Which book completed C.S. Lewis's Chronicles of Narnia in publication order?

The Last Battle completed C.S. Lewis's Chronicles of Narnia in publication order. It was published in 1956 as the seventh and final Narnia book released by Lewis.

The novel depicts the final conflict in Narnia and brings together themes of loyalty, deception, judgment, and a world beyond the familiar Narnian landscape. It won the Carnegie Medal in 1957, a major British award for children's literature.

Publication order and internal chronology are often mixed up. The Last Battle is the final book in both the publication sequence and the main narrative arc, but the books are not numbered consistently in every edition. Some editions number The Lion, the Witch and the Wardrobe first, while others arrange the stories by fictional chronology beginning with The Magician's Nephew.