44 books in series

Osprey Fortress

Osprey Fortress is a 42-book series with 44 primary works first released in 2003 with contributions by Nic Fields, Stephen Turnbull, Peter Harrington, Ryan Lavelle, Christopher Gravett, David Nicolle, Paddy Griffith, Duncan B. Campbell, Stuart Reid, H.W. Kaufmann, J.E. Kaufmann, Angus Konstam, Konstantin Nossov, Samuel Rocca, Gordon L. Rottman, Keith Durham, Steven J. Zaloga, Michael Brown, Michael McNally, Carola Vogel, Peter Harrison, and Peter Dennis.