In April 1942, the Japanese Army and Navy together initiated Operation Mo, a joint plan to capture Port Moresby in New Guinea. Also part of the plan was a Navy operation to capture Tulagi in the southern Solomons. The objective of the operation was for the Japanese to extend their southern perimeter and to establish bases to support possible future advances to seize Nauru, Ocean Island, New Caledonia, Fiji, and Samoa and thereby cut the supply lines between Australia and the United States, with the goal of reducing or eliminating Australia as a threat to Japanese positions in the South Pacific. The Japanese Navy also proposed a future invasion of Australia, but the Army answered that it currently lacked enough troops to support such an operation.