Exactly, there must have been some sort of progression from ancient and medieval warfare which was very much close up and personal, to the horse and musket era' of massed musketry. Certainly, in he mid-17th century one still got the 'push of pike', but perhaps it was the decline of the pikeman that triggerred the change in doctrine. When everyone has something to use that kills from a distance it begins to get less appealing to stand too close.
I've never actually seen anyone cover this transition in a methodical way, most books concentrate on weapons and ignore soldiers attitudes.
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