| Regimental number | 18845 |
| Place of birth | Windsor New South Wales |
| Religion | Church of England |
| Occupation | Clerk |
| Address | Thompson Square, Windsor, New South Wales |
| Marital status | Single |
| Age at embarkation | 35 |
| Next of kin | Father, Dr J Callaghan, Thompson Square, Windsor, New South Wales |
| Enlistment date | |
| Rank on enlistment | Gunner |
| Unit name | Field Artillery Brigade 7, Battery 27 |
| AWM Embarkation Roll number | 13/35/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A8 Argyllshire on |
| Rank from Nominal Roll | Gunner |
| Unit from Nominal Roll | 7th Field Artillery Brigade |
| Recommendations (Medals and Awards) |
Mention in Despatches Awarded, and promulgated, 'London Gazette' No. 29455 (28 January 1916); 'Commonwealth Gazette' No. 44 (6 April 1916). |
| Fate | Returned to Australia |
| Family/military connections | Brother: 18844 Gunner Reginald CALLAGHAN, 7th Field Artillery Brigade, returned to Australia, 16 November 1918. |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |