Flower-class corvettes like Lévis serving with the Royal Canadian Navy during the Second World War were different from earlier and more traditional sail-driven corvettes. 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. 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. The generic name "flower" was used to designate the class of these ships, which – in the Royal Navy – were named after flowering plants. Corvettes commissioned by the Royal Canadian Navy during the Second World War were named after communities for the most part, to better represent the people who took part in building them. This idea was put forth by Admiral Percy W. Nelles. Sponsors were commonly associated with the community for which the ship was named. Royal Navy corvettes were designed as open sea escorts, while Canadian corvettes were developed for coastal auxiliary roles which was exemplified by their minesweeping gear. Eventually the Canadian corvettes would be modified to allow them to perform better on the open seas.
Upon joining the fleet, Lévis was assigned to convoy escort duty in the Northwest Atlantic. In June 1941 she joined the Newfoundland Escort Force. She did one round trip to Iceland before joining convoy SC-44. Lévis was part of the 19th Escort Group escorting convoy SC-44 when she was torpedoed at 0205 local time on 19 September 1941 by U-74 under the command of Eitel-Friedrich Kentrat east of Cape Farewell at position. The explosion of the torpedo on the port side killed all but 2 of the ratings on the stokers' messdeck. Compartments up to the No. 2 bulkhead were flooded. The surviving crew abandoned ship to except for a damage control party of 10 officers and ratings. Mayflower took Lévis under tow for approximately 12 hours, however No. 2 bulkhead was buckled and not watertight and the ship sank at 1710 local time later that day. 91 crew were rescued and 18 were killed as a result of the torpedo attack. Lévis was the first Canadian Flower-class corvette to be sunk. Her first and only commanding officer was Lieutenant Charles Walter Gilding RCNR.
