Clayton Donnell has had a life-long fascination with forts. He has previously written Fortress 60: The Forts of the Meuse in World War I (Osprey, 2006) 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. Brian Delf began his career working in a London art studio producing artwork for advertising and commercial publications. Since 1972, he has worked as a freelance illustrator on a variety of subjects including natural history, architecture and technical cutaways. His illustrations have been published in over thirty countries. Brian lives and works in Oxfordshire.