if you share my interest in the roman empire and the legions but don`t know where to begin, this is a good starting point.
You will learn how, and why,a small city became an empire and created the most astonishing fighting machine the world had ever, or would ever, see. Notwithstanding other great empires throughout human history, most, if not all, were based upon a ruler, be it a man or a family, that collapsed after their demise. This book will show you why that was not the case with the romans, since they not only created an agressive army but armed it with much more than weapons.
The legion on the march brought with it the rule of law, civil administration, religious tolerance and a wish to absorb the new conquered people into their midst, conceding citizenship and trading benefits once victory was reached.
Their amazing fortitude in batlle, not giving up despite huge losses, magnanimity once it was all over or ruthless massacres to prevent further revolts if necessary, can only be seen as instruments of a much higher design when on top of it all from the conquered later on came the new legionaires, senators, consuls, and even emperors.
How it ends is also shown. And a version of why, presented.
"Roman Warfare" shows it all. And made me want to go deeper.
What else can you wish for your money on a book ?