This is a beautifully illustrated book even by Osprey standards packed full of some of the best colour plates I have seen with 8 pages of full colour plates showing mainly aerial views of fortresses with some siege scenes and cut away sections. In addition it is packed full of colour and black and white photographs, maps, illustrations etc.
It is well written by Dr Stephen Turnbull normally know for his work on Japan, but this is a fascinating area of military construction which has been long over looked by many western text books.
The development of the Crusader Castles
The crusader castle as a defensive system
Typical crusader castles of Prussia
The living site
Crusader castles today