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In page HMCS Sudbury:

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Flower-class corvettes like Sudbury serving with the Royal Canadian Navy during the Second World War were different from earlier and more traditional sail-driven corvettes.[1][2][3] The "corvette" designation was created by the French as a class of small warships; the Royal Navy borrowed the term for a period but discontinued its use in 1877.[4] During the hurried preparations for war in the late 1930s, Winston Churchill reactivated the corvette class, needing a name for smaller ships used in an escort capacity, in this case based on a whaling ship design.[5] The generic name "flower" was used to designate the class of these ships, which – in the Royal Navy – were named after flowering plants.[6]