John Keegan's new book applies to maritime warfare the technique he put to such dazzling effect in his classic of war on land, The Face of Battle. His analysis concentrates on four key battles - Trafalgar, Jutland, Midway and the Battle of the Atlantic. The result not only illustrates the development of naval warfare through the sailing warship, the battleship, the aircraft carrier and the submarine, thereby giving a panoramic view, but takes the reader into the heart of the fighting, reminding us that the price of battle, whether on sea or land, is measuring in men's lives.