In the first two decades of the Cold War, Australia fought in three conflicts and prepared to fight in a possible wider conflagration in Southeast Asia and the Pacific. In Korea, Malaya and Borneo, Australian forces encountered new types of warfare, integrated new equipment and ideas, and were part of the longest continual overseas deployments in Australia’s history. Working closely with its allies, Australia also trained for a large conventional war in Southeast Asia, while a significant percentage of the defence force guarded the Papua New Guinea–Indonesian border.