He has over thirty books to his name, divided between classical history and modern British political-military history. His previous books for Pen & Sword are Hellenistic and Roman Naval Wars; Wars of the Maccabees; Traditional Enemies: Britain's War with Vichy France 1940-42, Roman Conquests: Egypt and Judaea; and Rome, Parthia and India: The Violent Emergence of a New World Order: 150-140 BC. He is already working on a three-volume history of the Seleukid Empire.