1914:Australian troops landed in New Guinea, the first force ever to leave Australia on Australian ships, commanded by Australian officers. This was Australia's first major action in World War I. At dawn on 11 September 1914, the ANMEF landed at Rabaul. German New Guinea was captured six days later without resistance, and the following month the neighboring islands of the Bismarck Archipelago were captured.


1928:Charles Kingsford Smith completed the first trans-Tasman flight at Wigram Airport. The plane landed in Christchurch and was given a warm welcome. About 30,000 people came to Wigram, including many public school students and civil servants. The event was also broadcast live on radio.


1978:Queen Elizabeth II of Australia awarded the Northern Territory the national coat of arms. It is the only Australian state or territory to incorporate floral, animal and bird emblems, while also reflecting the Aboriginal heritage of the Northern Territory.


2022:Australian Prime Minister Anthony Albanese has announced that Australians will receive a one-off public holiday as a national day of mourning to mark the death of Queen Elizabeth II. Thursday 22 September will be a national public holiday to allow people to pay their respects to the death of Queen Elizabeth, which coincided with the Queen's memorial service.


2022:David Hurley, Governor-General of Australia, proclaimed King Charles III to the throne during a ceremony at Parliament House in Canberra. Hundreds of people gathered on the Capitol forecourt and around the streets to watch the official ceremony. Ceremonies outside the Capitol included the playing of the national anthem and a welcome ceremony. After proclaiming Charles III king, there was a performance of"God Save the King" , followed by an Aboriginal spiritual dance and a 21-gun salute.