[2] The film begins with a prologue, 'The Warning', showing a Sydney horse race, then a football match in front of thousands of spectators.
"[4] The movie was written by John Barr and C. A. Jeffries, two journalists from the magazine The Bulletin, and sought to exploit Australia's fear of the Yellow Peril.
Filming was done with the assistance of the Australian Defence Department and took over a year to complete, including model work to depict the burning of Sydney.
[5][6] The cast includes early Australian aviator William Ewart Hart, who made the first cross-country flight in New South Wales, and later tenor Alfred O'Shea.
[7] An article in Everyone's later wrote that in the film, Longford's "attacking forces for obvious reasons were Celestials, and he commandeered the staff of a Chinese cabinet maker whilst engaged on the war scenes."