T H E D E F E N S E O F A U S T R A L I A
arate problems of defense at either extremity of the so-called Malay
barrier. Moreover, in the organization of defensive efforts in the
Pacific, as with those to be mounted in the China-Burma-India area,
the double threat of a Japanese advance from Rabaul by way of New
Guinea to Australia and from the same point by way of the Solomons
against the South Pacific line of communications presented its own
peculiar problems of organization and co-ordination. The Combined
Chiefs of Staff were in agreement that the Pacific should be primarily
an area of American responsibility, but among the Joint Chiefs the
question of Army and Navy responsibilities within this theater oc-
casioned some debate. A workable agreement was soon reached, how-
ever, on the basis of a proposal by President Roosevelt: there would
be a separate Southwest Pacific Area under the command of General
MacArthur; the remainder of the Pacific would be divided into the
Southeast Pacific and the Pacific Ocean areas, the latter to be sub-
divided under naval command into the North, Central, and South
Pacific. Forces in the adjoining South Pacific Area, which included
New Zealand and New Caledonia, thus would operate under the com-
mand of Adm. Chester W. Nimitz as commander in chief of the
Pacific Ocean Area, whose responsibilities included the maintenance
of a line of communications between the United States and the South-
west Pacific, the support of operations in that area, and preparation
for offensive action that might be separately or jointly ~ n d e r t a k e n . ~ ~
By the end of March, a directive for General MacArthur had been
drafted and submitted to the Allied governments concerned. Under
its provisions, the responsibilities of the new command were to check
the enemy's advance toward Australia; to exert all possible pressure
on the enemy; to protect land, sea, and air communications within the
theater; to support friendly forces of the Pacific Ocean Area; and to
make suitable preparations for a later assumption of the offensive."
In accordance with this directive, which meantime had undergone
only slight modification, General MacArthur assumed command of
the Southwest Pacific Area on 1 8 April 1942. The immediate prob-
lem in the direction of operations was to provide for a co-ordination
of effort between Australian and American forces and the few Dutch
units which had escaped from the Netherlands East Indies. Accord-
ingly, the staff of the new command was announced as follows: Gen.
Sir Thomas Blarney, Commander of Allied Land Forces; Lt. Gen.
George H. Brett, Commander of Allied Air Forces; Vice Adm.
4'9