With the demise of the ``evil empire'' of the Soviet Union, many are questioning the necessity, indeed desirability, of navies. In this historical study of navies in war, Gray (president, National Inst. for Public Policy) argues that superior sea power generates a strategic leverage that enables countries to win wars. Using case studies beginning with the Persians and Greeks in 480 B.C. and ending with the demise of the Cold War, he arrives at a number of conclusions supporting the strategic use of sea power. These conclusions are buttressed by extensive documentation and bibliography that provide a virtual review of the important works in maritime history. In scope and detail impressive as the works of naval historian Alfred Thayer Mahan, this book will find a ready audience among those interested in the future of world sea power. For academic libraries and specialists in the field.-- Harold N. Boyer, Marple P.L., Broomall, Pa.