U15
12 Sep 1915Arrived at Pola by rail 21 Aug 1915.
On patrol off Durazzo 29 Dec 1916. 23 Jun 1916 torpedoed and sank French destroyer Fourche and Italian auxiliary cruiser Città di Messina 20 nm east of Otranto. 24 Jun 1916 taken in tow by Tb 53T off Point Remo; brought into port by Tatra.
To Italy; b/u at Pola 1920.