Leroy Thompson has trained and advised military and police special-operations units around the world, focusing especially on the tactical use of firearms.

He has previously had more than 50 books published, and appeared as a weapons expert on documentaries for Discovery, National Geographic and the BBC. He lives in Missouri, USA.

Born in Malaya in 1949, Alan Gilliland studied photography/film and architecture, and spent 18 years as the graphics editor of The Daily Telegraph. He now writes, illustrates and publishes fiction as well as illustrating for a variety of publishers. He lives in Lincolnshire, UK.

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.