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During World War I, 87 F was used for convoy, patrol, escort and minesweeping tasks, anti-submarine operations,[1] and shore bombardment missions.[4][6] On 3 February 1916, 87 F and two other 250t-class boats were involved in a shore bombardment operation against Ortona and San Vito Chietino, led by the armoured cruiser Sankt Georg.[6] Three days later, the scout cruiserHelgoland, 87 F and five other 250t-class boats were intercepted by the British light cruiser HMS Weymouth and French destroyerBouclier north of Durazzo in Albania, during which the only damage was caused by a collision between two of the other 250t-class boats. On 9 July, the scout cruiser Novara led a force which included 87 F and two Kaiman-class torpedo boats in a raid on the Otranto Barrage, the Allied naval blockade of the Strait of Otranto, which resulted in the sinking of two drifters.[7] On 4 November, three Italian destroyers and three torpedo boats were involved in a brief encounter in the northern Adriatic with two Austro-Hungarian destroyers accompanied by 87 F and two other 250t-class boats. The following day, the same three torpedo boats conducted a shore bombardment of Sant'Elpidio a Mare.[8] In 1917, one of her 66 mm guns was placed on an anti-aircraft mount.[2] On 28 November 1917, a number of 250t-class boats were involved in two shore bombardment missions. In the second mission, 87 F joined seven other 250t-class boats and six destroyers for the bombardment of Porto Corsini, Marotta and Cesenatico.[9]
By 1918, the Allies had strengthened their ongoing blockade on the Strait of Otranto, as foreseen by the Austro-Hungarian Navy. As a result, it was becoming more difficult for the German and Austro-Hungarian U-boats to get through the strait and into the Mediterranean Sea. In response to these blockades, the new commander of the Austro-Hungarian Navy, Konteradmiral Miklós Horthy, decided to launch an attack on the Allied defenders with battleships, scout cruisers, and destroyers.[10]During the night of 8 June, Horthy left the naval base of Pola in the upper Adriatic with the dreadnought battleships Viribus Unitis and Prinz Eugen. At about 23:00 on 9 June 1918, after some difficulties getting the harbour defence barrage opened, the dreadnoughts Szent István and Tegetthoff,[11] escorted by one destroyer and six torpedo boats, including 87 F, also departed Pola and set course for Slano, north of Ragusa, to rendezvous with Horthy in preparation for a coordinated attack on the Otranto Barrage. About 03:15 on 10 June,[b] while returning from an uneventful patrol off the Dalmatian coast, two Royal Italian Navy (Italian: Regia Marina) MAS boats, MAS 15 and MAS 21, spotted the smoke from the Austrian ships. Both boats successfully penetrated the escort screen and split to engage the dreadnoughts individually. MAS 21 attacked Tegetthoff, but her torpedoes missed.[13] Under the command of Luigi Rizzo, MAS 15 fired two torpedoes at 03:25, both of which hit Szent István. Both boats evaded pursuit. The torpedo hits on Szent István were abreast her boiler rooms, which flooded, knocking out power to the pumps. Szent István capsized less than three hours after being torpedoed.[12] In October 1918, 87 F was at Durazzo in Albania when the port was bombarded by a multinational Allied naval force. She escaped with minor damage, in what was the last major action involving the Austro-Hungarian Navy.[
