SM U-20 (Germany)

Postcard depicting U-20 sinking RMS Lusitania.
History
German Empire
Name:	U-20
Ordered:	25 November 1910
Builder:	Kaiserliche Werft Danzig
Cost:	2,450,000 Goldmark
Yard number:	14
Laid down:	7 November 1911
Launched:	18 December 1912
Commissioned:	5 August 1913
Fate:	Grounded 4 November 1916 and destroyed by her crew the next day.
General characteristics
Class and type:	German Type U 19 submarine
Displacement:	650 t (640 long tons) surfaced 837 t (824 long tons) submerged
Length:	64.15 m (210 ft 6 in)
Beam:	6.10 m (20 ft)
Height:	7.30 m (23 ft 11 in)
Draught:	3.58 m (11 ft 9 in)
Propulsion:	2 shafts 2 × MAN 8-cylinder two stroke diesel motors with 1,700 PS (1,250 kW; 1,680 shp) 2 × AEG double Motordynamos with 1,200 PS (880 kW; 1,180 shp) 320 rpm submerged
Speed:	15.4 knots (28.5 km/h; 17.7 mph) surfaced 9.5 knots (17.6 km/h; 10.9 mph) submerged
Range:	9,700 nautical miles (18,000 km; 11,200 mi) at 8 kn surfaced 80 nautical miles (150 km; 92 mi) at 5 kn submerged
Test depth:	50 m (164 ft 1 in)
Boats & landing craft carried:	1 dinghy
Complement:	4 officers, 31 men
Armament:	4 × 50 cm (19.7 in) torpedo tubes (2 each bow and stern) with 6 torpedoes 1 × 8.8 cm (3.5 in) SK L/30 gun (from 1916 2 ×) 1 × 3.7 cm (1.5 in) Hotchkiss gun
Service record
Part of:	Imperial German Navy: III Flotilla 1 August 1914 – 4 November 1916
Commanders:	Kptlt. Otto Dröscher[1] 1 August – 15 December 1914 Kptlt. Walther Schwieger[2] 16 December 1914 – 5 November 1916[3]
Operations:	7 patrols
Victories:	36 merchant ships sunk (144,300 GRT), including RMS Lusitania.

SM U-20^{[Note 1]} was a German Type U 19 U-boat built for service in the Imperial German Navy. She was launched on 18 December 1912, and commissioned on 5 August 1913. During World War I, she took part in operations around the British Isles. U-20 became infamous following her sinking of the British ocean liner RMS Lusitania on 7 May 1915, an act that dramatically reshaped the course of World War I.

Career

On 7 May 1915, U-20 was patrolling off the southern coast of Ireland under the command of Kapitänleutnant Walther Schwieger. Three months earlier, on 4 February, the Germans had established a U-boat blockade around Great Britain and Ireland and had declared any vessel in it a legitimate target.

At about 13:40 Schwieger was at the periscope and saw a vessel approaching. From a distance of about 700 metres (770 yd) Schwieger noted she had four funnels and two masts, making her a liner of some sort. He recognised her as the Lusitania, a vessel in the British Fleet Reserve, and fired a single torpedo. It hit on the starboard side, almost directly below the bridge. Following the torpedo's explosion, the liner was shattered by a second explosion, possibly caused by either coal dust or a boiler explosion, so large Schwieger himself was surprised. In 18 minutes, Lusitania sank with 1,198 casualties. The wreck lies in 300 feet (91 m) of water.

Fifteen minutes after he had fired his torpedo, Schwieger noted in his war diary:

"It looks as if the ship will stay afloat only for a very short time. [I gave order to] dive to 25 metres (82 ft) and leave the area seawards. I couldn't have fired another torpedo into this mass of humans desperately trying to save themselves."

There was at the time and remains now a great controversy about the sinking, over whether Lusitania was smuggling contraband war material to England and over the number of torpedoes Schwieger fired.

Before he got back to the docks at Wilhelmshaven for refuelling and resupply, the United States had formally protested to Berlin against the brutality of his action.

Kaiser Wilhelm II wrote in the margins of the American note, "Utterly impertinent", "outrageous", and "this is the most insolent thing in tone and bearing that I have had to read since the Japanese note last August." Nevertheless, to keep America out of the war, in June the Kaiser was compelled to rescind unrestricted submarine warfare and require all passenger liners be left unmolested.

U-20 and her fleetmates in Kiel harbour, 1914

On 4 September 1915 Schwieger was back at sea with U-20, 85 nautical miles (157 km; 98 mi) off the Fastnet Rock in the south Irish Sea. This rock held one of the key navigational markers in the western ocean, the Fastnet Lighthouse, and any ships passing in and out of the Irish Sea would be within visual contact of it.

RMS Hesperian was now beginning a new run outward bound from Liverpool to Quebec and Montreal, with a general cargo, also doubling as a hospital ship, and carrying about 800 passengers. She was attacked off the Fastnet, a landmark islet in the north Atlantic, off the south-west coast of Ireland. The History of the Great War: The Merchant Navy, Vol. II, by Hurd, reads:

"Only a few days before, Count Bernsdorff, the German Ambassador, had assured the United States government that passenger liners will not be sunk without warning and without ensuring the safety of the non combatants aboard providing that the liners do not try to escape or offer resistance."

This time, Schwieger was received with official disgust upon his return to Wilhelmshaven. Ordered to report to Berlin to explain himself, he was required to apologise for having sunk another passenger liner in defiance of a direct order not to do so again. He complained about his treatment in Berlin thereafter.

After his death in 1917, Schwieger was forgiven in Berlin. He received Germany's highest decoration, the Pour le Mérite, having sunk 190,000 tons of shipping.

Fate and legacy

U-20 grounded on the Danish coast in 1916. Torpedoes had been exploded in the bow to destroy the boat

On 4 November 1916, U-20 grounded on the Danish coast south of Vrist, a little north of Thorsminde after suffering damage to its engines. Her crew attempted to destroy her with explosives the following day, succeeding, however, only in damaging the boat's bow (see picture) but making it effectively inoperative as a war ship.^[4] The boat remained on the beach until 1925 when the Danish government blew it up in a "spectacular explosion".^[5] The Danish navy removed the deck gun and made it unserviceable by cutting holes in vital parts. The gun was kept in the naval stores at Holmen in Copenhagen for almost 80 years. The conning tower was removed and placed on the front lawn of the local museum Strandingsmuseum St. George Thorsminde, where it still is today.^[5][6][7]

Novelist Clive Cussler claims his National Underwater and Marine Agency (NUMA) located the remains of U-20 in 1984, about 400 yards from shore.^[8]

Summary of raiding history

Date	Name	Nationality	Tonnage[Note 2]	Fate[9]
30 January 1915	Ikaria	United Kingdom	4,335	Sunk
30 January 1915	Oriole	United Kingdom	1,489	Sunk
30 January 1915	Tokomaru	United Kingdom	6,084	Sunk
7 March 1915	Bengrove	United Kingdom	3,840	Sunk
9 March 1915	Princess Victoria	United Kingdom	1,108	Sunk
11 March 1915	Florazan	United Kingdom	4,658	Sunk
5 May 1915	Earl of Lathom	United Kingdom	132	Sunk
6 May 1915	Candidate	United Kingdom	5,858	Sunk
6 May 1915	Centurion	United Kingdom	5,495	Sunk
7 May 1915	Lusitania	United Kingdom	30,396	Sunk
8 July 1915	Marion Lightbody	Russian Empire	2,176	Sunk
9 July 1915	Ellesmere	United Kingdom	1,170	Sunk
9 July 1915	Leo	Russian Empire	2,224	Sunk
9 July 1915	Meadowfield	United Kingdom	2,750	Sunk
13 July 1915	Lennok	Russian Empire	1,142	Sunk
2 September 1915	Roumanie	United Kingdom	2,599	Sunk
3 September 1915	Frode	Denmark	1,875	Sunk
4 September 1915	Hesperian	United Kingdom	10,920	Sunk
5 September 1915	Dictator	United Kingdom	4,116	Sunk
5 September 1915	Douro	United Kingdom	1,604	Sunk
5 September 1915	Rhea	Russian Empire	1,145	Sunk
6 September 1915	Guatemala	France	5,913	Sunk
7 September 1915	Bordeaux	France	4,604	Sunk
7 September 1915	Caroni	United Kingdom	2,652	Sunk
8 September 1915	Mora	United Kingdom	3,047	Sunk
30 April 1916	Bakio	Spain	1,906	Sunk
1 May 1916	Bernadette	France	486	Sunk
2 May 1916	Ruabon	United Kingdom	2,004	Sunk
3 May 1916	Marie Molinos	France	1,946	Sunk
6 May 1916	Galgate	United Kingdom	2,356	Sunk
8 May 1916	Cymric	United Kingdom	13,370	Sunk
1 August 1916	Aaro	United Kingdom	2,603	Sunk
29 August 1916	Ibo	Portugal	397	Damaged
26 September 1916	Thelma	United Kingdom	1,002	Sunk
18 October 1916	Ethel Duncan	United Kingdom	2,510	Sunk
23 October 1916	Arromanches	France	1,640	Sunk
23 October 1916	Chieri	Kingdom of Italy	4,400	Sunk
23 October 1916	Felix Louis	France	275	Sunk
26 October 1916	Fabian	United Kingdom	2,246	Damaged

See also

• Room 40

References

Notes

Citations

Bibliography

• 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. 
• Spindler, Arno (1966) [1932]. Der Handelskrieg mit U-Booten. 5 Vols. Berlin: Mittler & Sohn. Vols. 4+5, dealing with 1917+18, are very hard to find: Guildhall Library, London, has them all, also Vol. 1-3 in an English translation: The submarine war against commerce. 
• Beesly, Patrick (1982). Room 40: British Naval Intelligence 1914–1918. London: H Hamilton. ISBN 978-0241108642. 
• Halpern, Paul G. (1920). A Naval History of World War I. New York: Routledge. ISBN 978-1857284980. 
• Roessler, Eberhard (1997). Die Unterseeboote der Kaiserlichen Marine. Bonn: Bernard & Graefe. ISBN 978-3763759637. 
• Schroeder, Joachim (2002). Die U-Boote des Kaisers. Bonn: Bernard & Graefe. ISBN 978-3763762354. 
• Koerver, Hans Joachim (2008). Room 40: German Naval Warfare 1914–1918. Vol I., The Fleet in Action. Steinbach: LIS Reinisch. ISBN 978-3-902433-76-3. 
• Koerver, Hans Joachim (2009). Room 40: German Naval Warfare 1914–1918. Vol II., The Fleet in Being. Steinbach: LIS Reinisch. ISBN 978-3-902433-77-0. 

External links

Wikimedia Commons has media related to German Type U 20 submarine.

• U20 at Strandingsmuseum St. George, Thorsminde
• Royal Danish Naval Museum
• Photos of cruises of German submarine U-54 in 1916–1918. Great photo quality, comments in German.
• A 44 min. film from 1917 about a cruise of the German submarine U-35. A German propaganda film without dead or wounded; many details about submarine warfare in World War I.
• Helgason, Guðmundur. "WWI U-boats: U 20". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. 
• Room 40: original documents, photos and maps about World War I German submarine warfare and British Room 40 Intelligence from The National Archives, Kew, Richmond, UK.

Coordinates: 56°35′00″N 08°07′50″E / 56.58333°N 8.13056°E / 56.58333; 8.13056