Etna - class protected cruiser " This article is about the 1880s cruiser class . For the uncompleted World War II cruisers , see Etna class cruiser . " The Etna class protected cruiser s were built in the late 1880s for the Regia Marina ( the Royal Italian Navy ) . The four ships built were slightly enlarged copies of the Elswick Works ' design for the protected cruiser . " Etna " , the lead ship of the class , was the only ship still in service when World War I began , although she became a stationary headquarters ship for the Navy Commander - in - Chief in Taranto for the duration of the war . The three later ships all participated in putting down the Boxer Rebellion as part of the Eight - Nation Alliance . The three were struck from the Navy List before 1912 , but " Etna " was not sold for scrap until 1921 . Design and description . The design of the " Etna " - class protected cruisers was based on that of Sir W G Armstrong Mitchell & Co . ' s Elswick Works ' earlier " Giovanni Bausan " , which was the first modern protected cruiser constructed for the Italian Navy . She proved successful enough that the Italians negotiated for a license to build copies in Italian shipyards . George Rendel and Carlo Vigna designed the ships . The first three ships varied somewhat in their displacement and engine power , and the last ship , " Ettore Fieramosca " , was slightly longer than the others . The " Etna " - class ships measured between perpendiculars , with a beam of . They had a mean draft of and displaced between . They carried a crew of 12 officers and 296 men . " Ettore Fieramosca " was between perpendiculars and had a beam of . She had a draft of and displaced . Her crew consisted of 17 officers and 298 men . Propulsion . The " Etna " - class cruisers had two vertical compound steam engines , each driving a single propeller . Their engines were powered by four double - ended cylindrical boilers . On sea trials the engines produced a total between and the ships reached between . The ships carried between of coal which allowed them to steam for at a speed of . Armament and armor . The main armament of the ships consisted of two Armstrong , 30 - caliber breech - loading guns mounted in barbette s fore and aft . Each gun had an approximate firing arc of 240° . " To load , the gun was laid fore and aft in line with a fixed armored deckhouse into which ammunition was hoisted from below . " They fired a shell at a muzzle velocity of . The six , 32 - caliber , breech - loading guns were carried in sponsons along the sides of the ships in Vavasseur mountings . The guns fired a shell that weighed at a muzzle velocity of . For anti - torpedo boat defense the first three ships mounted five 6 - pounder Hotchkiss guns . Each shell weighed about and could be fired at 20 rounds per minute . Their muzzle velocity of gave them a range of about . Another five 1 - pounder Hotchkiss guns were also carried . They fired a shell weighing about at a muzzle velocity of about to a range of about . They had a rate of fire of about 30 rounds per minute " Etna " , " Stromboli " , and " Vesuvio " were fitted with four torpedo tube s . One was mounted in the bow underwater and the other three were above water . " Ettore Fieramosca " s anti - torpedo boat armament differed slightly from that of her half - sisters . She carried six 6 - pounder and eight 1 - pounder Hotchkiss guns , but only three torpedo tubes . The cruisers were fitted with an armored deck below the waterline with a maximum thickness of and had a belt of cork at their waterline , which was intended to seal holes by swelling through water absorption after being hit . This proved to be unsuccessful as hits would result in the destruction of the cork and it tended to deteriorate quickly . The breech and loading area of the main guns was protected by an armored hood thick . Operational history . " Etna " served in the " Squada Permamente " ( Permanent Squadron ) from her commissioning to 1893 and then served in North and South American waters until the end of 1895 . From April to June 1893 , she participated in the International Naval Review at Hampton Roads that was part of the Columbian Exposition . Afterward she was stationed in the Red Sea during the First Italo - Ethiopian War of 1895 – 6 and then supported Italian interests during the Cretan Revolt of 1898 . The ship was then transferred to the Far East , returning home in 1902 . " Etna " was disarmed that same year and she was flagship of the Superior Torpedo - Boat Command in 1904 . The ship was rebuilt between 1905 and 1907 , her superstructure was enlarged and she was given two guns , one each fore and aft , as well as four 6 - inch guns in her waist , two per side . In 1909 she participated in the Hudson - Fulton Celebration . She served as a training ship after her rebuild until the start of World War I when she became the stationary flagship of the Commander - in - Chief in Taranto for the duration of the war . " Etna " was disarmed again in 1920 and sold for scrap in 1921 . " Stromboli " , " Vesuvio " and " Ettore Fieramosca " participated in the 1893 Naval Maneuvers as part of the Squadron of Maneuvers . " Stomboli " and " Ettore Fieramosca " next participated in the 1896 Naval Maneuvers as part of the Maneuver Fleet . " Stromboli " was sent to the Far East in 1899 while " Vesuvio " and " Ettore Fieramosca " were sent there in 1900 to assist in putting down the Boxer Rebellion . All three ships were assigned to the Cruising Squadron in Chinese waters in 1901 . " Stromboli " returned to Italy in 1901 and was placed in reserve and served as an ammunition ship before being struck from the Navy List in 1907 and sold for scrap in 1911 . After a second posting in the Far East , " Vesuvio " was placed in reserve , struck from the Navy List in 1911 and sold for scrap in 1915 . " Ettore Fieramosca " returned to Italy and made a cruise off East Africa in 1905 . She then sailed across the Atlantic and made a number of port visits in South America . The ship was then assigned to the American Squadron and refitted in Boston in November 1906 . Upon her return to Italy in 1909 " Ettore Fieramosca " was struck off the Navy List in July 1909 and sold .