Tb 99M 29 Oct 1915

17 Mar 1916 in dock for modifications to stern. 27 Mar 1916 supporting air raid on Piave vecchia; towed downed flying boat L107 to Parenzo. 03 May 1916 supporting air raids against Ravenna and Corsini. 23 May 1916 supporting air raid on Venice with Tb 75T, Tb 98M and Tb 100M; unsuccessfully attacked by enemy submarine 15 nm from Malamocco. 24 May 1916 towed Tb 75T to Pola for repair. 12 Jun 1916 pursuing Italian torpedo boats which had raided Parenzo. 22 Jul 1916 mineseeking in the Quarnerolo. 04 Sep 1916 at Cattaro. 04 Oct 1916 in action in Otranto Straits.

04 Mar 1917 from Cattaro to Pola. Under repair until 18 Mar 1917. 26 Apr 1917 to Gjenovic. 15 May 1917 in action with Sankt Georg. 15 Jul 1917 at Pola. 29 Sep 1917 supporting air raid; engaged at length with Italian torpedo boats off Po delta. 17-19 Oct 1917 with German Admiralty to Cattaro and return. 29 Oct 1917 mineseeking between Sistiana and Sdobba estuary. 31 Oct 1917 mineseeking off Grado. 01-08 Nov 1917 mineseeking. 14/15 Nov 1917 under fire from batteries at Cortelazzo. 16 Nov 1917 minesweeping ahead of Wien and Budapest; damaged by fire from Italian batteries. 19 Dec 1917 under fire from batteries at Cortelazzo.

06 Feb 1918 at Gjenovic. 31 May 1918 on reconnaissance in Gulf of Drin. 26 Jul 1918 boiler sustained damage during Allied air raid on Cattaro. 27 Jul 1918 to Pola for repair.

To Greece as Kios; scuttled/sunk by German aircraft off Athens 22/23 Apr 1941.