Today marks the 66th anniversary of the first Japanese attack on mainland Australia, the first of over 60 more to come. More bombs were dropped on Darwin than on Pearl Harbour, although most people don't know that. It was attacked a further 62 times, and the Japanese also attacked by air several other towns and military targets. A total of 111 separate Japanese air attacks on Australia took place until the last in November 1943, an almost two year campaign by the Japanese. The IJN carriers Akagi, Kaga, Hiryū and Sōryū launched 188 aircraft for the initial raid, with severe casualties and damage, both to shore locations and ships sunk.
The First Darwin Attack:
Bombing of Darwin (February 1942) - Wikipedia, the free encyclopedia
History of Japanese Air Campaign Against Australia:
Air raids on Australia, 1942-43 - Wikipedia, the free encyclopedia
The Darwin raid was followed by an IJN attack on Sydney Harbour on 31.5.42:
Attack on Sydney Harbour - Wikipedia, the free encyclopedia
Australia Attacked:
Australia Attacked; all the details
This last site is an excellent one, not just for it's Australian content, it has a fantastically detailed database covering all combatants and all aspects of military history - check it out.