High Quality Content by WIKIPEDIA articles! The Halcyon class was a class of 21 oil-fired minesweepers (officially, "fleet minesweeping sloops") built for the British Royal Navy between 1933 and 1939. They were given traditional small ship names used historically by the Royal Navy and served during World War II. There were 21 ships in the Halcyon class, built in two groups; the first using reciprocating steam engines, with steam turbines in the latter. They were generally smaller versions of the Grimsby class escort sloops. Niger and Salamander of the reciprocating group used vertical triple expansion engines, instead of the vertical compound engines of their sisters.

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