| Regimental number | 3687 |
| Date of birth | |
| Place of birth | Glasgow, Scotland |
| Religion | Church of England |
| Occupation | Clerk |
| Address | Water Street, Lidcombe, New South Wales |
| Marital status | Single |
| Age at embarkation | 18.10 |
| Height | 5' 7" |
| Weight | 137 lbs |
| Next of kin | Father, S. Yarroll, 'Muriel', Water Street, Lidcombe, New South Wales |
| Previous military service | Served in the Cadets for 4 years, 1.25 years in the Militia. |
| Enlistment date | |
| Place of enlistment | Holsworthy, New South wales |
| Rank on enlistment | Private |
| Unit name | 18th Battalion, 8th Reinforcement |
| AWM Embarkation Roll number | 23/35/2 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A60 Aeneas on |
| Rank from Nominal Roll | Corporal |
| Unit from Nominal Roll | 18th Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Family/military connections | Brother: 3688 Pte Robert William YARROLL, 18th Bn, returned to Australia, 27 April 1919. |
| Other details |
War service: Egypt, Western Front Wounded in action, 4 August 1918. Commenced return to Australia from Plymouth on board HT 'Miltiades', 19 June 1919; discharged (termination of period of enlistment), Sydney, 29 October 1919. Medals: British War Medal, Victory Medal Also served in World War II: Service No N65528. |
| Sources | NAA: B2455, YARROLL Sydney Ernest |