I stumbled across Sieges and Siegecraft by Geoffrey Hindley, it was lucky find. Hindley is a UK medieval historian who specializes in warfare. In this book he examines siege warfare from 500 to 1500 C.E and covers aspects from equipment, strategies, mental tactics, fortification/castle designs, and rules of engagement for different periods. It was a good primer for an understanding battles of that period and it has added 7 more must see castle to my list the next time I travel in the British Isles and Europe. Overall rating 7.5/10. I am subtracting half a point b/c his bibliography style is annoying.