Yugoslav torpedo boat T7

During World War I, 96 F was used for convoy, patrol, escort and minesweeping tasks, and anti-submarine operations.[1] In 1917, one of the 66 mm (2.6 in) guns on each boat of the class was placed on an anti-aircraft mount.[2] On the night of 11 May 1917, the Huszár-class destroyer Csikós, accompanied by 96 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 96 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.[7]

96 F 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, she was allocated to the Kingdom of Serbs, Croats and Slovenes (KSCS, later Yugoslavia). Along with three other 250t-class F-group boats, 87 F, 93 F and 97 F, and four 250t-class T-group boats, she was transferred in March 1921 to the Navy of the KSCS, which later became the Royal Yugoslav Navy (Serbo-Croatian Latin: Kraljevska Jugoslovenska Ratna Mornarica, KJRM).[8] Renamed T7 in KJRM service,[2] she and the other seven 250t-class boats were, at the outset, the only modern sea-going vessels in the KJRM.[9] In 1925, exercises were conducted off the Dalmatian coast, involving the majority of the navy.[10] 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 T7 was one of the torpedo boats involved. The ships and crews made a very good impression while visiting Malta.[11] In 1932, the British naval attaché reported that Yugoslav ships engaged in few exercises, manoeuvres or gunnery training due to reduced budgets.[12]

Murter

Map of the Independent State of Croatia showing the location of Murter Island

In April 1941, Yugoslavia entered World War II when it was invaded by the German-led Axis powers. At the time of the invasion, T7 was assigned as the flagship of the 3rd Torpedo Division located at Šibenik, which included her three F-group sisters.[13] 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 (Zadar) on the Dalmatia 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.[14] 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.[15] All four F-group boats, including T7, were captured by the Italians.[16]

T7 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,[17] but no other significant alterations were made to her.[18] The Italians capitulated in September 1943, and once under German control, T7 was handed over to the Navy of the Independent State of Croatia, serving under her Yugoslav designation. Her crew came under the influence of the Yugoslav Partisans, and were preparing to mutiny when the Germans intervened.[1][19] On 24 June 1944, she and the German S-boats S 154 and S 157 of the 7th S-Boat Flotilla were sailing between Šibenik and Rijeka, protecting German sea supply routes along the Adriatic, when they were attacked by the Royal Navy Fairmile D motor torpedo boats MTB 659, MTB 662 and MTB 670 near the island of Kukuljari, south of Murter Island.[20] Considering T7 one of the few significant threats to British vessels in the region, the British commander ordered MTB 670 to launch a torpedo attack. The two torpedoes missed, so the MTBs pursued and approached the ship from abaft the beam. T7 opened fire at 150 yards (140 m). The MTBs returned fire with their forward and port guns, and within 30 seconds they had disabled T7's weapons and set her ablaze. At a speed of about 12 knots (22 km/h; 14 mph), T7 suddenly veered starboard, narrowly avoiding a collision with MTB 662 (it is not known whether her steering was damaged or if her crew was attempting to perform a ram) before running aground on Murter Island.[21] The MTBs rescued 21 crew.[20] The British crews later examined the wreck, capturing five more sailors and leaving her flooded and burning. A British Army demolition team destroyed the hulk to ensure it could not be salvaged.[21]