|Ordered:||29 November 1916|
|Builder:||Atlas Werke, Bremen|
|Launched:||17 April 1917|
|Commissioned:||22 August 1917|
|Fate:||Sunk in the Northern Barrage minefield on 25 September 1918. 77 dead.|
|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-156[Note 1] was a German Type U 151 U-boat commissioned in 1917 for the Imperial German Navy. From 1917 until her disappearance in September 1918 she was part of the U‑Kreuzer Flotilla, and was responsible for sinking 44 ships and damaging three others, including a warship. She took part in the Attack on Orleans.
U-156, built by the Atlas Werke in Bremen, 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-156. They were the largest U-boats of World War I.
U-156 was launched on 17 April 1917 and commissioned on 22 August 1917 under Konrad Gansser, who commanded her until 31 December 1917, following which Richard Feldt took command of her on 1 January 1918.
On 15 June 1918, U-156 sailed with 77 crew. She passed through the North Sea, negotiated the Northern Passage around the northern end of the British Isles, and out into the Atlantic Ocean where she sailed for Long Island. She then proceeded to New York Harbor, where she had been ordered to lay mines. Records show that she was to lay a field of mines in the shipping lane along the south shore of Long Island, just east of the Fire Island lightship.
On 8 July 1918 U-156 stopped and scuttled the Norwegian owned Manx King at , which was traveling between New York and Rio de Janeiro. Captain Rasmus Emil Halvorsen and her crew were rescued from the lifeboats after 27 hours by DS Anchites of Liverpool, England.
On 21 July 1918 U-156 opened fire on the American town of Orleans, Massachusetts, and several nearby merchant vessels. She sank a tugboat and four barges. HS-1L flying boats and R-9 seaplanes were dispatched from the Chatham Naval Air Station and bombed the enemy raider with bombs that failed to explode. It was the first time in history that American aviators engaged an enemy vessel in the western Atlantic. The Attack on Orleans was the only Central Powers raid mounted against the United States mainland during World War I and the first time the Continental United States was shelled by a foreign power's artillery since the Siege of Fort Texas in 1846.
U-156 had meanwhile headed north to attack the US fishing fleet. She sank 21 fishing boats in the Gulf of Maine area, from Cape Cod to the Bay of Fundy, ranging from the 72 ton schooner Nelson A. (4 August) to the 766 ton Dornfontein (2 August).
U-156 has been credited with the sinking of the tanker Luz Blanca, just off the headlands of Halifax on August 5/1918. On 20 August, U-156 captured the Canadian trawler Triumph southwest of Canso, Nova Scotia. They manned and armed the vessel, and used it in conjunction with the submarine to capture and sink seven other fishing boats in the Grand Banks area, before eventually scuttling her.
On 25 September 1918 and in the following days, U-156 failed to report that she had cleared the Northern barrage minefield between the United Kingdom and Norway on her return voyage to Germany. U-156 is presumed to have struck a mine of the Northern Barrage during the last leg of her cruise. Prior to her arrival at the northern end of the barrage she had radioed the estimated time and exact route she planned to take through the mines. The British intercepted this message, decoded it, and sent a submarine to ambush U-156. U-156 escaped the trap by diving but likely attempted to transit the barrage while underwater. The 77 crew on board were never heard from again.
Summary of raiding history
|7 Dec 1917||Konrad Gansser||W.c. Mc Kay||Sailing vessel||147||Canada||sunk|
|15 Dec 1917||Konrad Gansser||Ioannina||Steamer||4,567||Greece||sunk|
|17 Dec 1917||Konrad Gansser||Acoriano||Sailing vessel||312||Portugal||sunk|
|30 Dec 1917||Konrad Gansser||Joaquin Mumbru||Steamer||2,703||Spain||sunk|
|10 Jan 1918||Konrad Gansser||Atlas||Steamer||1,813||Netherlands||sunk|
|8 Feb 1918||Konrad Gansser||Artesia||Tanker||2,762||United Kingdom||sunk|
|8 Feb 1918||Konrad Gansser||Chariton||Steamer||3,023||Greece||sunk|
|8 Feb 1918||Konrad Gansser||Nuzza||Sailing vessel||1,102||Italy||sunk|
|9 Feb 1918||Konrad Gansser||Atlantide||Steamer||5,431||Italy||sunk|
|26 Jun 1918||Richard Feldt||Tortuguero||Steamer||4,175||United Kingdom||sunk|
|7 Jul 1918||Richard Feldt||Marosa||Sailing vessel||1,987||Norway||sunk|
|8 Jul 1918||Richard Feldt||Manx King||Sailing vessel||1,729||Norway||sunk|
|19 Jul 1918||Richard Feldt||San Diego||Armored cruiser||13,680||United States||sunk|
|21 Jul 1918||Richard Feldt||703||Barge||934||United States||sunk|
|21 Jul 1918||Richard Feldt||740||Barge||680||United States||sunk|
|21 Jul 1918||Richard Feldt||766||Barge||527||United States||sunk|
|21 Jul 1918||Richard Feldt||Lansford||Barge||830||United States||sunk|
|21 Jul 1918||Richard Feldt||Perth Amboy||Tug||435||United States||damaged|
|22 Jul 1918||Richard Feldt||Robert & Richard||Fishing vessel (sail)||140||United States||sunk|
|2 Aug 1918||Richard Feldt||Dornfontein||Auxiliary motor||766||Canada||sunk|
|3 Aug 1918||Richard Feldt||Annie Perry||Fishing vessel (sail)||116||United States||sunk|
|3 Aug 1918||Richard Feldt||Muriel||Fishing vessel (sail)||120||United States||sunk|
|3 Aug 1918||Richard Feldt||Rob Roy||Motor fishing vessel||111||United States||sunk|
|3 Aug 1918||Richard Feldt||SYDNEY B. ATWOOD||100||United States||sunk|
|4 Aug 1918||Richard Feldt||Nelson A.||Fishing vessel (sail)||72||United Kingdom||sunk|
|5 Aug 1918||Richard Feldt||AGNES G. HOLLAND||Trawler||100||United States||sunk|
|5 Aug 1918||Richard Feldt||Gladys M. Hollett||Fishing vessel (Sail)||203||United Kingdom||damaged|
|5 Aug 1918||Richard Feldt||Luz Blanca||Tanker||4,868||Canada||sunk|
|8 Aug 1918||Richard Feldt||Sydland||Steamer||3,031||Sweden||sunk|
|11 Aug 1918||Richard Feldt||Penistone||Steamer||4,139||United Kingdom||sunk|
|17 Aug 1918||Richard Feldt||San Jose||Steamer||1,586||Norway||sunk|
|20 Aug 1918||Richard Feldt||A. Piatt Andrew||Fishing vessel (sail)||141||United States||sunk|
|20 Aug 1918||Richard Feldt||Francis J. O'hara Jr.||Fishing vessel (sail)||117||United States||sunk|
|20 Aug 1918||Richard Feldt||Lucille M. Schnare||Fishing vessel (sail)||121||Canada||sunk|
|20 Aug 1918||Richard Feldt||Pasadena||Fishing vessel (sail)||119||Canada||sunk|
|20 Aug 1918||Richard Feldt||Triumph||Trawler||239||Canada||sunk|
|20 Aug 1918||Richard Feldt||Uda A. Saunders||Fishing vessel (sail)||125||Canada||sunk|
|21 Aug 1918||Richard Feldt||Sylvania||Fishing vessel (sail)||136||United States||sunk|
|22 Aug 1918||Richard Feldt||Notre Dame De La Garde||Fishing vessel (sail)||147||France||sunk|
|25 Aug 1918||Richard Feldt||C. M. Walters||Fishing vessel (sail)||107||Canada||sunk|
|25 Aug 1918||Richard Feldt||E. B. Walters||Fishing vessel (sail)||126||Canada||sunk|
|25 Aug 1918||Richard Feldt||Erik||Steamer||583||United Kingdom||sunk|
|25 Aug 1918||Richard Feldt||J. J. Flaherty||Fishing vessel (sail)||162||United States||sunk|
|25 Aug 1918||Richard Feldt||Marion Adams||Fishing vessel (sail)||99||Canada||sunk|
|25 Aug 1918||Richard Feldt||Verna D. Adams||Fishing vessel (sail)||132||Canada||sunk|
|25 Aug 1918||Richard Feldt||Clayton W. Walters||Fishing vessel (sail)||116||Canada||sunk|
|26 Aug 1918||Richard Feldt||Gloaming||Fishing vessel (sail)||130||Canada||sunk|
- "SM" stands for "Seiner Majestät" (English: His Majesty's) and combined with the U for Unterseeboot would be translated as His Majesty's Submarine.
- Tonnages are in gross register tons
- Gröner 1991, pp. 20-21.
- Sheard, p. 114
- Bleyer, Bill. "The Sinking of the San Diego". Newsday. Archived from the original on 13 August 2007.
- Larson, Christina (13 December 2018). "Scientists scour WWI shipwreck to solve military mystery". The Associated Press.
“We believe that U-156 sunk San Diego,” said Alexis Catsambis, an underwater archaeologist with the Navy.
- Sheard, p. 117
- Sarty, Roger (2012). War in the St. Lawrence. Toronto, Ontario, Canada: Allen Lane, Penguin Canada. ISBN 978-0-670-06787-9.
- Halpern, Paul G. (1994). A Naval History of World War I. Routledge. p. 433. ISBN 1-85728-498-4.
- Hodos, Paul (2017). The Kaiser's Lost Kreuzer (1st ed.). Jefferson, North Carolina: McFarland Publishing. pp. 164–165. ISBN 978-1476671628. Retrieved 20 December 2017.
- Helgason, Guðmundur. "Ships hit by U 156". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 25 August 2018.
- Gibson, R.H.; Maurice Prendergast (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.CS1 maint: ref=harv (link)
- Sheard, Bradley (1997). Lost Voyages: Two Centuries of Shipwrecks in the Approaches to New York. Aqua Quest Publications, Inc. ISBN 1-881652-17-3.
- Helgason, Guðmundur. "WWI U-boats: U 156". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net.