QF 12-pounder 12 cwt naval gun
The QF 12-pounder 12-cwt gun (Quick-Firing) was a common, versatile 3-inch (76.2 mm) calibre naval gun introduced in 1894 and used until the middle of the 20th century. It was produced by Armstrong Whitworth, Elswick and used on Royal Navy warships, exported to allied countries, and used for land service. In British service "12-pounder" was the rounded value of the projectile weight, and "12 cwt (hundredweight)" was the weight of the barrel and breech, to differentiate it from other "12-pounder" guns.
Type 41 3-inch (7.62 cm) 40 calibre gun on the Japanese battleship Mikasa
As first mounted on 27-knot destroyers from 1894, here seen on HMS Daring
Mk V gun on a British trawler, World War II
Naval brigade with a "long twelve" in Natal
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.
USS Arleigh Burke, the lead ship of her class of guided-missile destroyers.
The destroyers of the US Navy's Zumwalt-class, pictured here sailing with a Littoral combat ship (LCS) are the longest and heaviest destroyers currently in service.
The Italian Caio Duilio, belongs to the Horizon-class of Franco-Italian designed first-rate frigates.
Fernando Villaamil, credited as the inventor of the destroyer concept, died in action during the Battle of Santiago de Cuba in 1898.