I might recommend you try out Carl von Clausewitz.

He was a Prussian officer during the Napoleonic Wars who saw a good deal of active service in both the Prussian and Russian Armies.

After though he became an instructor and began writing. After his death was published his life's work 'Vom Kriege' or On War.

It is a massive work spanning everything from how a modern national army must adapt and fight, how politics and war intersect, and how the people and the military and war intersect.

Many modern aspects of war find their origins in the work. From the idea or the 'Operational Art" thus getting from the Strategic to the Tactical. Or the "Fog of War" that what the Commander does not know is outnumbered by what he does not, and that anything he does not observe himself must be treated as suspect.

To larger ideas such as war and political theory. His famous quote is that 'War is merely the continuation of politics by other means" and that any war in order to be successful must have defined political goals that can be articulated, they can be terrible and monstrous but no war ever launched without a defined goal was a success and many with poorly thought out goals have failed.

Or even more modern ideas such as military Center of gravity, which would be a focus from Napoleon down to the modern combined arms maneuver warfare of today.

He also sought to describe war as an experiential trinity, a clash of violent passionate emotion, chance, and rational consideration. Not merely any one but a terrible combination. He wrote in the aftermath of 2 decades of almost constant war when Europe was dragged into modernity by the rise of massive national armies, war on a speed and scale never seen before, and which was continued again and again by states with shifting allegiances, vague goals, and was dominated by Grande Armee that was thoroughly national, incredibly professional, and driven by both a masterful leader and one whose personal goals were by default the state's goals.

His thinking straddling the eras has essentially set the tone for every military thinker since, doesn't matter the nation, doesn't matter the date, they are in ways all building on Clausewitz.

I would recommend the personal memoirs of Ulysses S Grant. They are well written, clear, often very funny and extremely characterful. Grant opines on everything from grand strategy to politics to the personalities of his fellow Union Generals and his opponents. His style is a combination of clear, simple prose and 19th century circumlocution. As far as character goes, he is an American original - a nobody with a couple political connections and a good war record who became general in chief because, from fort Donnelson to Appamattox, he got results.

Thank you for the recommendations guys, Carl von Clausewitz seems well and as for Ulysses S Grant I remember him from my history classes, so I know he is a class act. I'll be researching to see so thank you for this piece of info, but is there any books that focus on an individual or is all modern military strategy books are in the masses?