What is the author's style in The Winter King: A Novel of Arthur by Bernard Cornwell?

The Winter King is told as a memoir by an aged Christian monk, Derfel Cadarn, a contemporary and associate of Arthur. He writes as a key figure in the drama of late fifth-century Britain, employing the first-person past tense, and frequently quoting vast amounts of dialog. Derfel spends a good deal of time defending Arthur against his diverse detractors and outright enemies. While he considers his conversion sincere, Derfel writes with great nostalgia and sympathy for his former faith.