Osprey's two-volume Medieval Tactics sheds new light on the role of infantry vs cavalry. Calvery was not as supreme as earlier authors indicate while infantry wasn't an ill-disciplined secondary element. The book also puts paid to Hanson's claims of decisive battles and continuous Western supremacy.
Just a comment, Jim, not a criticism, but Oman's Art of War in the Middle Ages, mentions a number of battles that infantry shone in.
He is usually denigrated for being Victorian, and being passe as new research emerges.
I personally, think he did great with what he could find, and much of his work still holds up.
Oh, I love Oman; I've an original of his Art of War in the Middle Ages, the two-volume re-write and all of his Peninsular War. Other historians are not as good.