Postcard depicting U-20 sinking RMS Lusitania.
|Ordered:||25 November 1910|
|Builder:||Kaiserliche Werft Danzig|
|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.|
|Class and type:||German Type U 19 submarine|
|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)|
|Test depth:||50 m (164 ft 1 in)|
|Boats & landing |
|Complement:||4 officers, 31 men|
|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.
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 the British Isles 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 coal dust, a boiler explosion, or a explosion in the propulsion system - 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:
There was at the time a great controversy about the sinking, over whether Lusitania was smuggling contraband war material to England and over the number of torpedoes Schwieger fired. The Allies and the United States originally thought the U-20 fired two torpedoes. Postwar investigations showed only one was 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.
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:
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.
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. The boat remained on the beach until 1925 when the Danish government blew it up in a "spectacular explosion". 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.
|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|
<ref>specs for U20 listed in the U.boat Archive web site