4th Military District (Australia)
The 4th Military District was an administrative district of the Australian Army. During the Second World War, the 4th Military District covered all of South Australia, with its headquarters at Adelaide. Around the start of the Second World War, the 4th Military District became part of Southern Command, along with the 3rd and 6th Military Districts in Victoria and Tasmania. This required legislative changes to the Defence Act, and did not come into effect until October 1939.Headquarters
- 4th Military District Headquarters – Adelaide
- Headquarters – Keswick
- 3rd Light Horse Regiment – Mt. Gambier
- 9th/23rd Light Horse Regiment – Clare
- 18th Light Horse Regiment – Unley
- Headquarters – Keswick
- 10th Battalion – Adelaide
- 27th Battalion – Keswick
- 43rd Battalion – Adelaide
- 48th Battalion – Adelaide
13th Field Brigade
- Headquarters – Adelaide
- 49th Field Battery – Adelaide
- 50th Field Battery – Prospect
- 113th Field Battery – Kilkenny
- 48th Field Battery – Keswick
Other units
- 10th Heavy Battery, RAA – Fort Largs
- 110th Heavy Battery, RAA – Fort Largs
- Detachment, RAE – Keswick
- 20th Heavy Battery, RAA – Fort Largs
- 120th Heavy Battery, RAA – Fort Largs
- 3rd Troop, 2nd Field Squadron, RAE – Keswick
- 3rd Field Company, RAE – Keswick
