Orjen 11 Aug 1914

1914 From 16 Sep on Sebenico station. 02 Nov reconnaissance off Lissa. 09-24 Dec in dock at Pola for modifications, then return to Sebenico station.

1915 On Sebenico station. 18 Feb attack in Strait of Otranto. 18 Mar at Sebenico. 10 Apr in action with Helgoland South of San Maria di Leuca. 23/24 May securing Pelagosa-Cape Gargano route during attack on Italian coast. 27/28 Jul landing duties at Pelagosa. 16 Aug shelled Pelagosa. 22 Nov from Sebenico to attack in Strait of Otranto; rescued crew of steamship Palatino. 15 Dec at Pola.

1916 02 Jan sea trials. 03 Jan to Cattaro. 27 Jan in collision with Csepel. 29 Jan - 16 Feb under repair at Pola. 19 Feb to Gjenovic. 23/24 and 26/27 Feb attacks in Strait of Otranto. 23 and 26/27 Mar unsuccessful search for U24. 02 Apr unsuccessfully torpedoed by enemy submarine. 31 May/01 Jun attack in Strait of Otranto with Balaton, Tb 77T, Tb 79T and Tb 81T; sunk one drifter by torpedo. 03/04 Jul attack in Strait of Otranto. 01-22 Oct repair at Pola. 24 Oct at Gjenovic; on escort duties until end of year. 12 Dec at Castelnuovo.

1917 11/12 Mar unsuccessful action against enemy transport. 30 Mar at Pola for repairs and modification. 14 May sea trials. 17 May at Gjenovic. 07 Jun air support duties. 11 Aug air support duties; unsuccessful search for flying boat K222. 20 Sep attack in Strait of Otranto. 05 Nov, 29 Nov, 05 Dec and 20 Dec aircraft support duties.

1918 On Gjenovic station. ½ Feb involved in Cattaro Mutiny. Feb/Mar escort duties. 06 Apr strafing Italian coast as far as Pescara with Novara. 07 Apr at Pola. 10 Jun in the Bocche for planned attack in Strait of Cattaro. 17/18 Jul attacked by enemy aircraft. 02 Oct at Cattaro. 07 Oct minelaying off Durazzo. 13 Oct protecting damaged hospital ship Oceania. 18 convoy assignments; 7 air support sorties.

At Pola at end of War. To Italy as Pola. From 1922 based at Venice. Visits to Libya, Constantinople and Levant. 1924 taken out of service at Taranto. In reserve from Mar 1928, then Colonial Service in Libya. 1929 based in Venice again. From 1930 in Colonial Service at Tripoli. Renamed Zenson (II) 9 Apr 1931. 1931/2 cruises in Aegean, then to Venice. Paid off 01 May 1937.