U-151 at sea
|Class and type:||Type U-151 U-boat|
|Ordered:||29 November 1916|
|Builder:||Reiherstieg Schiffswerfte & Maschinenfabrik, Hamburg|
|Launched:||4 April 1917|
|Commissioned:||21 July 1917|
|Captured:||Surrendered to France at Cherbourg|
|Fate:||Sunk as target ship at Cherbourg, 7 June 1921|
|General characteristics |
|Class and type:||German Type U 151 submarine|
|Height:||9.25 m (30 ft 4 in)|
|Draught:||5.30 m (17 ft 5 in)|
|Propulsion:||2 × shafts, 2 × 1.60 m (5 ft 3 in) propellers|
|Range:||25,000 nmi (46,000 km; 29,000 mi) at 5.5 knots (10.2 km/h; 6.3 mph) surfaced, 65 nmi (120 km; 75 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged|
|Test depth:||50 metres (160 ft)|
|Complement:||6 officers, 50 enlisted|
SM U-151 or SM Unterseeboot 151 was a World War I U-boat of the Imperial German Navy, constructed by Reiherstieg Schiffswerfte & Maschinenfabrik at Hamburg and launched on 4 April 1917. From 1917 until the Armistice in November 1918 she was part of the U-Kreuzer Flotilla, and was responsible for 34 ships sunk (88,395 tons) and 7 ships damaged (14,292 tons) .
U-151 was originally one of seven Deutschland class U-boats designed to carry cargo between the United States and Germany in 1916. Five of the submarine freighters were converted into long-range cruiser U-boats (U-kreuzers) equipped with two 15 cm (5.9 in) SK L/45 deck guns, including U-151 which was originally to have been named Oldenburg. The Type U 151 class were the largest U-boats of World War I.
U-151 was commissioned on 21 July 1917. From 21 July to 26 December 1917 she was commanded by Waldemar Kophamel who took U-151 on a long-range cruise which eventually covered a total of 12,000 miles. On 19 September 1917 U-151 claimed her first victim, the 3,104-ton French sailing ship Blanche in the Atlantic Ocean. On 2 or 12 October 1917 (sources differ), she collided with the Royal Navy Q-ship HMS Begonia in the Atlantic Ocean off Casablanca, French Morocco, sinking Begonia.   On 20 November 1917 U-151 captured the steamship Johan Mjelde, and scuttled her on 26 November after transferring 22 tons of her cargo of copper.
U-151 left Kiel on 14 April 1918 commanded by Korvettenkapitän Heinrich von Nostitz und Jänckendorff, her mission to attack American shipping. She arrived off the United States East Coast on 21 May, laid mines off the Delaware Capes and cut the submerged telegraph cables which connected New York City with Nova Scotia. On 25 May she stopped three American schooners off Virginia, took their crews prisoner, and sank the three ships by gunfire.
On 2 June 1918, known to some historians as "Black Sunday", U-151 sank six American ships and damaged two others off the coast of New Jersey in the space of a few hours. The next day the tanker Herbert L. Pratt struck a mine previously laid by U-151 in the area but was later salvaged.  Thirteen people died in the seven sinkings, their deaths caused by a capsized lifeboat from SS Carolina. 
On 9 June 1918, U-151 stopped the Norwegian cargo ship Vindeggan off Cape Hatteras, North Carolina. Scuttling charges were rigged aboard her, then she was escorted outside the shipping lane under a prize crew. Von Nostitz then transferred 70 tons of copper ingots from Vindeggan to U-151. 
On 14 June, U-151 sank the Norwegian barque Samoa, en route from Walvis Bay, South-West Africa, to Perth Amboy, New Jersey, with a cargo of copper ore, by gunfire 90 miles off the Virginia coast. There were no casualties. 
On the 18 June, U-151 sank the steamship SS Dwinsk, and then loitered near Dwinsk′s lifeboats in the hopes that more Allied shipping would be attracted to them.  Through this ruse, she launched torpedoes at the U.S. Navy auxiliary cruiser and troopship USS Von Steuben (ID-3017), but missed and was instead depth charged by Von Steuben.
On 28 June 1918, U-151 captured the SS Dictator and made its crew prisoners of war. Among those taken were four men from Newfoundland: Thomas Fiander, Edgar Banfield, Charles Blagdon, and Thomas Bowdridge.
U-151 returned to Kiel on 20 July 1918 after a 94-day cruise in which she had covered a distance of 10,915 nmi (20,215 km; 12,561 mi). Her commander reported that she had sunk 23 ships totalling 61,000 tons and had laid mines responsible for the sinking of another four vessels. 
|Date||Commander||Name||Type||Tonnage [Note 1]||Country||Fate |
|19 Sep 1917||Waldemar Kophamel||Blanche||Sailing vessel||3,104||France||sunk|
|1 Oct 1917||Waldemar Kophamel||Etna||Steamer||5,604||Italy||sunk|
|2 Oct 1917||Waldemar Kophamel||Viajante||Sailing vessel||377||Portugal||sunk|
|4 Oct 1917||Waldemar Kophamel||Bygdønes||Steamer||2,849||Norway||sunk|
|12 Oct 1917||Waldemar Kophamel||Parthian (HMS)||Destroyer||1,025||United Kingdom||Damaged|
|13 Oct 1917||Waldemar Kophamel||Caprera||Steamer||5,040||Italy||sunk|
|19 Oct 1917||Waldemar Kophamel||Harpon||Steamer||1,484||France||Damaged|
|20 Oct 1917||Waldemar Kophamel||Moyori Maru||Steamer||3,746||Japan||sunk|
|21 Oct 1917||Waldemar Kophamel||Gryfevale||Steamer||4,437||United Kingdom||sunk|
|2 Nov 1917||Waldemar Kophamel||Acary||Steamer||4,275||Brazil||sunk|
|2 Nov 1917||Waldemar Kophamel||Guahyba||Steamer||1,891||Brazil||sunk|
|16 Nov 1917||Waldemar Kophamel||Margaret L. Roberts||Sailing vessel||535||United States||sunk|
|21 Nov 1917||Waldemar Kophamel||Sobral||Steamer||1,075||Norway||sunk|
|22 Nov 1917||Waldemar Kophamel||Tijuca||Sailing vessel||2,543||France||sunk|
|23 Nov 1917||Waldemar Kophamel||Trombetas||Sailing vessel||235||Portugal||sunk|
|26 Nov 1917||Waldemar Kophamel||Johan Mjelde||Steamer||2,049||Norway||sunk|
|4 Dec 1917||Waldemar Kophamel||Claudio||Steamer||2,588||Spain||sunk|
|24 May 1918||Waldemar Kophamel||Edna||Sailing vessel||325||United States||Damaged|
|25 May 1918||Heinrich von Nostitz und Jänckendorff||Hattie Dunn||Sailing vessel||435||United States||sunk|
|25 May 1918||Heinrich von Nostitz und Jänckendorff||Hauppauge||Sailing vessel||1,446||United States||Damaged|
|2 Jun 1918||Heinrich von Nostitz und Jänckendorff||Carolina||Passenger steamer||5,093||United States||sunk|
|2 Jun 1918||Heinrich von Nostitz und Jänckendorff||Edward H. Cole||Sailing vessel||1,791||United States||sunk|
|2 Jun 1918||Heinrich von Nostitz und Jänckendorff||Edward R. Baird Jr||Sailing vessel||279||United States||Damaged|
|2 Jun 1918||Heinrich von Nostitz und Jänckendorff||Isabel B. Wiley||Sailing vessel||776||United States||sunk|
|2 Jun 1918||Heinrich von Nostitz und Jänckendorff||Jacob M. Haskell||Sailing vessel||1,778||United States||sunk|
|2 Jun 1918||Heinrich von Nostitz und Jänckendorff||Texel||Steamer||3,210||United States||sunk|
|2 Jun 1918||Heinrich von Nostitz und Jänckendorff||Winneconne||Steamer||1,869||United States||sunk|
|3 Jun 1918||Heinrich von Nostitz und Jänckendorff||Samuel C. Mengel||Sailing vessel||915||United States||sunk|
|3 Jun 1918||Heinrich von Nostitz und Jänckendorff||Herbert L. Pratt||Tanker||7,145||United States||Damaged|
|4 Jun 1918||Heinrich von Nostitz und Jänckendorff||Eidsvold||Steamer||1,570||Norway||sunk|
|5 Jun 1918||Heinrich von Nostitz und Jänckendorff||Harpathian||Steamer||4,588||United Kingdom||sunk|
|5 Jun 1918||Heinrich von Nostitz und Jänckendorff||Vinland||Steamer||1,143||Norway||sunk|
|8 Jun 1918||Heinrich von Nostitz und Jänckendorff||Pinar Del Rio||Steamer||2,504||United States||sunk|
|10 Jun 1918||Heinrich von Nostitz und Jänckendorff||Henrik Lund||Steamer||4,226||Norway||sunk|
|10 Jun 1918||Heinrich von Nostitz und Jänckendorff||Vindeggen||Steamer||3,179||Norway||sunk|
|14 Jun 1918||Heinrich von Nostitz und Jänckendorff||Kringsjaa||Sailing vessel||1,750||Norway||sunk|
|14 Jun 1918||Heinrich von Nostitz und Jänckendorff||Samoa||Sailing vessel||1,138||Norway||sunk|
|18 Jun 1918||Heinrich von Nostitz und Jänckendorff||Dwinsk||Passenger steamer||8,173||United Kingdom||sunk|
|22 Jun 1918||Heinrich von Nostitz und Jänckendorff||Chilier||Steamer||2,966||Belgium||sunk|
|23 Jun 1918||Heinrich von Nostitz und Jänckendorff||Augvald||Steamer||3,406||Norway||sunk|
|28 Jun 1918||Heinrich von Nostitz und Jänckendorff||Dictator||Sailing vessel||125||United Kingdom||sunk|
- USS Von Steuben, one of the ships she unsuccessfully attacked in 1918.
- Tonnages are in gross register tons
- Gröner 1991, pp. 20-21.
- Helgason, Guðmundur. "Ships hit by U 151". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 5 June 2018.
- "BRITISH NAVAL VESSELS LOST AT SEA Part 1 of 2 - Abadol (oiler) to Lynx (destroyer)". Naval History. Retrieved 2 February 2013.
- "HMS BEGONIA". Clydebuilt. Retrieved 3 February 2013.
- Evening Public Ledger 1918, p. 1
- ""Black Sunday" – Victims of U-151". Scuba Diving – New Jersey & Long Island New York. Archived from the original on 2 March 2009.
- Hadley, Michael L.; Roger Flynn Sarty (1991). Tin-pots and Pirate Ships. McGill-Queen's Press. pp. 244–245. ISBN 0-7735-0778-7.
- "S/S C. F. Tietgen, Scandinavian America Line". Norway-Heritage. Retrieved 20 February 2008.
- Gibson 2002, p. 308.
- McCartney 2002.
- Evening Public Ledger (June 5, 1918). "Stung by the Sea Asp, the Tanker Pratt lay partially submerged off Lewes". Evening Public Ledger. Philadelphia. OCLC 701513196. Retrieved June 5, 2018.
- Gibson, R.H.; Prendergast, Maurice (2002). The German Submarine War 1914-1918. Periscope Publishing Ltd. ISBN 1-904381-08-1.
- Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.
- Jung, Dieter (2004). Die Schiffe der Kaiserlichen Marine 1914-1918 und ihr Verbleib [German Imperial Navy ships 1914-1918 and their fate] (in German). Bonn: Bernard & Graefe. ISBN 3-7637-6247-7.
- McCartney, Innes (2002). Lost Patrols: Submarine Wrecks of the English Channel.
- Helgason, Guðmundur. "WWI U-boats: U 151". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net.
- For a discussion of the impact of this boat on the U.S. submarine effort in WWI
- Photo, Herbert L. Pratt grounded after making way inshore.