Von Clausewitz's On War isn't a bad place to start. It goes from theory to strategy down to some place in between strategy and tactics. I think he planned to go

Von Clausewitz's On War isn't a bad place to start. It goes from theory to strategy down to some place in between strategy and tactics. I think he planned to go further but died before completion. Of course it might have been mostly irrelevant 150 years later where there have been advancements in both military doctrine and technology that significantly shape modern tactics. But, absent a modern military thinker on his level, he's a good source. (Though he had his critics too, and I simply don't know enough about the landscape of modern military geniuses < 50 years past to recommend someone better) Here's an Amazon listing to give you a quick overview but it's old enough to get free copies. https://www.amazon.com/dp/B08QDT681F/ https://www.amazon.com/dp/B08QDT681F/