No. 22 ran aground and sank off Sebenico on 3 March 1916, but was salvaged and repaired later that year. All of the remaining torpedo boats were converted to minesweepers during 1917. The boats of the class all retained their torpedo tubes, but only Nos. 19 and 21–24 still carried torpedoes. On 16 November 1917, Nos. 23, 27 and 30 were part of a minesweeping force that supported the bombardment of a Italian shore battery at Cortellazzo near the mouth of the Piave near Venice, supported by three seaplanes. None of the torpedo boats suffered any damage. After an Italian force of three MAS boats appeared, covered by seven destroyers and three submarines, the bombarding force withdrew. On 19 December, a large Austro-Hungarian force again engaged the Italian shore battery at Cortellazzo. The force was supported by Nos. 20, 23, 27, 30, 32 and 34. None of the ships of the bombarding force suffered damage during the mission. On 5 April 1918, the Huszár-class destroyer and No. 26 put a landing party ashore at Anconaon the central Italian coastbut the party was captured. On 5 September, Nos. 19 and 38 were supporting another torpedo boat in the Gulf of Drinoff the Albanian coastwhen they encountered an Italian force. The Austro-Hungarian boats broke off contact and escaped.
