|Place of birth||Clare, South Australia|
|Address||Clare, South Australia|
|Age at embarkation||21.4|
|Next of kin||Father, T P Gillen, Clare, South Australia|
|Previous military service||Served for 2 years in the Cadets. Previously rejected for AIF enlistment on account of height.|
|Date of enlistment from Nominal Roll|
|Place of enlistment||Clare, South Australia|
|Rank on enlistment||Private|
|Unit name||27th Battalion, 20th Reinforcement|
|AWM Embarkation Roll number||23/44/5|
|Embarkation details||Unit embarked from Melbourne, Victoria, on board HMAT A60 Aeneas on
|Rank from Nominal Roll||Private|
|Unit from Nominal Roll||48th Battalion|
|Fate||Returned to Australia
War service: Western Front
Embarked Melbourne, 30 January 1917; disembarked Devonport, England, 27 December 1917.
Proceeded overseas to France, 1 April 1918; taken on strength, 48th Bn, in the field, 6 April 1918.
Reported missing in action, 3 May 1918.
Now, 4 June 1918, reported prisoner of war in Germany.
Repatriated from Germany,arriving England 28 November 1918.
Commenced return to Australia on board HT 'Nevasa' 18 May 1919; disembarked Adelaide, 15 April 1919; discharged (termination of period of enlistment), 18 May 1919.Medals: British War Medal, Victory Medal
|Miscellaneous details||Second given name incorrectly entered on Embarkation Roll as Gerhard.|
|Sources||NAA: B2455, GILLEN Thomas Gerard|