Eulalia! is the 19th book in the Redwall novel series by author Brian Jacques and illustrated by David Elliot. "Eulalia" ("Victory") is also the war cry used by the fighting hares and badgers in the Redwall series. It comes from "Weialala leia", the lament of the Valkyries in Richard Wagner's opera Götterdämmerung, as quoted by T. S. Eliot in The Waste Land.The novel was going to be released in 2006 (to continue the pattern that a new Redwall book is released every year), but was delayed.