| Regimental number | 6770 |
| Place of birth | Lameroo, South Australia |
| Religion | Methodist |
| Occupation | Farmer |
| Address | Yacka, South Australia |
| Marital status | Single |
| Age at embarkation | 28 |
| Height | 5' 6.25" |
| Weight | 136 lbs |
| Next of kin | Mother, Mrs S Duffield, Yacka, South Australia |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Lameroo, 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 |
| Discharge date | |
| Family/military connections | Brother: 1136 Pte Ernest William DUFFIELD, 3rd Pioneer Bn, returned to Australia, 21 June 1919. |
| Other details |
War service: Western Front Commenced return to Australia on board HT 'Chemnitz', 7 July 1919; discharged (termination of period of enlistment), Adelaide, 3 October 1919. Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, DUFFIELD Joseph |