SM U-71 explained

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

Type UE I submarines were preceded by the longer Type U 66 submarines. U-71 had a displacement of 755t when at the surface and 832t while submerged. She had a total length of 56.8m (186.4feet), a pressure hull length of 46.66m (153.08feet), a beam of 5.9m (19.4feet), a height of 8.25m (27.07feet), and a draught of 4.86m (15.94feet). The submarine was powered by two 900PS engines for use while surfaced, and two 900PS 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 8.8cm (03.5inches) 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.^[1]

• 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

Date	Name	Nationality	Tonnage^[2]	Fate^[3]
18 October 1916	Greta	Sweden	1,370	Sunk
19 October 1916	Mercur	Sweden	711	Sunk
19 October 1916	Normandie	Sweden	1,342	Sunk
21 October 1916	Rönnaug	Norway	1,331	Sunk
13 December 1916	Solon	Denmark	137	Sunk
17 December 1916	Sjofna	Norway	528	Sunk
18 December 1916	Herø	Norway	1,106	Sunk
18 December 1916	Sieka	Netherlands	119	Sunk
19 February 1917	Halcyon	United Kingdom	190	Sunk
4 June 1917	Orion	Denmark	1,870	Sunk
5 June 1917	C. Thorén	Sweden	269	Sunk
5 June 1917	Götha	Sweden	232	Sunk
20 July 1917	Sirra	Netherlands	223	Sunk
26 July 1917	Flore	France	3,553	Sunk
26 July 1917	Ethelwynne	United Kingdom	3,230	Damaged
14 August 1917	Majorka	Norway	1,684	Sunk
31 August 1917	Taurus	United Kingdom	128	Sunk
20 October 1917	HMT Thomas Stratten		309	Sunk
12 December 1917	Amadavat	United Kingdom	171	Sunk
31 December 1917	De Hoop	Netherlands	82	Captured as prize
15 August 1918			1,801	Sunk
15 August 1918	HMS Ulleswater^[4] ^[5] ^[6] ^[7]		930	Sunk
20 August 1918	HMS Shirley		820	Damaged

References

Citations

Bibliography

• Book: Gröner. Erich. Jung. Dieter. Maass. Martin. Thomas. Keith. Magowan. Rachel. 1991. U-boats and Mine Warfare Vessels. 2. German Warships 1815–1945. London. Conway Maritime Press. 0-85177-593-4. CITEREFGröner1991.

Notes and References

1. http://www.nationalarchives.gov.uk/catalogue/displaycataloguedetails.asp?CATLN=6&CATID=3981615&j=1 HW 7/3, Room 40, History of German Naval Warfare 1914-1918
2. Merchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.
3. u71. U 71. 1boat . 13 January 2015.
4. According to other sources, HMS Ulleswater was sunk by .
5. Web site: HMS Ullswater . The Dreadnought Project . 25 November 2022.
6. Book: Randall, Ian . 1997 . Conway's All The World's Fighting Ships 1906-1921 . Conway Maritime . 81 . 978-0851772455.
7. Book: Rower, R.P.P . 2022 . A Concise Chronicle of Events of the Great War. DigiCat . 143.