Well the whole ordering units around and such is pretty ahistorical, in reality units would likely have set instructions to follow during the battle and the general would spend his time lolloping around doing his own thing.
There are bits and pieces of evidence pointing to actual communication being used on the battlefield as a means of ordering certain units to do certain things, but this is often seen as experimentation for the most part. It was probably more a cased of positioning well and screaming 'charge!' at the right moment.
Though i'm no expert on this, I better wait for the more knowledgable EBers to comment
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