|Place of birth||Adelaide, South Australia|
|Address||c/o Bagot, Shakes, Lewis, Adelaide, South Australia|
|Age at embarkation||23|
|Next of kin||Mother, Ailcie Kate MacMillan, Kalgoorlie Road, Largs, South Australia|
|Previous military service||Member for 3.5 years, Blythe Rifle Club.|
|Place of enlistment||Oaklands, South Australia|
|Rank on enlistment||Private|
|Unit name||9th Light Horse Regiment, 13th Reinforcement|
|AWM Embarkation Roll number||10/14/3|
|Embarkation details||Unit embarked from Melbourne, Victoria, on board HMAT A19 Afric on
|Rank from Nominal Roll||Sergeant|
|Unit from Nominal Roll||11th Light Horse Regiment|
|Fate||Returned to Australia
|Family/military connections||Brothers: 3438 Pte Ian Stewart MACMILLAN, 50th Bn, returned to Australia, 19 September 1918; 3439 Pte Douglas Gilchrist MACMILLAN MM, 50th Bn, returned to Australia, 12 May 1919.|
Originally due to embarked with 11th Light Horse Regiment, C Squadron, June 1915. Taken ill, and reassigned to 9th Light Horse Regiment.
War service: Egypt, Palestine
Taken on strength, 9th Light Horse Regiment, Heliopolis, 10 February 1916.
Rejoined 11th Light Horse Regiment, 22 February 1916.
Appointed Lance Sergeant, 19 June 1916; Temporary Sergeant, 10 July 1916; Sergeant, 27 October 1916.
Admitted to 1/2 East Riding Field Ambulance, 29 October 1916 (tonsilitis); discharged to duty, 21 November 1916.
Wounded in action, Palestine, 13 November 1917 (gun shot wound, neck), and admitted to 4th Light Horse Field Ambulance; transferred to 74th Casualty Clearing Station, 14 November 1917; to 44th Stationary Hospital, Kantara, 15 November 1917; to 14th Australian General Hospital, Abbassia, 16 November 1917. Listed as 'dangerously ill', 18 November 1917. Medical report, 31 December 1917: 'Complete paralysis from waist downwards came on immediately [after wounding].'
Commenced return to Australia on board HT 'Ulysses', 15 February 1918; disembarked Melbourne, 18 March 1918, for overland travel to Adelaide; discharged (medically unfit), 10 October 1918.
Total war service: 3 years 279 days (of which 2 years 67 days were abroad)
Died, 15th Australian General Hospital, Torrens Park, South Australia, 31 May 1919 (hypostatic pneumonia: due to war service).Medals: British War Medal, Victory Medal
|Date of death|