| Regimental number | 2140 |
| Place of birth | Yorkshire, England |
| Religion | Church of England |
| Occupation | Timber cutter |
| Address | Bush Landing, Wellington Mills, Western Australia |
| Marital status | Single |
| Age at embarkation | 23 |
| Height | 5' 8" |
| Weight | 178 lbs |
| Next of kin | Father, Mr William Byas, Wellington Mills, Western Australia |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Blackboy Hill, Western Australia |
| Rank on enlistment | Private |
| Unit name | 51st Battalion, 4th Reinforcement |
| AWM Embarkation Roll number | 23/68/3 |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board HMAT A28 Miltiades on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 51st Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Other details |
War service: England Wounded in bombing practice, Codford, 23 November 1916 (right thigh and leg). Commenced return to Australia on board HT 'Miltiades', 4 May 1917; discharged (wounded), Perth, 27 December 1917. Medal: British War Medal Also served in World War II: Service No W67882. |
| Date of death | |
| Age at death | 64 |
| Place of burial | Karrakatta Cemetery and Crematorium, Perth, Western Australia |
| Sources | NAA: B2455, BYAS William |