A scout cruiser was a type of warship of the early 20th century, which were smaller, faster, more lightly armed and armoured than protected cruisers or light cruisers, but larger than contemporary destroyers. Intended for fleet scouting duties and acting as a flotilla leader, a scout cruiser was typically armed with six to ten destroyer-type guns of 3-inch (76 mm) to 4.7-inch (120 mm) calibre, plus two to four torpedo tubes.
The British were the first to operate scout cruisers, when the Royal Navy acquired 15 ships divided into two distinct groups - the eight vessels all ordered under the 1903 Programme, and the seven later, heavier-armed vessels ordered under the 1907–1910 Programmes. All these ships served in World War I, when the advent of better machinery and larger, faster destroyers and light cruisers had already made them obsolete.
The other major operator of scout cruisers was the Kingdom of Italy. With no conventional protected cruisers or light cruisers planned between 1900 and 1928, the Italian Royal Navy (Italian: Regia Marina) instead operated a number of scout cruisers (esploratori) from 1912 onwards. Ranging in size from enlarged destroyers to substantial, light cruiser-like ships, these esploratori were also given secondary capabilities as fast minelayers. Later esploratori, such as the Leone class, carried extremely heavy armament for their modest size, capable of outgunning any destroyer of the early 1920s. However, by 1938 the surviving esploratori were re-rated as destroyers.
Spähkreuzer – Translates to 'scout cruiser' in English; developed from late 1930s Zerstörer 1938A/Ac large ocean-going destroyer design concept intended for oceanic escort.
Chester class – later re-classified as light cruisers (CL)
The first three Omaha-class ships were also designated "scout cruisers" (CS) when ordered, but in 1920, before any were launched, the Navy revised its classification system and they - and the Chesters - became light cruisers (CL).
In naval terminology, a destroyer is a fast, maneuverable, long-endurance warship intended to escort larger vessels in a fleet, convoy, or carrier battle group and defend them against a wide range of general threats. They were originally conceived in 1885 by Fernando Villaamil for the Spanish Navy as a defense against torpedo boats, and by the time of the Russo-Japanese War in 1904, these "torpedo boat destroyers" (TBDs) were "large, swift, and powerfully armed torpedo boats designed to destroy other torpedo boats". Although the term "destroyer" had been used interchangeably with "TBD" and "torpedo boat destroyer" by navies since 1892, the term "torpedo boat destroyer" had been generally shortened to simply "destroyer" by nearly all navies by the First World War.
A light cruiser is a type of small or medium-sized warship. The term is a shortening of the phrase "light armored cruiser", describing a small ship that carried armor in the same way as an armored cruiser: a protective belt and deck. Prior to this smaller cruisers had been of the protected cruiser model, possessing armored decks only. While lighter and smaller than other contemporary ships they were still true cruisers, retaining the extended radius of action and self-sufficiency to act independently around the world. Cruisers mounting larger guns and heavier armor relative to most light cruisers would come to be known as heavy cruisers, though the designation of 'light' versus 'heavy' cruisers would vary somewhat between navies. Through their history light cruisers served in a variety of roles, primarily as convoy escorts and destroyer command ships, but also as scouts and fleet support vessels for battle fleets.
A flotilla leader was a warship of late 19th century and early 20th century navies suitable for commanding a flotilla of destroyers or other small warships, typically a small cruiser or a large destroyer. The flotilla leader provided space, equipment and staff for the flotilla commodore, including a wireless room, senior engineering and gunnery officers, and administrative staff to support the officers. Originally, older light or scout cruisers were often used, but in the early 1900s, the rapidly increasing speed of new destroyer designs meant that such vessels could no longer keep pace with their charges. Accordingly, large destroyer designs were produced for use as leaders.
Destroyer leader (DL) was the United States Navy designation for large destroyers from 9 February 1951 through the early years of the Cold War. United States ships with hull classification symbol DL were officially frigates from 1 January 1955 until 1975. The smaller destroyer leaders were reclassified as destroyers and the larger as cruisers by the United States Navy 1975 ship reclassification so destroyer escorts could be reclassified as frigates (FF) in conformance with international usage of the term.
The Capitani Romani class was a class of light cruisers acting as flotilla leaders for the Regia Marina. They were built to outrun and outgun the large new French destroyers of the Le Fantasque and Mogador classes. Twelve hulls were ordered in late 1939, but only four were completed, just three of these before the Italian armistice in 1943. The ships were named after prominent ancient Romans.
The three Chester-class cruisers were the first United States Navy vessels to be designed and designated as fast "scout cruisers" for fleet reconnaissance. They had high speed but little armor or armament. They were authorized in January 1904, ordered in fiscal year 1905, and completed in 1908. In 1920 all scout cruisers were redesignated as "light cruisers" (CL).
The Leone class were a group of destroyers built for the Italian Navy in the early 1920s. Five ships were planned and three completed. All three ships were based at Massawa, Eritrea, during World War II and were sunk during the East African Campaign.
HMS Skirmisher was one of two Sentinel-class scout cruisers built for the Royal Navy during the first decade of the 20th century. Completed in 1905 the ship was placed in reserve until she was commissioned in 1907 as part of the Home Fleet. She then spent the next seven years moving on and off of active service in British waters. Skirmisher was assigned to coastal defence duties when the First World War began in 1914, although she was transferred to the Mediterranean in 1915 and then to the Aegean two years later. The ship returned home in mid-1919 and was sold for scrap in 1920.
The Vifor class was a group of four destroyers ordered by Romania in 1913 and built in Italy during the First World War. The four ships were however requisitioned by Italy in 1915 and rearmed as scout cruisers (esploratori), subsequently seeing service in World War I. Two were re-purchased by Romania in 1920 and saw service in World War II. The other two were eventually transferred by Italy to the Spanish Nationalists and saw service during the Spanish Civil War.
An esploratore was a type of Italian warship intermediate between destroyers and light cruisers. Before World War II, existing esploratori were reclassified as destroyers.
The Battle of the Strait of Otranto of 1917 was the result of an Austro-Hungarian raid during the Adriatic Campaign of World War I on the Otranto Barrage, an Allied naval blockade of the Strait of Otranto. The battle took place on 15 May 1917, and was the largest surface action in the Adriatic Sea during World War I. The Otranto Barrage was a fixed barrier, composed of lightly armed naval drifters with anti-submarine nets coupled with minefields and supported by Allied naval patrols.
A torpedo cruiser is a type of warship that is armed primarily with torpedoes. The major navies began building torpedo cruisers shortly after the invention of the locomotive Whitehead torpedo in the 1860s. The development of the torpedo gave rise to the Jeune École doctrine, which held that small warships armed with torpedoes could effectively and cheaply defeat much larger battleships. Torpedo cruisers fell out of favor in most of the great power navies in the 1890s, though many other navies continued to acquire them into the early 1900s.
Nino Bixio was a protected cruiser built by the Italian Regia Marina in the early 1910s. She was the lead ship of the Nino Bixio class, which were built as scouts for the main Italian fleet. She was equipped with a main battery of six 120-millimeter (4.7 in) guns and had a top speed in excess of 26 knots, but her engines proved to be troublesome in service. Nino Bixio saw service during World War I and briefly engaged the Austro-Hungarian cruiser SMS Helgoland in 1915. Her career was cut short in the post-war period due to severe cuts to the Italian naval budget, coupled with her unreliable engines. Nino Bixio was stricken from the naval register in March 1929 and sold for scrap.
Marsala was a protected cruiser built by the Italian Regia Marina in the 1910s. She was the second and final member of the Nino Bixio class, which were built as scouts for the main Italian fleet. She was equipped with a main battery of six 120-millimeter (4.7 in) guns and had a top speed in excess of 26 knots, but her engines proved to be troublesome in service. Marsala spent World War I based at Brindisi; she was involved in the Battle of the Otranto Straits in May 1917, where she briefly engaged Austro-Hungarian cruisers. Marsala's career was cut short in November 1927 when she was stricken from the naval register and sold for scrap, the result of her unreliable engines and drastic cuts to the naval budget.
NMS Mărăști was one of four Vifor-class destroyers ordered from Italy by Romania shortly before the beginning of the World War I. All four sister ships were requisitioned when Italy joined the war in 1915. Originally named Vijelie by the Romanians, she was renamed Sparviero in Italian service. Not completed until mid-1917, the ship took part in the later stages of the Adriatc campaign but engaged Austro-Hungarian Navy ships in the Adriatic Sea only twice before the war ended in November 1918. She was renamed Mărăști when the Romanians re-purchased her in 1920.
Aquila was an Italian Regia Marina scout cruiser in commission from 1917 to 1937. She was laid down for the Royal Romanian Navy as the destroyer Vifor but the Kingdom of Italy requisitioned her while she was under construction. She served in the Regia Marina during World War I, seeing action in the later stages of the Adriatic campaign. In 1928, she took part in rescue operations in the Adriatic Sea for the sunken Italian submarine F 14.
Falco was an Italian Regia Marina scout cruiser in commission from 1920 to 1937. She was laid down for the Royal Romanian Navy as the destroyer Viscol but the Kingdom of Italy requisitioned her before her construction bean. Falco was not completed until after the end of World War I, but served in the Regia Marina during the interwar period.
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