abstract
| - U-65. Kaptlt. von Fiachal. On completion at Kiel did trials at Kiel School about May and June 1916, afterwards proceeding to the North Sea to join 4th Flotilla.
* ? 11–14 July 1916. North Sea patrol.
* 16–24 July 1916. North Sea patrol.
* 17–21 August 1916. North Sea patrol, attacked minesweeper Haldon 20 August.
* 3–4 September 1916. North Sea patrol. Returned with defects.
* 26 October - 19 November 1916. To Mediterranean, northabout. Engaged by armed yacht Valiant II in 35°55'N., 3°57'W. Sank nothing. On arrival at Cattaro joined the Pola-Cattaro Flotilla.
* 28 November – 7 December 1916. Left Cattaro and on 1 December probably sank a steamer. On 4 December sank British SS Caledonia in 35°40'N., 17°4'E. The submarine was badly rammed by Caledonia and appears to have returned home immediately on the surface.
* 29 March - 19/20 April 1917. In western Mediterranean sank 4 S.S., 5 sailing vessels (13,000 tons).
* 14 May - 9 June 1917. Possible cruise of U-65. After leaving Cattaro submarine damaged cruiser Dartmouth by torpedo on 15 May in 41°11'N., 18°15'E. She then sank 7 steamers and 12 sailing vessels in the central Mediterranean. 6 June, she was reported off Cape Passaro, 7 June in the vicinity of Straits of Messina, and 8 June was possibly attacked by seaplane in 39°4'N., 19°E.
* The next cruise of U-65 which can be reconstructed with probability was from 10 January to 31 January or 1 February 1918. On this cruise she sank 2 steamers and 1 sailing vessel, and was twice attacked from the air and once by depth-charged by Campanula, which she missed by torpedo.
* A later possible cruise was for about the first 3 weeks of September 1918, on which she sank 4 steamers and damaged 4 more, between longitudes 8° and 17°E.
* At the end of October 1918 she was scuttled by the Germans at Pola or Cattaro.
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