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I really don't see how this is different from the well-documented mounted and foot banners functioning as both rallying points and movement indicators, commonly in use before, during and after the medieval period everywhere, or the signal horns we have preserved in droves from the entire medieval period in the west (or, again, anywhere) - or the enormous numbers of accounts we have of a vast array of different tactical movements of infantry and cavalry in european sources from at least as early as the 800s (before that the sources are usually from later secondary accounts and thus not entirely trustworthy). Feigned retreats, inverted wedges, infantry screening cavalry horses from archery, infantry disorganizing opposing infantry to enable loose-order heavy cavalry to destroy them, archers close supporting cavalry to disorder enemy formations - the whole Vegetian panoply of battlefield tactics and more. Even from the extreme edges of europe we have, for example, norse and irish armies manouvering to signals and banner placements - the commanders usually keeping it as simple as possible for the mustered troops and conducting more creative movements with the professional forces.
Well I may not have been clear enough, but for most of the middle-ages battlefield communications in the Byzantine Empire and by the Muslims were more advanced than what they were in Europe. Regrettably I am not able to go into detail at the moment since that would mean finding a book or something, and I don't have the patience to do that now.