The story is told from Jonathan’s point of view, from a third person limited perspective.
Third person limited tells the story from one specific character’s point of view, limiting the narrative to focus on that one character. However, it uses the character’s name rather than first person pronouns such as “I” or “my.”
It was in the morning when Jonathan first heard the bell. He was standing in the warm, open field feeling hot, dirty, and bored. (9:58, p. 3)
By focusing on Jonathan and not really giving other characters names, Avi follows in the tradition of Crane’s naturalism in The Red Badge of Courage, letting the reality of war fall upon the reader in full force, with as little intervention as possible.