| Regimental number | 2800 |
| Place of birth | Balingup, Western Australia |
| Religion | Church of England |
| Occupation | Farmer |
| Address | Greenbushes, Western Australia |
| Marital status | Single |
| Age at embarkation | 28 |
| Next of kin | Father, Lindsay Richard Armstrong, Greenbushes, Western Australia |
| Enlistment date | 24 October 1916 |
| Date of enlistment from Nominal Roll | 19 October 1916 |
| Rank on enlistment | Private |
| Unit name | March 1917 Reinforcements |
| AWM Embarkation Roll number | 11/14/1 |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board HMAT A42 Boorara on 22 May 1917 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 4th Imperial Camel Corps |
| Fate | Returned to Australia 27 July 1919 |
| Family/military connections | Brother: 2799 Pte Roy Bunbury ARMSTRONG, 15th Light Horse Regiment, died of disease, 30 October 1918; 1534 Pte Bertram Foster ARMSTRONG, 10th Light Horse Regiment, returned to Australia, 10 July 1919. |