This book opens with the account of the Sicilian Expedition, culminating in two very long speeches at Syracuse deliberating about how to treat the Athenian prisoners (1-33). After that the two areas again diverge, with the Greek narrative covering the Decelean War down to the battles of Arginusae and Aigospotami (35-42, 45–53, 64–74, 76-79). The Sicilian narrative recounts the beginning of the Second Carthaginian War, culminating in the rise of Dionysius the Elder to the tyranny (43-44, 54–63, 75, 80–96, 108-114).