Frigate A frigate is any of several types of warship , the term having been used for ships of various sizes and roles over the last few centuries . In the 17th century , the term was used for any warship built for speed and maneuverability , the description often used being " frigate - built " . These could be warships carrying their principal battery of carriage - mounted guns on a single deck or on two decks ( with further smaller carriage - mounted guns usually carried on the forecastle and quarterdeck of the vessel ) . The term was generally used for ships too small to stand in the line of battle , although early line - of - battle ships were frequently referred to as frigates when they were built for speed . In the 18th century , the term referred to ships which were usually as long as a ship - of - the - line and were square - rigged on all three masts ( full rigged ) , but were faster and with lighter armament , used for patrolling and escort . In the definition adopted by the British Admiralty , they were rated ships of at least 28 guns , carrying their principal armament upon a single continuous deck — the upper deck , while ships - of - the - line possessed two or more continuous decks bearing batteries of guns . In the late 19th century ( beginning about 1858 with the construction of prototypes by the British and French navies ) , the armoured frigate was a type of ironclad warship which for a time was the most powerful type of vessel afloat . The term " frigate " was used because such ships still mounted their principal armament on a single continuous upper deck . The later 19th century battleship thus developed from the frigate rather than from the ship of the line . In modern navies , frigates are used to protect other warships and merchant - marine ships , especially as anti - submarine warfare ( ASW ) combatants for amphibious expeditionary forces , underway replenishment groups , and merchant convoys . Ship classes dubbed " frigates " have also more closely resembled corvette s , destroyer s , cruiser s and even battleship s . The rank " frigate captain " derives from the name of this type of ship . Age of sail . Origins . The term " frigate " ( Italian : " fregata " ; Spanish / Catalan / Portuguese / Sicilian : " fragata " ; Dutch : " fregat " ; French : " fregate " ) originated in the Mediterranean in the late 15th century , referring to a lighter galleass type ship with oars , sails and a light armament , built for speed and maneuverability . The ultimate etymology of the word , however , is unknown . In 1583 , during the Eighty Years ' War , Habsburg Spain recovered the Southern Netherlands from the rebellious Dutch . This soon led to the occupied ports being used as bases for privateers , the Dunkirker s , to attack the shipping of the Dutch and their allies . To achieve this they developed small , maneuverable , sail - only vessels that came to be referred to as frigates . The success of these Dunkirker vessels influenced the ship design of the Dutch and other navies contending with them but because most regular navies required ships of greater endurance than the Dunkirker frigates could provide , the term was soon applied less exclusively to any relatively fast and elegant sail - only war ship . Even the mighty English was described as ' a delicate frigate ' after modifications in 1651 . The navy of the Dutch Republic was the first navy to build the larger ocean - going frigates . The Dutch navy had three principal tasks in the struggle against Spain : to protect Dutch merchant ships at sea , to blockade the ports of Spanish - held Flanders to damage trade and halt enemy privateering , and to fight the Spanish fleet and prevent troop landings . The first two tasks required speed , shallowness of draft for the shallow waters around the Netherlands , and the ability to carry sufficient supplies to maintain a blockade . The third task required heavy armament , sufficient to fight against the Spanish fleet . The first of these larger battle - capable frigates were built around 1600 at Hoorn in Holland . By the later stages of the Eighty Years War the Dutch had switched entirely from the heavier ships still used by the English and Spanish to the lighter frigates , carrying around 40 guns and weighing around 300 tons . The effectiveness of the Dutch frigates became most visible in the Battle of the Downs in 1639 , encouraging most other navies , especially the English , to adopt similar designs . The fleets built by the Commonwealth of England in the 1650s generally consisted of ships described as " frigates " , the largest of which were two - decker ' great frigates ' of the third rate . Carrying 60 guns , these vessels were as big and capable as ' great ships ' of the time ; however , most other frigates at the time were used as ' cruiser s ' : independent fast ships . The term " frigate " implied a long hull design , which relates directly to speed ( see hull speed ) and also , in turn , helped the development of the broadside tactic in naval warfare . At this time a further design evolved , reintroducing oars to create the galley frigate such as the " Charles Galley " of 1676 which was rated as a 32 - gun fifth rate but also had a bank of 40 oars set below the upper deck which could be used to propel the ship in the absence of a favourable wind . In French , the term " frigate " became a verb , meaning ' to build long and low ' , and an adjective , adding further confusion . In Danish , the word " fregat " is often applied to warships carrying as few as 16 guns , such as HMS Falcon ( 1802 ) which the British classified as a sloop . Under the rating system of the Royal Navy , by the middle of the 18th century , the term " frigate " was technically restricted to single - decked ships of the fifth rate , though small 28 - gun frigates were classed as sixth rate . Classic design . The classic sailing frigate , well - known today for its role in the Napoleonic wars , can be traced back to French developments in the second quarter of the 18th century . The French - built " Médée " of 1740 is often regarded as the first example of this type . These ships were square - rigged and carried all their main guns on a single continuous upper deck . The lower deck , known as the " gun deck " , now carried no armament , and functioned as a " berth deck " where the crew lived , and was in fact placed below the waterline of the new frigates . The new sailing frigates were able to fight with all their guns when the seas were so rough that comparable two - deckers had to close the gun - ports on their lower decks ( see the Action of 13 January 1797 , for an example when this was decisive ) . Like the larger 74 which was developed at the same time , the new frigates sailed very well and were good fighting vessels due to a combination of long hulls and low upperworks compared to vessels of comparable size and firepower . The Royal Navy captured a handful of the new French frigates during the War of the Austrian Succession ( 1740 – 1748 ) and were impressed by them , particularly for their inshore handling capabilities . They soon built copies and started to adapt the type to their own needs , setting the standard for other frigates as the leading naval power . The first British frigates carried 28 guns including an upper deck battery of twenty - four 9 - pounder guns ( the remaining four smaller guns were carried on the quarter deck ) but soon developed into fifth - rate ships of 32 or 36 guns including an upper deck battery of twenty - six 12 - pounder guns , with the remaining six or ten smaller guns carried on the quarter deck and forecastle . From around 1778 , a larger " heavy " frigate was developed with a main battery of twenty - six or twenty - eight 18 - pounder guns ( again with the remaining ten smaller guns carried on the quarter deck and forecastle ) . Frigates did not carry any guns ( or have any gunports ) on their lower decks ; confusingly , the lower deck was often referred to as the " gun deck " in the British Royal Navy ( in the United States Navy , it was usually called the " berth deck " ) , even for frigates , where it did not carry any guns or have gunports . Both types could ( and usually did ) additionally carry smaller carriage - mounted guns on their quarter decks and forecastle s ( the superstructures above the upper deck ) . Technically , rated ships with fewer than 28 guns could not be classed as frigates but as " post ship s " ; however , in common parlance most post ships were often described as " frigates " , the same casual misuse of the term being extended to smaller two - decked ships that were too small to stand in the line of battle . Royal Navy frigates of the late 18th century included the 1780 - vintage " Perseverance " class , which measured around 900 tons burthen and carried 36 guns ; this successful class was followed by numerous other classes that measured over 1 , 000 tons burthen and carried 38 guns . In 1797 , three of the US Navy ' s first six major ships were rated as 44 - gun frigates ( or " super - frigates " ) , which operationally carried fifty - six to sixty 24 - pounder long guns and 32 - pounder or 42 - pounder carronade s on two decks ; by all regards they were exceptionally powerful and tough . These ships were so well - armed that they were often regarded as equal to ships of the line , and after a series of losses at the outbreak of the War of 1812 , Royal Navy fighting instructions ordered British frigates ( usually of 38 guns or less ) to never engage American frigates at any less than a 2 : 1 advantage . , preserved as a museum ship by the US Navy , is the oldest commissioned frigate afloat , and is a surviving example of a frigate from the Age of Sail . " Constitution " and her two sister ships ( USS " President " and USS " United States " ) were created in a response to deal with the Barbary Coast pirates and in conjunction with the Naval Act of 1794 . The three big frigates , when built , had a distinctive building pattern which minimised " hogging " ( in which the centre of the keel rises while both ends drop ) and improves hydrodynamic efficiency . The hull was designed so that all the weight from the guns was upon the keel itself . Joshua Humphreys proposed that only live oak , a tree that grew only in America , should be used to build these ships . The method was to use diagonal riders , eight on each side that sat a 45 degree angle . These beams of live oak were about two feet wide and around a foot thick and helped to maintain the shape of the hull , serving also to reduce flexibility and to minimize impacts . These ideas were considered revolutionary in the late 18th and early 19th century . A three - layer method was used in which the planks along the sides of the hull were laid horizontally across the ribs , making a crossing or checker board pattern . The sides of the ship could be as thick as 25 inches , and were able to absorb substantial damage . The strength of this braced construction earned USS " Constitution " the nickname " Old Ironsides " . Role . Frigates were perhaps the hardest - worked of warship types during the Age of Sail . While smaller than a ship - of - the - line , they were formidable opponents for the large numbers of sloop s and gunboat s , not to mention privateer s or merchantmen . Able to carry six months ' stores , they had very long range ; and vessels larger than frigates were considered too valuable to operate independently . Frigates scouted for the fleet , went on commerce - raiding missions and patrols , and conveyed messages and dignitaries . Usually frigates would fight in small numbers or singly against other frigates . They would avoid contact with ships - of - the - line ; even in the midst of a fleet engagement it was bad etiquette for a ship of the line to fire on an enemy frigate which had not fired first . Frigates were involved in fleet battles , often as ' repeating frigates ' . In the smoke and confusion of battle , signals made by the fleet commander , whose flagship might be in the thick of the fighting , might be missed by the other ships of the fleet . Frigates were therefore stationed to windward or leeward of the main line of battle , and had to maintain a clear line of sight to the commander ' s flagship . Signals from the flagship were then repeated by the frigates , which themselves standing out of the line and clear from the smoke and disorder of battle , could be more easily seen by the other ships of the fleet . If damage or loss of masts prevented the flagship from making clear conventional signals , the repeating frigates could interpret them and hoist their own in the correct manner , passing on the commander ' s instructions clearly . For officers in the Royal Navy a frigate was a desirable posting . Frigates often saw action , which meant a greater chance of glory , promotion , and prize money . Unlike larger ships that were placed in ordinary , frigates were kept in service in peacetime as a cost - saving measure and to provide experience to frigate captains and officers which would be useful in wartime . Frigates could also carry marines for boarding enemy ships or for operations on shore – in 1832 , the frigate USS " Potomac " landed a party of 282 sailors and Marines ashore in the US Navy ' s first Sumatran expedition . Common armament was one gundeck with 32 to 44 long guns , from 8 - to 24 - pounders ( 3 . 6 to 11 kg ) , plus a few carronade s ( large bore short - range guns ) . Frigates remained a crucial element of navies until the mid - 19th century . The first ironclad s were classified as " frigates " because of the number of guns they carried . However , terminology changed as iron and steam became the norm , and the role of the frigate was assumed first by the protected cruiser and then by the light cruiser . Frigates are often the vessel of choice in historical naval novels due to their relative freedom compared to ships of the line ( kept for fleet actions ) and smaller vessels ( generally assigned to a home port and less widely ranging ) . For example the Patrick O ' Brian Aubrey – Maturin series , C . S . Forester ' s Horatio Hornblower series and Alexander Kent ' s Richard Bolitho series . The motion picture " " features a reconstructed historic frigate , HMS " Rose " , to depict Aubrey ' s frigate HMS " Surprise " . Age of steam . Vessels classed as frigates continued to play a great role in navies with the adoption of steam power in the 19th century . In the 1830s navies experimented with large paddle steamers equipped with large guns mounted on one deck , which were termed " paddle frigates " . From the mid - 1840s frigates which more closely resembled the traditional sailing frigate were built with steam engines and screw propellers . These " screw frigate s " , built first of wood and later of iron , continued to perform the traditional role of the frigate until late in the 19th century . Armoured frigate . From 1859 , armour was added to ships based on existing frigate and ship of the line designs . The additional weight of the armour on these first ironclad warship s meant that they could have only one gun deck , and they were technically frigates , even though they were more powerful than existing ships - of - the - line and occupied the same strategic role . The phrase " armoured frigate " remained in use for some time to denote a sail - equipped , broadside - firing type of ironclad . After 1875 , the term " frigate " fell out of use . Vessels with armoured sides were designated as " battleship s " or " armoured cruiser s " , while " protected cruiser s " only possessed an armoured deck , and unarmoured vessels , including frigates and sloops , were classified as " unprotected cruisers " . Second World War . Modern frigates are related to earlier frigates only by name . The term " frigate " was readopted during World War II by the Royal Navy to describe an anti - submarine escort vessel that was larger than a corvette , smaller than a destroyer , and were about equal in size and capability with the American destroyer escort . Anti - submarine escorts had previously been classified as sloops by the Royal Navy , and the Black Swan - class sloops of 1939 – 45 were as large as the new types of frigate , and more heavily armed . 22 of these were reclassified as Frigates after the war , as were the remaining 24 smaller Castle class corvettes . The frigate was introduced to remedy some of the shortcomings inherent in the corvette design : limited armament , a hull form not suited to open - ocean work , a single shaft which limited speed and maneuverability , and a lack of range . The frigate was designed and built to the same mercantile construction standards ( scantling s ) as the corvette , allowing manufacture by yards unused to warship construction . The first frigates of the River class ( 1941 ) were essentially two sets of corvette machinery in one larger hull , armed with the latest Hedgehog anti - submarine weapon . The frigate possessed less offensive firepower and speed than a destroyer , but such qualities were not required for anti - submarine warfare . Submarines were slow while submerged , and ASDIC sets did not operate effectively at speeds of over 20 knots . Rather , the frigate was an austere and weatherly vessel suitable for mass - construction and fitted with the latest innovations in anti - submarine warfare . As the frigate was intended purely for convoy duties , and not to deploy with the fleet , it had limited range and speed . The contemporaneous German " Flottenbegleiter " ( " fleet escorts " ) , also known as " F - Boats " were essentially frigates . They were based on a pre - war " Oberkommando der Marine " concept of vessels which could fill roles such as fast minesweeper , minelayer , merchant escort and anti - submarine vessel . Because of the Treaty of Versailles their displacement was officially limited to 600 tons , although in reality they exceeded this by about 100 tons . F - boats had two stacks and two 105 mm gun turrets . The design was flawed because of its narrow beam , sharp bow and unreliable high pressure steam turbines . F - boats were succeeded in operational duties by Type 35 and Elbing class torpedo boat s . " Flottenbegleiter " remained in service as advanced training vessels . It was not until the Royal Navy ' s Bay class of 1944 that a British design classified as a " frigate " was produced for fleet use , although it still suffered from limited speed . These anti - aircraft frigates , built on incomplete Loch - class frigate hulls , were similar to the United States Navy s destroyer escort s ( DE ) , although the latter had greater speed and offensive armament to better suit them to fleet deployments . The destroyer escort concept came from design studies by the General Board of the United States Navy in 1940 , as modified by requirements established by a British commission in 1941 prior to the American entry into the war , for deep - water escorts . The American - built destroyer escorts serving in the British Royal Navy were rated as Captain - class frigates . The U . S . Navys two Canadian - built " Asheville " - class and 96 British - influenced , American - built " Tacoma " - class frigates that followed originally were classified as " patrol gunboat s " ( PG ) in the U . S . Navy but on 15 April 1943 were all reclassified as patrol frigates ( PF ) . In preservation and in fiction . Moored on the Thames Embankment in London are two surviving Royal Navy anti - submarine sloops , which are the predecessors of the WW2 frigates : Modern Age . Guided missile role . The introduction of the surface - to - air missile after the Second World War made relatively small ships effective for anti - aircraft warfare : the " guided missile frigate . " In the USN , these vessels were called " ocean escort s " and designated " DE " or " DEG " until 1975 – a holdover from the World War II destroyer escort or " DE " . The British Royal Navy maintained the use of the term " frigate " ; likewise , the French Navy refers to missile - equipped ship , up to cruiser - sized ships , by the name of " frégate " , while smaller units are named " aviso " . Soviet Navy used the term " guard - ship " ( " сторожевой корабль " ) . From the 1950s to the 1970s , the United States Navy commissioned ships classed as guided missile frigates which were actually anti - aircraft warfare cruiser s built on destroyer - style hulls . Some of these ships — the " Bainbridge " , " Truxtun " , " California " and " Virginia " classes — were nuclear - powered . These " frigates " were roughly mid - way in size between cruisers and destroyers . This was similar to the use of the term " frigate " during the age of sail during which it referred to a medium - sized warship , but it was inconsistent with conventions used by other contemporary navies which regarded frigates as being smaller than destroyers . During the 1975 ship reclassification , the large American frigates were redesignated as cruisers or destroyers , while ocean escort s ( the American classification for ships smaller than destroyers ) were renamed as frigates . One of the most successful post - 1945 designs was the British " Leander " - class frigate , which was used by several navies . Laid down in 1959 , the " Leanders " were based on the previous Type 12 anti - submarine frigate but equipped for anti - aircraft use as well . They were used by the UK into the 1990s , at which point some were sold onto other navies . The " Leander " design , or improved versions of it , were licence - built for other navies . Nearly all modern frigates are equipped with some form of offensive or defensive missiles , and as such are rated as guided - missile frigates ( FFG ) . Improvements in surface - to - air missiles ( e . g . , the Eurosam Aster 15 ) allow modern guided - missile frigates to form the core of many modern navies and to be used as a fleet defence platform , without the need for specialised anti - air warfare frigates . Other uses . The Royal Navy Type 61 " Salisbury " class were " air direction " frigates equipped to track aircraft . To this end they had reduced armament compared to the Type 41 " Leopard " - class air - defence frigates built on the same hull . Multi - role frigates like MEKO 200 , " Anzac " class frigate and " Halifax " class frigate are designed for navies needing warships deployed in a variety of situations that a general frigate class would not be able to fulfill and not requiring the need for deploying Destroyers . Anti - submarine role . At the opposite end of the spectrum , some frigates are specialised for anti - submarine warfare . Increasing submarine speeds towards the end of the Second World War ( see German Type XXI submarine ) greatly reduced the margin of speed superiority of frigate over submarine . The frigate could no longer be slow and powered by mercantile machinery and consequently postwar frigates , such as the " Whitby " class , were faster . Such ships carry improved sonar equipment , such as the variable depth sonar or towed array , and specialised weapons such as torpedo es , forward - throwing weapons such as Limbo and missile - carried anti - submarine torpedoes such as ASROC or Ikara . Surface - to - air missiles such as Sea Sparrow and surface - to - surface missiles such as Exocet give them defensive and offensive capabilities . The Royal Navy ' s original Type 22 frigate is an example of a specialised anti - submarine warfare frigate . Especially for anti - submarine warfare , most modern frigates have a landing deck and hangar aft to operate helicopter s , eliminating the need for the frigate to close with unknown sub - surface threats , and using fast helicopters to attack nuclear submarines which may be faster than surface warships . For this task the helicopter is equipped with sensors such as sonobuoy s , wire - mounted dipping sonar and magnetic anomaly detector s to identify possible threats , and torpedoes or depth - charge s to attack them . With their onboard radar helicopters can also be used to reconnoitre over - the - horizon targets and , if equipped with anti - ship missile s such as Penguin or Sea Skua , to attack them . The helicopter is also invaluable for search and rescue operation and has largely replaced the use of small boats or the jackstay rig for such duties as transferring personnel , mail and cargo between ships or to shore . With helicopters these tasks can be accomplished faster and less dangerously , and without the need for the frigate to slow down or change course . Further developments . Stealth technology has been introduced in modern frigate design . Frigate shapes are designed to offer a minimal radar cross section , which also lends them good air penetration ; the maneuverability of these frigates has been compared to that of sailing ships . Examples are the French " La Fayette " class with the Aster 15 missile for anti - missile capabilities , the German F125 class and " Sachsen " - class frigates , the Turkish TF - 2000 type frigates with the MK - 41 VLS , and the Indian " Shivalik " class frigate and " Talwar " class frigate with the Brahmos missile system . The modern French Navy applies the term first - class frigate and second - class frigate to both destroyers and frigates in service . Pennant numbers remain divided between F - series numbers for those ships internationally recognised as frigates and D - series pennant numbers for those more traditionally recognised as destroyers . This can result in some confusion as certain classes are referred to as frigates in French service while similar ships in other navies are referred to as destroyers . This also results in some recent classes of French ships being among the largest in the world to carry the rating of frigate . In the German Navy frigates were used to replace aging destroyers ; however in size and role the new German frigates exceed the former class of destroyers . The future German F125 class frigate will be the largest class of frigates worldwide with a displacement of more than 7 , 200 tons . The same was done in the Spanish Navy , which went ahead with the deployment of the first Aegis frigates , the Álvaro de Bazán class frigate s . Littoral Combat Ship ( LCS ) replaces frigates in United States Navy . Some new classes of ships similar to corvettes are optimized for high - speed deployment and combat with small craft rather than combat between equal opponents ; an example is the U . S . Littoral Combat Ship ( LCS ) . By 2019 , all " Oliver Hazard Perry " - class frigates in the United States Navy are to be replaced by the LCS . While the LCS class ships are smaller than the frigate class they will replace , they offer a similar degree of weaponry while requiring less than half the crew complement and offering a top speed of over 40 knots . A major advantage for the LCS ships is that they are designed around specific mission modules allowing them to fulfill a variety of roles . The modular system also allows for most upgrades to be performed ashore and installed later into the ship , keeping the ships available for deployment for the maximum time . See also . Lists . Note that Algerian , Tripolitan and Tunisian sail frigates are listed under Turkey . All Italian city - state frigates are listed under Italy .