John Cairns is a professional software developer with a special emphasis on computer cartography. In collaboration with Joshua Allfree, he has worked with author Brian Todd Carey to produce Warfare in the Ancient World, Warfare in the Medieval World, Hannibal’s Last Battle and Road to Manzikert. Brian Todd Carey is an Assistant Professor of History and Military History at the American Public University System, where he has taught ancient, medieval, and early modern military history for over twenty years. His first two books, Warfare in the Ancient World and Warfare in the Medieval World, cover the history of warfare in western civilization from the Bronze Age through the Thirty Years' War. His other publications include Hannibal’s Last Battle and Road to Manzikert: Byzantine and Islamic Warfare, 527-1071. Joshua B. Allfree is an IT project manager supporting the US Army Human Resources Command at Fort Knox, Kentucky. He retired from the US Army as a Sergeant Major in 2014 after a 34-year career in the fields of both combat arms and information technology. He is a member of the Society for Military History.