
Historically a cruiser was not a type of ship but a warship role. Cruisers were ships—often frigates or smaller vessels—which were assigned a role largely independent from the fleet. Typically this might involve missions such as raiding enemy merchant shipping. In the late 19th century the term 'cruiser' came to mean ships designed to fulfill such a role, and from the 1890s to the 1950s a 'cruiser' was a warship larger than a destroyer but smaller than a battleship. For much of 19th century and the first half of the 20th, the cruiser was a navy's long-range "force projection" weapon, while the larger ships stayed nearer to home. Their main role was to attack enemy merchant vessels, so much so that this task came to be called cruiser warfare. Other roles included reconnaissance, and cruisers were often attached to the battle fleet. In the later 20th century, the decline of the battleship left the cruiser as the largest and most powerful surface combatant. However, the role of the cruiser increasingly became one of providing air defence for a fleet, rather than independent cruiser warfare. At the beginning of the 21st century, cruisers were the heaviest surface combatant ships in use, with only five nations (the United States, Russia, France, Italy and Peru) operating them. Following the Italian Navy's 2003 decommissioning of , only four nations currently operate cruisers.
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