| Regimental number | 2872 |
| Place of birth | Dalby, Queensland |
| School | State School, Dalby, Queensland |
| Religion | Roman Catholic |
| Occupation | Station hand |
| Address | Cattle Dip, via Dalby, Queensland |
| Marital status | Single |
| Age at embarkation | 19 |
| Height | 5' 8" |
| Weight | 122 lbs |
| Next of kin | Father, Fred Callaghan, Cattle Dip, via Dalby, Queensland |
| Previous military service | Served for 6 months in Cadets |
| Enlistment date | |
| Place of enlistment | Toowoomba, Queensland |
| Rank on enlistment | Private |
| Unit name | 2nd Light Horse Regiment, 20th Reinforcement |
| AWM Embarkation Roll number | 10/7/4 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board RMS Malwa on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 2nd Light Horse Regiment |
| Fate | Killed in Action |
| Place of death or wounding | Gaza, Palestine |
| Age at death | 20 |
| Place of burial | No known grave |
| Commemoration details | Jerusalem Memorial, Palestine |
| Panel number, Roll of Honour, Australian War Memorial | 3 |
| Miscellaneous information from cemetery records | Parents: Frederick and Mary CALLAGHAN, Jimbour Road, Dalby, Queensland |
| Family/military connections | Brother: 6958 Pte Ernest William CALLAGHAN, 41st Bn, returned to Australia, 12 June 1919. |
| Other details |
War service: Egypt, Palestine Taken on strength, Isolation Camp, Moascar, 25 August 1916. Taken on strength, 1st Light Horse Training Regiment, 25 September 1916; marched out to Isolation Camp, 26 September 1916. Taken on strength, 1st Light Horse Training Regiment, 10 October 1916. Transferred to 2nd Light Horse Regiment, 5 November 1916; taken on strength, 13 November 1916. [no details of service between 13 November 1916 and 19 April 1917]. Killed in action, Palestine, 19 April 1917. MBV MBV |
| Sources | NAA: B2455, CALLAGHAN Thomas |