What is the author's style in Personal Recollections of Joan of Arc by Mark Twain?

Twain uses a fictional character, the Sieur Louis de Conte, as a limited narrator from whose point of view the historical fiction is presented. The author provides two hints that he is the narrator—the initials SLC are his (Samuel L. Clemens) and the French word "conte" means story. Twain does this to disguise his authorship during the initial serialized publishing run and thereby gain more credibility for the story as a biography. However, his fairly liberal use of fictional scenes and characters brings the book to the level of historical fiction.