It's mostly a source question, because the topic is too large to be covered by simple questions and answers, so im sorry if i posted this in the wrong place.
I'm trying to research on the differences between the typical composition (i.e. typical ratio of archers, heavy infantry, cavalry, etc.) and standard tactics during the middle ages, particularly across culture. In other words, how a standard English army differed from a standard Arab, Iranian, Greek, etc. one. (No particular reason why English is mentioned first) Im looking for sources, but having trouble because its both highly specialized (medieval army composition and tactics) and broad (not just Western Europe or one country). I was wondering if anyone could direct me to a good resource to find what im looking for.