| Regimental number | 266 |
| Place of birth | Sydney, New South Wales |
| Religion | Church of England |
| Occupation | Mill hand |
| Address | c/- Mrs E Deacon, "Cambewarra", John Street, Petersham, Sydney, New South Wales |
| Marital status | Single |
| Age at embarkation | 30 |
| Next of kin | Mother, Mrs Helen Deacon, Petersham, Sydney, New South Wales |
| Enlistment date | 2 March 1915 |
| Date of enlistment from Nominal Roll | 3 March 1915 |
| Rank on enlistment | Private |
| Unit name | 28th Battalion, B Company |
| AWM Embarkation Roll number | 23/45/1 |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board HMAT A11 Ascanius on 29 June 1915 |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board HMAT A36 Thirty Six on 12 July 1916 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 28th Battalion |
| Fate | Returned to Australia 4 December 1915 |
| Miscellaneous details (Nominal Roll) | *Spelt Horace Sidney Deacon on NR |
| Other details | Son of William Edward Deacon |
