This book, first published in 1990, presents a fundamental reassessment of maritime strategy. It analyses the lessons of twentieth-century naval warfare and examines in detail the changing face of naval warfare, both in terms of the weapons used and the platforms from which they are launched and controlled. It looks at the evolving uses of the seas, both economic and military, and sets sea power against the developing world environment, political, legal and economic, discussing those factors that stimulate nations to exert power at sea and those that limit their naval capabilities. It also develops a theoretical framework for future thinking about maritime strategy and forces, revises and updates Mahan’s classical analysis of the foundations of sea power, and discusses thinking about naval tasks.