From their announcement:
Wargames Fever is pleased to bring you Ager Sanguinis, wargaming rules for Crusader warfare 1095-1150 by James Roach.
Originally published as a part-work in Miniature Wargames magazine in 2009-10 - and long sold out in hardcopy - the rules are now available again as a 32 page PDF download:
Christian Army Lists
Muslim Army Lists
Campaign Rules & Map
Illustrated throughout in full colour.
Available from www.wargamesfever.com