Port Moresby in New Guinea was vital to the defense of Australia. Whoever controlled Port Moresby would control the region and determine the outcome of battles. The Japanese strategic goal was to take Port Moresby to enable bombing of northern Australia. The Australians strategically fought to prevent this. Through costly battles in September, the Australians pushed the Japanese back towards their starting point. By mid-November, the Japanese abandoned their plan to take Port Moresby.