Parker is required reading especially after he extended/developed the concept of a military revolution first touted by Michael Roberts in the 50s. I would also recommend anything written by Jeremy Black esp.; Rethinking Military History, Warfare in the Eighteenth Century, Europe and the World 1650-1830, and A Military Revolution? Military Change and European Society 1550-1800 among others.
As for (G) Elton I have never much liked the "Whig historian" which see Herbert Butterfield and The Whig Interpretation of History
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