This book, like its companions on Thucydides books I and IV, is published primarily for students approaching a book of Thucydides for the first time or studying the Peloponnesian War in a more general way. The Greek text and notes are those of E.C. Marchant, originally published in 1891, and the introduction is by Thomas Wiedemann, who takes into account the needs of the modern student and up-to-date research on Thucydides.