| Regimental number | 20120 |
| Date of birth | |
| Place of birth | Mulgunnia, New South Wales |
| Religion | Church of England |
| Occupation | Commission agent |
| Address | Canowindra, New South Wales |
| Marital status | Single |
| Age at embarkation | 21 |
| Height | 5' 7.5" |
| Weight | 148 lbs |
| Next of kin | Father, B H Birchill, 'Upperton Villa', Canowindra, New South Wales |
| Previous military service | Nil (previously rejected for enlistment on account of eyesight) |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | Army Medical Corps, General Reinforcements |
| AWM Embarkation Roll number | 26/99/2 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A36 Boonah on |
| Fate | Ship recalled owing to cessation of hostilities |
| Discharge date | |
| Family/military connections | Brother: 3647 Pte Charles Alfred Hern BIRCHILL, 7th Light Horse Regiment, retuirned to Australia, 17 July 1919. |
| Other details |
Ship recalled; disembarked Adelaide approximately 20 December 1918. Discharged (termination of period of enlistment), Sydney, 2 February 1919. Medal: British War Medal |
| Sources | NAA: B2455, BIRCHILL Basil Herne Harper |