T4 was a seagoing torpedo boat operated by the Royal Yugoslav Navy between 1921 and 1932, after spending World War I in Austro-Hungarian Navy service. Originally 79 T, she was a 250t-class torpedo boat, and was laid down on 1 December 1913, launched on 30 April 1914 and completed on 30 September of that year. She saw active service during World War I, performing convoy, patrol, escort and minesweeping tasks, anti-submarine operations and shore bombardment missions. Following Austria-Hungary's defeat in 1918, 79 T was allocated to the Navy of the Kingdom of Serbs, Croats and Slovenes, which later became the Royal Yugoslav Navy, and was renamed T4. At the time, she and the seven other 250t-class boats were the only modern sea-going vessels of the fledgling maritime force. During the interwar