Clayton Donnell has had a life-long fascination with the Brialmont forts built at Liège and Namur. He spent his early years living in Belgium, and often visited the sites of the forts. Over the years he has amassed a large collection of material relating to this period, and has translated much of it from French to English. He has previously co-written Modern European Military Fortifications, 1870-1950: A Selected Annotated Bibliography (Praeger, 2004), and has created websites on the forts of Liège and Namur, and the Maginot Line. James Donnell has been fascinated with the Civil War ever since he made a visit to the Gettysburg battlefield in elementary school. He has studied Civil War history and tactics for 25 years. In that time, he has amassed a considerable library of military history, in general, and Civil War history in particular. In 2000, he retired from the US Air Force, and is currently living in southeast Virginia, where he spends his spare time touring the innumerable Civil War sites in the area.

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 the Aztecs, the Greeks, several 19th-century American subjects, and a number of books in the Fortress series. His work features in exhibitions and publications throughout the world.
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, 19th-century American subjects, the modern Chinese Army, and the history of fortification. His work features in exhibitions and publications throughout the world.