SM U-71
Introduction '''SM ''U-71''''' was one of 329 submarines serving in the Imperial German Navy in World War I. ''U-71'' was engaged in the naval warfare and took part in the First Battle of the Atlantic.
Design German Type UE I submarines were preceded by the longer Type U 66 submarines. ''U-71'' had a displacement of  when at the surface and  while submerged. She had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two  engines for use while surfaced, and two  engines for use while submerged. She had two propeller shafts. She was capable of operating at depths of up to .The submarine had a maximum surface speed of  and a maximum submerged speed of . When submerged, she could operate for  at ; when surfaced, she could travel  at . ''U-71'' was fitted with two  torpedo tubes (one at the starboard bow and one starboard stern), four torpedoes, and one  deck gun. She had a complement of thirty-two (twenty-eight crew members and four officers).
Operations ''U-71'' came off the stocks at Hamburg (Vulcan) in January 1916, and joined the Kiel School where she remained until 7 April 1916, when she entered the North Sea to join the 1st Half Flotilla. *12 April - ? 21 April 1916.Apparently cruising in North Sea. *21 June – 8 July 1916.Northabout. Laid mines off Skerryvore. *14 October – 4 November 1916.Skagerrak. Sank 3 S.S., 1 sailing vessel. *11–23 December 1916.North Sea. Sank 2 S.S., 2 sailing vessels. *10–22 January 1917.Minelaying in North Sea, St. Magnus Bay, Shetland Isles. Returned owing to bad weather and overheating of engine. *6–21 February 1917.? Laid mines in Loch Ewe, North Minch, off Butt of Lewis, Broad Bay and Firth of Lorne. *At sea 16 May 1917 – 8 June 1917.Possible laid mines off Tory I. Sank 1 S.S., 2 sailing vessels. *7–26 July 1917.North Sea. Locality of her mines not fixed. Sank 223 tons. *1/5 September 1917.Went out 3 times and returned, the last time with defects. *10–14 October 1917.In Baltic. Returned with defects. *20–24 December 1917.Laid mines off Dutch coast. *29 December 1917 – 2 January 1918.Laid mines off Dutch coast. ? Took 1 prize. *18–23 January 1918.Laid mines off Dutch coast. *4–15 February 1918.Laid mines off Dutch coast. Emerged from Skagerrak and returned by Sound. *18–29 March 1918.Laid mines off Dutch coast. Went out by Skagerrak. Returned to Bight. *23 April – 2 May 1918.Laid mines off Firth of Forth. *18–24 June 1918.Laid mines off Aberdeen. *Early in July – 22 July 1918.Laid mines off Firth of Forth.*? 29 September – 11 October 1918.? Dutch coast. Submarine reports "Task given up". *23 February 1919.Surrendered at Harwich.
Summary of raiding history DateNameNationalityTonnageFate18 October 1916''Greta''1,370Sunk19 October 1916''Mercur''711Sunk19 October 1916''Normandie''1,342Sunk21 October 1916''Rönnaug''1,331Sunk13 December 1916''Solon''137Sunk17 December 1916''Sjofna''528Sunk18 December 1916''Herø''1,106Sunk18 December 1916''Sieka''119Sunk19 February 1917''Halcyon''190Sunk4 June 1917''Orion''1,870Sunk5 June 1917''C. Thorén''269Sunk5 June 1917''Götha''232Sunk20 July 1917''Sirra''223Sunk26 July 1917''Flore''3,553Sunk26 July 1917''Ethelwynne''3,230Damaged14 August 1917''Majorka''1,684Sunk31 August 1917''Taurus''128Sunk20 October 1917HMT ''Thomas Stratten''309Sunk12 December 1917''Amadavat''171Sunk31 December 1917''De Hoop''82Captured as prize15 August 19181,801Sunk15 August 1918HMS ''Ulleswater''930Sunk20 August 1918HMS ''Shirley''820Damaged
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