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In 1603 all English warships with a complement of fewer than 160 men were known as 'small ships'. In 1625/26 to establish pay rates for officers, a six-tier naval ship rating system was introduced.[1] These small ships were divided into three tiers: fourth-, fifth- and sixth-rates. Up to the end of the 17th century, the number of guns and the complement size were adjusted until the rating system was actually clarified. A 'fourth-rate' was nominally a ship of over thirty guns with a complement of 140 men.
In therating system of the Royal Navy used to categorize sailingwarships in the 18th century, afourth-rate was aship of the line with 46 to 60 guns mounted. They were phased out ofship of the line service during theFrench Revolutionary andNapoleonic Wars, as their usefulness was declining; though they were still in service, especially on distant stations such as the East Indies.Fourth-rates took many forms, initially as small two-decked warships, later as large frigatesrazéed from the initial two-deck warships, and occasionally even heavily armed merchant ships such asHMSCalcutta.
Afourth-rate was, in the BritishRoyal Navy during the first half of the 18th century, aship of the line mounting from 46 up to 60 guns. While the number of guns stayed in the same range until 1817, after 1756 the ships of 50 guns and below were considered too weak to stand in the line of battle, although the remaining 60-gun ships were still classed as fit to be ships of the line. However, the 50-gun ship continued to be used largely during theSeven Years' War, and during the time of theAmerican Revolution a whole new group of 50-gun ships was constructed, not for the battle fleet, but to meet the needs of combat in the shallow waters off North America where the larger ships found it difficult to sail. 50-gun ships were also suitable as convoy escorts and for service on foreign stations, where larger enemy vessels were unlikely to be encountered. Some saw service as flagships since, as two-deckers, they were able to accommodate a flag officer and his retinue, and they also had the physical presence of a flagship. Their usefulness was declining, however, and during theFrench Revolutionary andNapoleonic Wars few 50s were built, although several remained in service, especially on distant stations such as the East Indies. The 60-gun ships were also dying out, superseded initially by the 74-gunthird-rates, although by 1793 there were still four 60-gun ships left in harbour service.
Some fourth-rates did remain in active service even during the Napoleonic Wars, especially in the shallowNorth Sea, where theRoyal Navy's main opponents were the Baltic powers and theBatavian Republic, whose navies' ships of the lines consisted mainly of 50- to 64-gun ships (e.g. the 56-gunBatavian Navy ship of the lineDelft). However,HMSLeander, 50 guns, was withHoratio Nelson at theBattle of the Nile. As late as 1807, fourth-rates were active in combat zones, illustrated by thefatal incident betweenHMSLeopard (50 guns), and the USfrigateChesapeake (38 guns), an incident which nearly led to war.
American 44-gun frigatesConstitution,United States andPresident were never in operational use armed with fewer than 50 guns includingcarronades, and were generally seen as equivalent to fourth-rates.[citation needed] The larger British 24-pounder frigates such as the later 1813Leander andNewcastle, were of similar firepower to those big American 44s. The latter were launched (orrazéed – i.e. converted by cutting down by one deck from existing smaller third-rate 74-gun two-deckers) during the last years of the Napoleonic War and theWar of 1812 and were classed as fourth-rates in Royal Naval service under the revised rating system. This convention continued into the 19th century. Any of these later large fourth-rate frigates threw a close-range broadside (including from their heavy carronades) far superior to the earlier two-decker 50s or even to third-rate 64s.
Some ships of commerce such as theEast Indiamen were heavily armed to protect themselves frompirates andprivateers, effectively making them equivalent to fourth-rate ships of the line. The Royal Navy also converted some East Indiamen into fourth-rates for convoy duty, such asHMSCalcutta.
