The History of the Peloponnesian War is a historical account of the Peloponnesian War, which was fought between the Peloponnesian League and the Delian League. The account, apparently unfinished, does not cover the full war, ending mid-sentence in 411. It was written by Thucydides, an Athenian historian who also served as an Athenian general during the war. His account of the conflict is widely considered to be a classic and regarded as one of the earliest scholarly works of history. The History is divided into eight books.