"The war in the Pacific may be regarded as having four stages: (a) The defensive, when we were engaged almost exclusively in protecting our shores and our lines of communication from the encroachments of the enemy. (b) The defensive-offensive, during which, although our operations were chiefly defensive in character, we were able nevertheless to take certain defensive measures. (c) The offensive-defensive, covering the period immediately following our seizure of the initiative, but during which we still had to use a large part of our forces to defend our recent gains. (d) The offensive, which began when our advance bases were no longer seriously threatened and we became able to attack the enemy at places of our own choosing."