sentences:  Lambil was asked to continue the series in collaboration with writer Raoul Cauvin.Whereas "Sandy" was drawn in a realistic style, "Les Tuniques Bleues" was comical and humorous, even though it is set during the American Civil War and is rather graphic in its portrayal of battle and its aftermath.Due to the rapid success of "Les Tuniques Bleues" (which has become a major best-selling series), Lambil had to drop "Sandy".