I.A.A.Thompson, Emeritus Fellow of the Royal Historical Society, is the author of War and Government in Habsburg Spain, a seminal study of the impact of war on the development of the state in Spain in the 16th and 17th centuries. In this volume he reprints for an English readership ten essays examining the implications for government, the financial system and Spain's position in Europe of the fundamental changes in the art and practice of war, both on land and at sea, that took place during this period. This "Military Revolution" has been one of the most contentious debates among historians for the last fifty years, but little attention has so far been paid to Spain itself, despite her predominance in Europe for much of the period. These essays are designed to correct that omission, and to assist in a fuller understanding both of the Military Revolution and of the strengths and weaknesses of the Spanish state.