by that name for the line. She sailed from Rotterdam, her namesake city, to Boulogne and New York on her maiden voyage 18 August 1897. The ship began its final voyage on this route on 17 February 1906.
Purchased by the Scandinavian America Line on 5 April 1906, the ship was renamed C.F. Tietgen after Carl Frederik Tietgen, a Danish merchant. The ship operated primarily on a Copenhagen-Kristiania-Kristiansand-New York route through 1913. On 28 June 1906 the Tietgen collided with and sank the schooner E. G. Hay without loss of life. In July 1913 the ship was chartered to Nordisk Film A/S for the filming of Atlantis.
Later in 1913, the ship was sold to the Russian American Line and renamed Dwinsk, and operating between Libau and New York from 10 February 1914. On 20 September 1914, Dwinsk began sailing on an Archangel-Hammerfest-New York route.
In 1917, control of the ship passed to Cunard Line who reflagged her under the British flag, and retaining her existing name. On 18 June 1918, under the command of Captain Henry Nelson, while steaming from France to Newport News, Virginia, Dwinsk was torpedoed by U-151 about 400 miles (640 km) from Bermuda. After the ship sank, U-151 remained in the area, using the survivors in seven lifeboats as a lure to try to sink additional Allied ships.
Six of the lifeboats were rescued by other ships; the seventh lifeboat, in the charge of the Second Officer, Joseph William Coppin (born 1881, St Neot, Cornwall), with 22 men aboard was never heard from again. USS Siboney rescued two boats on 21 June, and USS Rondo picked up the final boat on 28 June.
- "S/S C. F. Tietgen, Scandinavian America Line". Norway-Heritage. Retrieved 20 February 2008.
- "SHIP DESCRIPTIONS - R: ROTTERDAM / C.F.TIETGEN / DWINSK 1897". TheShipsList. 4 April 2007. Retrieved 20 February 2008.
- "Von Stueben". Dictionary of American Naval Fighting Ships. United States Navy. Retrieved 20 February 2008.
- "Siboney". Dictionary of American Naval Fighting Ships. United States Navy. Retrieved 20 February 2008.
- Gleaves, Albert (1921). A History of the Transport Service: Adventures and Experiences of United States Transports and Cruisers in the World War. New York: George H. Doran Company. p. 214. OCLC 976757.
- "Pictures from the S/S Dwinsk (ex. C. F. Tietgen)". Norway-Heritage.
- "Painting of Steamer Rotterdam (U.S. Library of Congress)". LOC, Prints & Photographs Reading Room, Prints & Photographs Online Catalog.