|Ordered:||2 February 1913|
|Laid down:||7 February 1914, as U-10 (Austria-Hungary)|
|Launched:||24 June 1915|
|Commissioned:||4 September 1915|
|Fate:||disappeared after 11 July 1917|
|General characteristics |
|Class and type:||German Type U 66 submarine|
|Height:||7.95 m (26 ft 1 in)|
|Draft:||3.79 m (12 ft 5 in)|
|Test depth:||50 m (160 ft)|
|Complement:||4 officers, 32 enlisted men|
SM U-69 was a Type U 66 submarine or U-boat for the German Imperial Navy (German: Kaiserliche Marine) during the First World War. She had been laid down in February 1914 as U-10 the fourth boat of the U-7 class for the Austro-Hungarian Navy (German: Kaiserliche und Königliche Kriegsmarine or K.u.K. Kriegsmarine) but was sold to Germany, along with the others in her class, in November 1914.
The submarine was ordered as U-10 from Germaniawerft of Kiel as the first of five boats of the U-7 class for the Austro-Hungarian Navy. After the outbreak of World War I in August 1914, the Austro-Hungarian Navy became convinced that none of the submarines of the class could be delivered to the Adriatic via Gibraltar. As a consequence, the entire class, including U-10, was sold to the German Imperial Navy in November 1914. Under German control, the class became known as the U 66 type and the boats were renumbered; U-10 became U-69, and all were redesigned and reconstructed to German specifications. U-69 was launched in June 1915 and commissioned in September. As completed, she displaced 791 tonnes (779 long tons), surfaced, and 933 tonnes (918 long tons), submerged. The boat was 69.50 metres (228 ft) long and was armed with five torpedo tubes and a deck gun.
As a part of the 4th Flotilla, U-69 sank 31 ships with a combined gross register tonnage of 102,875 in five war patrols. U-69 left Emden on her sixth patrol on 9 July 1917 for operations off Ireland. On 11 July, U-69 reported her position off Norway but neither she nor any of her crew were ever heard from again. British records say that U-69 was sunk by destroyer HMS Patriot on 12 July, but a German postwar study cast doubt on this. U-69's fate is officially unknown.
Design and construction
After the Austro-Hungarian Navy had competitively evaluated three foreign submarine designs, it selected the Germaniawerft 506d design, also known as the Type UD, for its new U-7 class of five submarines. The Navy ordered five boats on 1 February 1913.
The U-7 class was seen by the Austro-Hungarian Navy as an improved version of its U-3 class, which was also a Germaniawerft design.[Note 1] As designed for the Austro-Hungarian Navy, the boats were to displace 695 tonnes (684 long tons) on the surface and 885 tonnes (871 long tons) while submerged. The doubled-hulled boats were to be 69.50 metres (228 ft) long overall with a beam of 6.30 metres (20.7 ft) and a draft of 3.79 metres (12.4 ft). The Austrian specifications called for two shafts with twin diesel engines (2,300 metric horsepower (2,269 bhp; 1,692 kW) total) for surface running at up to 17 knots (31 km/h; 20 mph), and twin electric motors (1,240 PS (1,223 shp; 912 kW) total) for a maximum of 11 knots (20 km/h; 13 mph) when submerged. The boats were designed with five 45 cm (17.7 in) torpedo tubes; four located in the bow, one in the stern. The boats' armament was to also include a single 6.6 cm (2.6 in) deck gun.
Neither U-10 nor any of her sister boats were complete when World War I began in August 1914. With the boats under construction at Kiel, the Austrians became convinced that it would be impossible to take delivery of the boats, which would need to be towed into the Mediterranean past Gibraltar, a British territory.[Note 2] As a result, U-10 and her four sisters were sold to the Imperial German Navy on 28 November 1914.[Note 3]
U-10 was renumbered by the Germans as U-69 when her class was redesignated as the Type U 66. The Imperial German Navy had the submarines redesigned and reconstructed to German standards, which increased the surface displacement by 96 tonnes (94 long tons) and the submerged by 48 tonnes (47 long tons). The torpedo load was increased by a third, from 9 to 12, and the deck gun was upgraded from the 6.6 cm (2.6 in) gun originally specified to an 8.8 cm (3.5 in) one.
U-69 was launched on 24 June 1915. On 4 September, SM U-69 was commissioned into the Imperial German Navy under the command of Kapitänleutnant Ernst Wilhelms. On 4 March 1916, U-69 was assigned to the IV. U-Halbflotille.
U-69 successfully completed five war patrols in which she sank 31 ships with a combined a total of 102,875 gross register tons (GRT). U-69's most successful month for number of ships sunk was April 1916, when she sank eight ships of 21,051 tons in a span of six days. The month with the highest tonnage sunk was June 1917 when she sank five ships of 28,808 tons in a nine-day span; nearly half of that total came from one ship, the 13,441-ton British armed merchant cruiser Avenger sunk on 14 June. Avenger had been patrolling off the Shetland Islands and was returning to Scapa Flow, when she was struck by a single torpedo on the port side. The ship began listing heavily and non-essential crew were evacuated while destroyers arrived and took her under tow. Despite strenuous efforts to save her, Avenger foundered ten hours after being hit when her internal bulkheads collapsed. One man was killed in the attack.
U-69 began her sixth and final patrol on 9 July when she departed from Emden, destined for operations off Ireland. U-69's position report at 02:30 on 11 July reported that she was 35 nautical miles (65 km; 40 mi) south of Lindesnes, Norway, and was the last known contact with U-69. According to author Dwight Messimer, two British sources report that HMS Patriot sank U-69 at position on 12 July. An observer in a kite balloon deployed by Patriot spotted a surfaced U-boat at 07:00. The U-boat submerged and Patriot hunted the submarine until noon, when it loosed two depth charges that brought thick brown oil to the surface. A postwar study by Germany cast doubt on whether or not the submarine attacked by Patriot was U-69. Officially, her fate remains unknown.
Summary of raiding history
|15 April 1916||Fairport||United Kingdom||3,838||Sunk|
|15 April 1916||Schwanden||Russian Empire||844||Sunk|
|16 April 1916||Glendoon||Norway||1,918||Sunk|
|16 April 1916||Harrovian||United Kingdom||4,309||Sunk|
|16 April 1916||Papelera||Norway||1,591||Sunk|
|17 April 1916||Ernest Reyer||France||2,708||Sunk|
|18 April 1916||Ravenhill||United Kingdom||1,826||Sunk|
|20 April 1916||Cairngowan||United Kingdom||4,017||Sunk|
|11 July 1916||HMT Era||Royal Navy||168||Sunk|
|20 October 1916||Cabotia||United Kingdom||4,309||Sunk|
|24 October 1916||Sola||Norway||3,057||Sunk|
|26 October 1916||North Wales||United Kingdom||4,072||Sunk|
|26 October 1916||Rappahannock||United Kingdom||3,871||Sunk|
|2 November 1916||Spero||United Kingdom||1,132||Sunk|
|3 November 1916||Bertha||Sweden||591||Sunk|
|20 April 1917||Annapolis||United Kingdom||4,567||Sunk|
|25 April 1917||Hesperides||United Kingdom||3,393||Sunk|
|26 April 1917||Rio Lages||United Kingdom||3,591||Sunk|
|26 April 1917||Vauxhall||United Kingdom||3,629||Sunk|
|1 May 1917||Rockingham||United States||4,555||Sunk|
|2 May 1917||Troilus||United Kingdom||7,625||Sunk|
|29 May 1917||Argo||Sweden||123||Sunk|
|29 May 1917||Ines||Sweden||261||Sunk|
|29 May 1917||Consul N. Nielsen||Denmark||1,395||Sunk|
|31 May 1917||Esneh||United Kingdom||3,247||Sunk|
|3 June 1917||Luisa||Kingdom of Italy||1,648||Damaged|
|6 June 1917||Parthenia||United Kingdom||5,160||Sunk|
|8 June 1917||Enidwen||United Kingdom||3,594||Sunk|
|8 June 1917||Saragossa||United Kingdom||3,541||Sunk|
|13 June 1917||Kelvinbank||United Kingdom||4,072||Sunk|
|14 June 1917||Avenger||Royal Navy||13,441||Sunk|
|24 July 1917||Mikelis||Greece||2,430||Sunk|
- The U-3-class submarines, however, were less than half the displacement and nearly 90 feet (27 m) shorter than the U-7 design. See: Gardiner, pp. 342–43.
- The Austro-Hungarian Navy's Germaniawerft-built U-3 class boats had been towed from Kiel to Pola via Gibraltar in 1909. See: Sieche, p. 19.
- In April 1915, just five months later, the German U-21 successfully entered the Mediterranean through the Straits of Gibraltar, proving that delivery would have been possible after all. See: Gardiner, p. 343.
- Gardiner, p. 177.
- Helgason, Guðmundur. "WWI U-boats: U 69". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 December 2008.
- Gröner 1991, p. 10.
- Helgason, Guðmundur. "WWI U-boat commanders: Ernst Wilhelms (Royal House of Hohenzollern)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 13 January 2015.
- Gardiner, p. 340.
- Gardiner, p. 343.
- Guðmundur Helgason. WWI U-boats: U 66, WWI U-boats: U 67, WWI U-boats: U 68, WWI U-boats: U 69, WWI U-boats: U 70. U-Boat War in World War I. Uboat.net. Retrieved on 9 December 2008.
- Tarrant, p. 34.
- Helgason, Guðmundur. "Ships hit by U 69". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 December 2008.
- Helgason, Guðmundur. "Ships hit during WWI: Avenger". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 9 December 2008.
- Hepper, p. 93.
- Messimer, p. 88.
- Gardiner, Robert, ed. (1985). Conway's All the World's Fighting Ships, 1906–1921. Annapolis, Maryland: Naval Institute Press. ISBN 978-0-87021-907-8. OCLC 12119866.
- 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.
- Hepper, David (2006). British Warship Losses in the Ironclad Era 1860–1919. London: Chatham Publishing. ISBN 978-1-86176-273-3. OCLC 237129318.
- Messimer, Dwight R. (2002). Verschollen: World War I U-boat losses. Annapolis, Maryland: Naval Institute Press. ISBN 978-1-55750-475-3. OCLC 231973419.
- Sieche, Erwin F. (1980). "Austro-Hungarian Submarines". Warship, Volume 2. Naval Institute Press. ISBN 978-0-87021-976-4. OCLC 233144055.
- Tarrant, V. E. (1989). The U-Boat Offensive: 1914–1945. Annapolis, Maryland: Naval Institute Press. ISBN 978-0-87021-764-7. OCLC 20338385.
- Spindler, Arno (1966) . 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 978-0-241-10864-2.
- Halpern, Paul G. (1995). A Naval History of World War I. New York: Routledge. ISBN 978-1-85728-498-0.
- Roessler, Eberhard (1997). Die Unterseeboote der Kaiserlichen Marine. Bonn: Bernard & Graefe. ISBN 978-3-7637-5963-7.
- Schroeder, Joachim (2002). Die U-Boote des Kaisers. Bonn: Bernard & Graefe. ISBN 978-3-7637-6235-4.
- 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.
- Helgason, Guðmundur. "WWI U-boats: U 69". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net.
- Photos of cruises of German submarine U-54 in 1916-1918.
- A 44 min. German film from 1917 about a cruise of the German submarine U-35.
- 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.