SM U-6 was one of 329 U-boatss which served in the Imperial German Navy during World War I. The boat was built at Germaniawerft in Kiel between 1908 and 1910, as the second Type U 5 submarine. She was launched on 18 May 1910 and commissioned into the Navy on 12 August. During the war she sank 16 merchant ships and took three as prizes with a combined loss of 11,951 Gross Register Tons. The boat was torpedoed and sunk by British submarine off Stavanger, Norway on 15 September 1915.

War service At the outbreak of World War I, U-6 was initially commanded by Oberleutnant zur See Wilhelm-Friedrich Starke and formed part of I U-boat Flotilla. Command passed to Oberleutnant zur See Otto Steinbrinck towards the end of 1914 before the boat was taken over by Oberleutnant zur See Reinhold Lepsius. Steinbrinck briefly took command again in January 1915, before Lepsius took over for the rest of the boat's career.

On 25 February 1915 U-6 left Germany for operations in the English Channel. She reached Cap Gris Nez on 27 February, and on 28 February was preparing to carry out an attack on the British steamer Thordis off Beachy Head, when the submarine's periscope was spotted. The merchant ship rammed U-6, damaging the boat's periscope. This forced U-6 to abandon her patrol and return to base.

U-6 operated in the North Sea between 7 and 20 April 1915. Based at Heligoland, she left for the British east coast. On 11 April she launched two torpedo attacks against a steamer off Aberdeen; both attacks failed. For the next three days U-6 observed shipping in the area until she successfully attacked and sank two steamers on 14 April. On 18 April she took the British trawler Glencarse (188 tons) as a prize and headed back to base, arriving at Heligoland on 21 April 1915.

Leaving Heligoland again on 17 July 1915, two days later U-6 sank the 422 ton Swedish sailing ship Capella which was carrying timber to Britain. On 21 July she sank two Swedish steamers and took the Norwegian steamer Anvers as a prize. Three Norwegian sailing ships were burned on 25 July and after a brief brush with a Q ship the next day, a Swedish steamer and three Danish sailing ships were burned. Running low on fuel, U-6 returned to base on 29 July, reaching Heligoland the next day.

On 9 September 1915 U-6 sailed for what would be her final patrol. She burned two Norwegian sailing ships carrying timber to Britain and on 11 September took the Norwegian steamer Randulf Hansen as a prize. She sank the three-masted auxiliary sailing ship Bien on the next day and on 13 September the Norwegian coaster Norte was searched and sunk off Kristiansand. On 14 September U-6 met with .

Fate In the afternoon on 15 September 1915, U-6 was attacked by the British submarine with two torpedoes. Evasive manoeuvres were only partly successful and whilst the first torpedo missed, the second struck U-6 in front of the conning tower, sinking her instantly at . Except for five men on the conning tower all of the boat's crew died. The boat's Officer of the Watch, Oberleutnant zur See Beyer, believed that the smoke from U-6s paraffin engines had made the commander of E16 aware of her presence and enabled him to manoeuvre in to firing position.

Summary of raiding history U-6 sank 16 merchant ships with a total of 9,614 GRT. She also took three ships, with a total of 2,337 GRT, as prizes under the cruiser rules. The total tonnage taken by U-6 was 11,951 GRT.

DateShip NameNationalityTonnage (GRT)Fate14 April 1915Folke1,352Sunk14 April 1915Glencarse188Captured as prize14 April 1915Vestland3,392Sunk19 July 1915Capella422Sunk21 July 1915Anvers862Captured as prize21 July 1915Madonna455Sunk22 July 1915Fortuna203Sunk25 July 1915G. P. Harbitz673Sunk25 July 1915Harboe388Sunk25 July 1915Sognedalen644Sunk26 July 1915Elna78Sunk26 July 1915Emma687Sunk26 July 1915Marie173Sunk26 July 1915Neptunus143Sunk10 September 1915Presto206Sunk11 September 1915Wansbeck462Sunk11 September 1915Randulf Hansen1,287Captured as prize12 September 1915Bien120Sunk13 September 1915Norte216Sunk

References

Bibliography

Spindler, Handelskrieg, Vol.II, pp. 75, 133-4, 246–7