David Nicolle is a leading expert on the history of medieval warfare, in particular the Crusades and Middle Eastern warfare, and he is a prolific writer of books on these subjects as well as articles and magazine articles. Among his many previous works are The Hundred Years War; The Mongol Warlords;Saladin and the Saracens; The Crusades; The Medieval Warfare Sourcebook; Hattin 1187 and, most recently, Fighting for the Faith (Pen & Sword, 2007).

Adam Hook studied graphic design, and began his work as an illustrator in 1983. He specializes in detailed historical reconstructions, and has illustrated Osprey titles on subjects as diverse as the Aztecs, the Ancient Greeks, Roman battle tactics, several 19th-century American subjects, the modern Chinese Army, and a number of books in the Fortress series.

His work features in exhibitions and publications throughout the world. He lives in East Sussex, UK.