| Regimental number | 3525 |
| Place of birth | Blanchetown, South Australia |
| Religion | Methodist |
| Occupation | Farmer |
| Address | Blanchetown, South Australia |
| Marital status | Single |
| Age at embarkation | 20 |
| Height | 5' 10.25" |
| Weight | 136 lbs |
| Next of kin | Father, Walter William Castle, Blanchetown, South Australia |
| Previous military service | Nil (exempt area under Compulsory Military Training scheme) |
| Enlistment date | |
| Place of enlistment | Adelaide, South Australia |
| Rank on enlistment | Private |
| Unit name | 32nd Battalion, 8th Reinforcement |
| AWM Embarkation Roll number | 23/49/2 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A70 Ballarat on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 32nd Battalion |
| Fate | Returned to Australia |
| Discharge date | |
| Family/military connections | Brother: 3526 Pte Leslie Gordon CASTLE, 32nd Bn, killed in action, 20 June 1918. |
| Other details |
War service: Western Front Wounded in action, 25 June 1918 (gun shot wound, right arm). Commenced return to Australia on board HT 'Suevic', 20 November 1918; discharged (medically unfit), 6 April 1919. Medals: British War Medal, Victory Medal |
| Date of death | |
| Age at death | 49 |
| Place of burial | AIF Cemetery, West Terrace, Adelaide, South Australia |
| Sources | NAA: B2455, CASTLE George William |