| Regimental number | 6339 |
| Date of birth | |
| Place of birth | Woodville, South Australia |
| Religion | Church of England |
| Occupation | Labourer |
| Address | Woodville, South Australia |
| Marital status | Single |
| Age at embarkation | 21 |
| Height | 5' 3.75" |
| Weight | 127 lbs |
| Next of kin | Mother, Mrs Mary Ellen Underwood, Port Road, Woodville, South Australia |
| Previous military service | Served for 1.5 years in the Citizen Military Forces. |
| Enlistment date | |
| Place of enlistment | Adelaide, South Australia |
| Rank on enlistment | Private |
| Unit name | 10th Battalion, 20th Reinforcement |
| AWM Embarkation Roll number | 23/27/4 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A68 Anchises on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 27th Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Other details |
War service: Western Front Commenced return to Australia on board HT 'Khyber', 31 March 1919; discharged Medically unfit: gun shot wound, left leg), Adelaide, 20 July 1919. Medals: British War Medal, Victory Medal Also served in World War II: Service No S67834. |
| Sources | NAA: B2455, UNDERWOOD William Henry |