U.S. President Franklin Roosevelt ordered his commander in the Philippines, General Douglas MacArthur, to formulate a Pacific defence plan with Australia in March 1942. Curtin agreed to place Australian forces under the command of General MacArthur, who became "Supreme Commander of the South West Pacific". Curtin had thus presided over a fundamental shift in Australia's foreign policy. MacArthur moved his headquarters to Melbourne in March 1942 and American troops began massing in Australia. In late May 1942, Japanese midget submarines sank an accommodation vessel in a daring raid on Sydney Harbour. On 8 June 1942, two Japanese submarines briefly shelled Sydney's eastern suburbs and the city of Newcastle.