What was the effect of the invasion of New Guinea on Australia?

The invasion of Papua New Guinea was seen as a very real threat to Australia's security, as defence of PNG and Port Moresby was critical to victory in the south Pacific. Had Port Moresby fallen, it would have left northern Australia more vulnerable to attack. Singapore had already fallen, Rabaul (PNG) had already fallen, and the Japanese troops were getting much closer. Over the period of a year or more, Darwin and northern parts of Australia experienced periodic bombings from the Japanese.

In May 1942, a Japanese invasion fleet departed Rabaul for Port Moresby, and the Battle of the Coral Sea began. It was a very real threat which was only turned back by the US aircraft leaving from carriers. After being turned back by the US, the Japanese then turned their attention to an attack over the Owen Stanley Range via the Kokoda Track, which linked the northern and southern coasts of Papua New Guinea. Thanks to the Papua New Guinean natives assisting the Australians and the US troops, the Japanese were turned back, having to retreat to bases at Buna, Gona and Sanananda, where they were eventually defeated.
The invasion of Papua New Guinea was seen as a very real threat to Australia's security, as defence of PNG and Port Moresby was critical to victory in the south Pacific. Had Port Moresby fallen, it would have left northern Australia more vulnerable to attack. Singapore had already fallen, Rabaul (PNG) had already fallen, and the Japanese troops were getting much closer. Over the period of a year or more, Darwin and northern parts of Australia experienced periodic bombings from the Japanese.

In May 1942, a Japanese invasion fleet departed Rabaul for Port Moresby, and the Battle of the Coral Sea began. It was a very real threat which was only turned back by the US aircraft leaving from carriers. After being turned back by the US, the Japanese then turned their attention to an attack over the Owen Stanley Range via the Kokoda Track, which linked the northern and southern coasts of Papua New Guinea. Thanks to the Papua New Guinean natives assisting the Australians and the US troops, the Japanese were turned back, having to retreat to bases at Buna, Gona and Sanananda, where they were eventually defeated.