Modern Strategy is a major contribution to the general theory of strategy; it makes sense of the strategic history of the twentieth century, and provides understanding of what that strategic history implies for the century to come. The text offers a comprehensive analysis of the different facets of modern strategy. The classic writings of Carl von Clausewitz are reconsidered for their continuing relevance, while possible successors are appraised. The text probes deeply into strategy's political, ethical, and cultural dimension and explains how strategic behaviour in the twentieth century has expanded from the two-dimensional world of the land and the surface of the sea, to include the ocean depths, the air, space, and most recently the 'cyberspace' environments. It also offers details analyses both of nuclear matters and of the realm of irregular violence.