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 (1903), and did not come into effect until October 1939.
Units during Second World War Headquarters 4th Military District Headquarters – Adelaide
6th Cavalry Brigade Headquarters – Keswick 3rd Light Horse Regiment (The South Australian Mounted Rifles) – Mt. Gambier 9th/23rd Light Horse Regiment (Flinders Light Horse/Barossa Light Horse) – Clare 18th Light Horse (Machine Gun) Regiment (The Adelaide Lancers) – Unley
3rd Infantry Brigade Headquarters – Keswick 10th Battalion (The Adelaide Rifles) – Adelaide 27th Battalion (The South Australian Scottish Regiment) – Keswick 43rd Battalion (The Hindmarsh Regiment) – Adelaide 48th Battalion (The Torrens Regiment) – Adelaide
13th Field Brigade Headquarters – Adelaide 49th Field Battery – Adelaide 50th Field Battery – Prospect 113th (Heavy) Field Battery – Kilkenny 48th Field Battery (Attached) – Keswick
Other units 10th Heavy Battery, RAA (PF) – Fort Largs 110th Heavy Battery, RAA (M) – Fort Largs Detachment, RAE (PF) – Keswick 20th Heavy Battery, RAA (PF) – Fort Largs 120th Heavy Battery, RAA (M) – Fort Largs 3rd Troop, 2nd Field Squadron, RAE – Keswick 3rd Field Company, RAE – Keswick
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