| Regimental number | 3334 |
| Place of birth | Mount Morgan Queensland |
| Religion | Roman Catholic |
| Occupation | Blacksmith |
| Address | West Rockhampton, Queensland |
| Marital status | Single |
| Age at embarkation | 18 |
| Next of kin | Father, Patrick Joseph McMahon, Kunwarara via Rockhampton, Queensland |
| Enlistment date | 12 March 1917 |
| Rank on enlistment | Private |
| Unit name | 41st Battalion, 8th Reinforcement |
| AWM Embarkation Roll number | 23/58/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A20 Hororata on 14 June 1917 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 41st Battalion |
| Fate | Returned to Australia 20 December 1918 |
| Date of death | 9 July 1977 |
| Place of burial | Rockhampton Crematorium |
