Considered a modern classic on early modern warfare, first published in 1988, now in 2nd ed, unfortunately it doesn't seem to be available in digital format:
Geoffrey Parker The Military Revolution: Military Innovation and the Rise of the West, 1500-1800
https://www.amazon.com/Military-Revo.../dp/0521479584
A bit older (published in 1937), but a classic that is available in Kindle format. I couldn't resist buying it myself just now:
A History of the Art of War in the Sixteenth Century by Sir Charles Oman US$3.21 at Amazon.com
https://www.amazon.com/History-Art-W.../dp/B07CB8SP75
The Amazon blurb:
"THE BEST ACCOUNT OF SIXTEENTH-CENTURY WARFARE BY THE AUTHOR OF A HISTORY OF THE PENINSULAR WAR
This is an unrivalled account of sixteenth-century warfare, in which Sir Charles Oman traces the dramatic, far-reaching changes in the military strategy, tactics and organization of the period.
Showing how warfare developed, he covers the Great Wars of 1949-1559; military events in Tudor England, including Henry VIII’s continental wars; the French Wars of Religion, 1562-98; the Dutch revolt and war of independence, 1568-1603; and the Turkish offensive against Christendom, from 1520 until the Peace of Sitva Torok in 1606.
The battles, sieges and campaigns that Oman examines in detail clarify military development across the century, such as Ravenna (1512), the first battle won by dominance in artillery; Pavia (1525), a ‘victory by surprise’; Pinkie (1547), where an old-fashioned infantry army proved helpless against the combination of all arms; and Arques (1589), exemplifying the defence of a defile by very inferior number.
Contemporary maps illustrate many of the actions, and add to the value of this brilliant and lucid history of the art of war.
Sir Charles Oman was one of Britain’s foremost historians and a gifted writer. His books, noted for being both scholarly and accessible, include the two-volume History of the Art of War in the Middle Ages, the seven-volume A History of the Peninsular War and others."
I have Allan Mallinson's
The Making Of The British Army on my TBR. I've read his
1914: Fight the Good Fight: Britain, the Army and the Coming of the First World War, and thought it was quite good. He is the author of the Matthew Hervey series, a long serving officer in the British army who rose to command of his regiment (the 13th/18th Hussars), and retired as a Brig Gen, so his chops as a writer and a popular military historian are good.
Unfortunately, for your purposes, coverage starts at the English Civil War, and is limited to the British army.
$10.36 at Amazon.com
https://www.amazon.com/Making-Britis.../dp/B0031RDW36