Two distinguished historians tell the story of the early modern soldier of Europe, a figure often misunderstood, in the period spanning from 1494 to 1789. He is the freebooting Landsknecht of the sixteenth century, swaggering in dilapidated finery through the ruins he and his kind created. He is the mercenary of the Thirty Years War in the seventeenth century, rootless and masterless, brutalizing civilians for a few coins, destroying civilization's...