| Regimental number | 600 |
| Place of birth | Goulburn, New South Wales |
| Religion | Church of England |
| Occupation | Carpenter |
| Marital status | Single |
| Age at embarkation | 23 |
| Height | 5' 9" |
| Weight | 148 lbs |
| Next of kin | Father, Elisha Marks, Marsden Street, Crookwell, New South Wales |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Holsworthy, New South Wales |
| Rank on enlistment | Private |
| Unit name | 6th Light Horse Regiment, A Squadron |
| AWM Embarkation Roll number | 10/11/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board Transport A29 Suevic on |
| Rank from Nominal Roll | Sergeant |
| Unit from Nominal Roll | 6th Light Horse Regiment |
| Fate | Returned to Australia |
| Miscellaneous information from cemetery records | Photo: Andrew Richardson |
| Discharge date | |
| Other details |
War service: Egypt, Gallipoli Commenced return to Australia on board HT 'Port Darwin', 15 November 1918; disembarked Sydney, 26 December 1918; discharged, Sydney, 24 February 1919. Medals: 1914-15 Star, British War Medal, Victory Medal |
| Miscellaneous details | Name does not appear on Embarkation Roll. |
| Date of death | |
| Age at death | 53 |
| Place of burial | Rookwood Necropolis, Sydney, New South Wales |
| Sources | NAA: B2455, MARKS William Sylvester |
