For the United States, full involvement in World War II began and ended in the Pacific Ocean. Although the accepted grand strategy of the war was the defeat of Germany first, the sweep of Japanese victory in the weeks and months after Pearl Harbor impelled the United States to move as rapidly as it could to stem the enemy tide of conquest in the Pacific. Shocked as they were by the initial attack, the American people were also united in their determination to defeat Japan, and the Pacific war became peculiarly their own affair. In this great theater it was the United States that ran the war, and had the determining voice in answering questions of strategy and command as they arose. The natural environment made the prosecution of war in the Pacific of necessity an interservice effort, and any real account of it must, as this work does, take into full account the views and actions of the Navy as well as those of the Army and its Air Forces. These are the factors-a predominantly American theater of war covering nearly one-third the globe, and a joint conduct of war by land, sea, and air on the largest scale in American history-that make this volume on the Pacific war of particular significance today. It is the capstone of the eleven volumes published or being published in the Army's World War II series that deal with military operations in the Pacific area, and it is one that should command wide attention from the thoughtful public as well as the military reader in these days of global tension.