Yugoslav torpedo boat T6

During World War I, 93 F was used for convoy, patrol, escort and minesweeping tasks, and anti-submarine operations.[1] On 3 May 1916, 93 F and five other 250-class torpedo boats were accompanying four destroyers when they were involved in a surface action off Porto Corsini against an Italian force led by the flotilla leaders Cesare Rossarol and Guglielmo Pepe. On this occasion the Austro-Hungarian force retreated behind a minefield with no damage to the torpedo boats, and only splinter damage to one of the destroyers.[7] In 1917, one of her 66 mm guns was placed on an anti-aircraft mount.[2] On the night of 11/12 May 1917, the Huszár-class destroyer Csikós, along with 93 F and two other 250t-class boats, were pursued in the northern Adriatic by an Italian force of five destroyers, but were able to retire to safety behind a minefield. On 3 June, the destroyers Wildfang and Csikós, along with 93 F and another 250t-class boat, had a brief encounter with three Italian MAS boats off the mouth of the Tagliamento River in the far north of the Adriatic.[8] The boat survived the war intact.[1]

In 1920, under the terms of the previous year's Treaty of Saint-Germain-en-Laye by which rump Austria officially ended World War I, 93 F was allocated to the Kingdom of Serbs, Croats and Slovenes (KSCS, later Yugoslavia). Along with three other 250t-class F-group boats, 87 F, 96 F and 97 F, and four 250t-class T-group boats, she served with the Royal Yugoslav Navy (Serbo-Croatian Latin: Kraljevska Jugoslovenska Ratna Mornarica, KJRM; Serbo-Croatian Cyrillic: Краљевска Југословенска Ратна Морнарица). Taken over in March 1921,[9] in KJRM service, 93 F was renamed T6.[2] When the navy was formed, she and the other seven 250t-class boats were the only modern sea-going vessels in the KJRM.[10] In 1925, exercises were conducted off the Dalmatian coast, involving the majority of the navy.[11] In May–June 1929, six of the eight 250t-class torpedo boats accompanied the light cruiser Dalmacija, the submarine tender Hvar and the submarines Hrabri and Nebojša, on a cruise to Malta, the Greek island of Corfu in the Ionian Sea, and Bizerte in the French protectorate of Tunisia. It is not clear if T6 was one of the torpedo boats involved. The ships and crews made a very good impression on the British while visiting Malta.[12] In 1932, the British naval attaché reported that Yugoslav ships engaged in few exercises, manoeuvres or gunnery training due to reduced budgets.[13]

In April 1941, Yugoslavia entered World War II when it was invaded by the German-led Axis powers. At the time of the invasion, T6 was assigned to the 3rd Torpedo Division located at Šibenik, which included her three former F-group sisters.[14] On 8 April, the four boats of the 3rd Torpedo Division, along with other vessels, were tasked to support an attack on the Italian enclave of Zara on the Dalmatian coast. They were subjected to three Italian air attacks and, after the last one, sailed from the area of Zaton into Lake Prokljan, where they remained until 11 April.[15] On 12 April, the 3rd Torpedo Division arrived at Milna on the island of Brač, and refused to follow orders to sail to the Bay of Kotor.[16] All four F-group boats were then captured by the Italians.[17]

T6 was then operated by the Italians under her Yugoslav designation, conducting coastal and second-line escort duties in the Adriatic. Her guns were replaced by two 76 mm (3 in) L/40 anti-aircraft guns,[18] but no other significant alterations were made to her.[19] After the Italians capitulated in September 1943, in order to avoid her falling into German hands T6 was scuttled by her crew 30 km (19 mi) north of Rimini on 11 September as she had insufficient fuel on board to reach an Allied port.[20]