at a speed of . Viribus Unitis mounted twelve Škoda 30.5 cm K10 guns in four triple turrets. Her secondary armament consisted of a dozen Škoda 15 cm K10 guns mounted in casemates amidships. Twelve Škoda K10 guns were mounted on open pivot mounts on the upper deck, above the casemates. Three more 7 cm K10 guns were mounted on the upper turrets for anti-aircraft duties. Four submerged torpedo tubes were fitted, one each in the bow, stern and on each broadside; twelve torpedoes were carried. Service history Archduke Franz Ferdinand's visit to Sarajevo Archduke Franz Ferdinand of Austria travelled aboard Viribus Unitis in late June 1914 en route to Bosnia to observe military manoeuvres. On 25 June, he boarded the ship in Trieste Harbour and travelled to the mouth of the Neretva River, where he transferred to another vessel. On 30 June, two days after Ferdinand and his wife were assassinated by Gavrilo Princip in the Bosnian city of Sarajevo, Viribus Unitis transported their bodies back to Trieste. World War I Prior to the war, Viribus Unitis was assigned to the 1st Battleship Division of Austro-Hungarian Navy. During World War I, the battleship saw limited service due to the Otranto Barrage which prohibited Austro-Hungarian battleships from leaving the Adriatic sea. As a result, she hardly ever left Pola. Viribus Unitis, along with her sister ships , and the remainder of the Austro-Hungarian Navy, was mobilized on the eve of World War I to support the flight of and . The two German ships were stationed in the Mediterranean and were attempting to break out of the strait of Messina, which was surrounded by enemy troops and vessels and make their way to Turkey. After the Germans successfully broke out of Messina, the navy was recalled. The fleet had by that time advanced as far south as Brindisi in south eastern Italy. Viribus Unitis also participated in the bombardment of the Italian city of Ancona in May 1915. Following these operations Viribus Unitis remained in Pola for most of the remainder of the war. Her tenure in Pola was livened up by a visit from the new Emperor Charles I on 15 December 1916 and another by Kaiser Wilhelm II on 12 December 1917 during his inspection of the German submarine base there. The Italians conducted eighty air raids on Pola between 1915 and 1917. The Otranto Raid By 1918,