I don't have much to contribute here, other than to recommend: 
 
The Medieval Warhorse - From Byzantium to the Crusades. Ann Hyland, 1996 
 
Copies can be had fairly cheaply from the usual sources. It has been years since I read it, but I recall being rather impressed by the author's scholarship.
		 
		
		
		
		
		
		
		
	 |