In 1921, following the demobilisation of the AIF, Australia's part-time military forces were reorganised to replicate the numerical designations of the AIF. At this time, the 4th Division name was revived and was assigned to a Citizen Military Forces (reserve) formation headquartered in Melbourne, and assigned to the 3rd Military District. This formation consisted of three brigades spread across two states: the 2nd and 6th were based in Victoria, while the 3rd was based in South Australia. The division's commander upon re-establishment was Major General William Glasgow.