In June 1918, in an attempt to earn safer passage for German and Austro-Hungarian U-boats through the Strait of Otranto, the Austro-Hungarian Navy attempted to break the Barrage with a major attack on the strait, but it was abandoned after Szent István was sunk by the Italian motor torpedo boat MAS-15 on the morning of 10 June. Following the Bombardment of Ancona and the commissioning of Szent István, the four ships saw little combat due to the Otranto Barrage which prohibited the Austro-Hungarian Navy from leaving the Adriatic Sea. Īll of the Tegetthoffs were members of the 1st Battleship Division at the beginning of the war and were stationed out of the naval base at Pola. This was too late for her to take part in the Bombardment of Ancona in which the remaining ships in the class saw action immediately following Italy's declaration of war on Austria-Hungary in May 1915. The smaller shipyards in Fiume resulted in a slower construction which was further delayed by the outbreak of the war, with Szent István commissioned into the fleet in December 1915. Viribus Unitis and Tegetthoff were commissioned into the fleet in December 1912 and July 1913, respectively. The SMS Szent István had a different more modern propulsion system than her sister ships. The Tegetthoff-class ships hold the distinction for being the first and only dreadnought battleships of the Austro-Hungarian Navy. Three of the four warships were built in the Stabilimento Tecnico Triestino shipyard in Trieste Szent István was built in the Ganz-Danubius shipyard in Fiume, so that both parts of the Dual Monarchy would participate in the construction of the ships. Construction started on the ships shortly before World War I Viribus Unitis and Tegetthoff were both laid down in 1910, Prinz Eugen and Szent István followed in 1912. Named for Austrian Admiral Wilhelm von Tegetthoff, the class was composed of SMS Viribus Unitis, SMS Tegetthoff, SMS Prinz Eugen, and SMS Szent István. The Tegetthoff class (also called the Viribus Unitis class ) was a class of four dreadnought battleships built for the Austro-Hungarian Navy. State of Slovenes, Croats and Serbs Navy.Stabilimento Tecnico Triestino, Trieste.Viribus Unitis, the lead ship of the Tegetthoff-class battleships, in 1912

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