Department of Defence (1901–21)
|Formed||1 January 1901|
|Dissolved||21 December 1921|
|Jurisdiction||Commonwealth of Australia|
Information about the department's functions and/or government funding allocation could be found in the Administrative Arrangements Orders (AAOs).
In early AAOs, the department was responsible for Naval and Military defence and control of railway transport for defence.
The Secretaries of the Department were Muirhead Collins (1901–1910), Samuel Pethebridge (1910–18) and Thomas Trumble (1918‑21). Pethebridge was actually Acting in the Secretary role since 1906, he died in 1918 while in office as permanent departmental Secretary.
- CA 6: Department of Defence [I] (Central Administration), National Archives of Australia, retrieved 23 March 2014
- Mawer, Granville Allen (1988), "Pethebridge, Sir Samuel Augustus (1862–1918)", Australian Dictionary of Biography, Australian National University, archived from the original on 15 May 2013
- Casualty details: Pethebridge, Sir Samuel Augustus, Commonwealth War Graves Commission, archived from the original on 22 February 2014
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