Modern Strategy is a book important to my understanding of the history of the 20th century. Colin Gray's explanation of the century in terms of strategic activity, foreign policy, and war is fascinating and instructional. Among his many salient points, he hammers 2 repeatedly: strategy is a continuous process, a constant stream of strategic competition between nations, and the practice of strategy itself, which is unaffected by technological progress, has remained unchanged through all of history, from the time of Thucydides through all the great military captains and all the wars of a bloody 20th century. Those same practices are just as appropriate today and are being practiced as I write here and you read there. Indeed, despite the relatively recent advent of such technological advances as the internal combustion engine, airplane, tank, nuclear weapons, submarines, space technology and the uses of cyberspace, the ideas behind and needs for strategy remain the same. The book's an important overview of the strategic concerns of our day. More, it imposes order for the understanding of a grand concept by using examples of historical record to illuminate the principles and philosophies he explains. Gray is a Clausewitzian dnd leans heavily on the theories of the great Prussian strategist. Though some recognition of the concpt and practice has been used by states through all of history, Gray's idea seems to be that Clausewitz discovered strategy, placing him firmly in the stream of strategic history running from Thucydides to David Patraeus. I believe Gray writes with wisdom about his subject, and always with interesting perspectives. He treats the Cold War, 1947 to 1989, for instance, as an actual conflict and considers it especially important in demonstrating how the principles he writes about played their part in the outcome. His analysis of U. S. strategy in Vietnam is scattered throughout the book and both confirmed my own ideas and taught me new ways of seeing. Two chapters are devoted to the strategic use of nuclear weapons and the arms race dominating the 2d half of the century. Surprisingly but convincingly, he equates the strategic learning curve of the nuclear age with that of World War I. He writes that the strategists of present-day nuclear arsenals had to solve new tactical and operational problems brought about by new technologies just as the high commands of the armies of the Great War. It's a rich brew he cooks up, blending together and slowly simmering for 364 pages the ingredients of foreign policy, strategy, history, and war. In the end you can't take any of the ingredients out--they're essential to the ideas he cooks up. You can't take strategy out of foreign policy or foreign policy out of strategy. History is a constant stream of strategic competition between nations in which wars are arrythmic pulses in the stream. He concludes with an interesting discussion of what he calls "bad times." He means open conflict, of course, and considers the persistence of bad times in history a fact of the human condition. It's always been with us, and always will be, so there will always be a need for strategy. Modern times, he says, the century just past, was a truly bad time.