The first real air raid on Australia was against Darwin on 19 February 1942. I don't know when the first fake air raid on Australia was, but there was one against Melbourne on 14 October 1929:
An aerial attack was made on Melbourne to-day by a group of seagull [sic] machines, which had been sent up from the aircraft carrier, Albatross. Overcoming opposition from a fleet of land 'planes, the raiders dropped several bombs, scoring vital hits, according to the attackers. The attack was part of air force exercises. The Albatross was outside the Heads, when the Seagull machines were depatched [sic], and three of these machines managed to reach the city, in spite of the efforts of 'planes from Point Cook aerodrome.
A more detailed (but harder to read) account reveals that that Albatross, representing a 'hostile seaplane carrier' outside Port Phillip Heads, launched a force of six Supermarine Seagulls and one Wackett Widgeon, which was sighted by a defending Supermarine Southampton off Brighton. The attackers were intercepted by aircraft from Point Cook, but
three broke through and flew over Melbourne from the direction of Port Melbourne, circling over Victoria Barracks and turning back to sea from a point presumably above Princes Bridge.
A later newspaper report suggested that 'Under war conditions, the city would have suffered many casualties'. The official result of the exercise does not seem to have been published in the press, but it seems like it might have been fudged in favour of the defenders:
Bringing 1929 to a close, Albatross took part in a combined RAN-RAAF exercise in Port Phillip Bay in October. The point of this exercise was to test the carrier in making an air raid, along with assessing the efficiency of RAAF cooperation with Navy in repelling a seaborne air attack. According to reports on the exercise, the defence against the carrier attack was only successful because scouting Southamptons set off from Point Cook, without orders, some time before warning was actually received of approaching enemy aircraft. In fact, as noted by the CO of No. 1 FTS, aerial patrols had failed to sight the approaching naval force. Strikes had then been mounted against these ships off Frankston, involving Moths (representing single-seat fighters) and Wapitis. One RAAF pilot whose part in the scheme entailed simply flying over the Melbourne dock area probably summed up the feelings of many of those involved when he noted in his log-book that the exercise was 'A farce—nothing done or to see'..
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