Photo: Daniel Smith/Lionsgate Every line out of Henry Cavill’s mouth in The Ministry of Ungentlemanly Warfare goes something like “Cheerio, lads, jolly good to have you aboard, now let’s not find ourselves in a spot of bother,” at which point he takes out a machine gun and mows down a row of Nazis. Cavill plays Gus March-Phillipps, an actual member of Winston Churchill’s Special Operations Executive who led a top-secret mission to take out a ship key to keeping German U-boats supplied in 1942. There are five commandos in Gus’s crew, working with undercover agents played by Eiza González and...