Editing Sloop-of-war (section)

===World War II===
{{See also|List of frigates of World War II}}
During [[World War II]], 37 ships of the {{sclass|Black Swan|sloop|4}} were built for convoy escort duties. However, the warship-standards construction, propulsion and sophisticated armaments of the sloop of that time shared [[Bottleneck (production)|bottlenecks]] with destroyers and did not lend themselves to mass production on commercial shipyards, thus the sloop was supplanted by the [[corvette]], and later the [[frigate]], as the primary escort vessel of the Royal Navy. Built to mercantile standards and with (initially) simple armaments, these vessels, notably the {{sclass2|Flower|corvette|5}} and {{sclass2|River|frigate|5}} classes, were produced in large numbers for the [[Battle of the Atlantic]]. In 1948 the Royal Navy reclassified its remaining sloops and corvettes as frigates, even though the term sloop had been officially defunct for nine years.