Admittedly not a ground war, but that's not entirely true: > In total, there were 97 air attacks on northern Australia, though air reconnaissance was carried o

Admittedly not a ground war, but that's not entirely true: > In total, there were 97 air attacks on northern Australia, though air reconnaissance was carried out over the region by Axis Powers through much of 1944. https://en.wikipedia.org/wiki/Japanese_air_raids_on_Australia https://en.wikipedia.org/wiki/Japanese_air_raids_on_Australi... and > German and Japanese surface raiders and submarines operated in New Zealand waters on several occasions in 1940, 1941, 1942, 1943 and 1945, sinking a total of four ships while Japanese reconnaissance aircraft flew over Auckland and Wellington preparing for a projected Japanese invasion of New Zealand. https://en.wikipedia.org/wiki/Military_history_of_New_Zealand_during_World_War_II https://en.wikipedia.org/wiki/Military_history_of_New_Zealan...