The amount of activity undertaken by the U.S. military in World War II is truly staggering to contemplate. Germany had to fight on both eastern and western fronts, but America fought on eastern and western fronts each separated by thousands of miles of ocean from the homeland. This meant mastery of the seas was imperative. Morison managed to talk President Roosevelt into giving him, as a working historian, a naval officer’s commission and assignment to various warships throughout the conflict. His book does a thorough job sketching out the scope and drama of U.S. naval operations in the war, and since he was literally on the scene at the time, he adds a welcome journalistic touch from time to time. For instance, he tells us that nobody in the service called Admiral William Halsey “Bull” Halsey. It was just Bill. Now you know.