| Date of enlistment | 7th July 1915 |
| Rank at enlistment | Private |
| Company | |
| Significant events while with the AIF | Wounded in Action – Pozieres |
Summary of Private Hennessy’s WW1 service record, located in the National Archives of Australia. Full details are available online, NAA Series B2455
| Date | Location | Event |
| 22nd June 1917 | Australia | Discharged – medically unfit |
| 12th May 1917 | Australia | Disembarked Bultana |
| 17th March 1917 | England | Return to Australia on HT Bultana |
| 13th February 1917 | England | Marched in to No.2 Command Depot Weymouth |
| 17th January 1917 | England | From hospital to furlough |
| 8th December 1916 | England | Transferred to 3rd Auxiliary Hospital Dartford |
| 10th August 1916 | England | Admitted to Wharncliffe War Hospital Sheffield – shell wound left leg severe (fracture and calf damage) |
| 8th August 1916 | France | Embarked for England on HS Cambria from Boulogne |
| 7th August 1916 | France | Admitted to 8th Stationary Hospital |
| 5th August 1916 | France | Wounded in Action – Gunshot Wound leg (severe) |
| 5th July 1916 | France | Absent without leave in the field. Award 12 days FP#2 and total forfeiture of 14 days pay |
| 26th March 1916 | France | Disembarked Marseille |
| 19th March 1916 | Egypt | Proceeded to join British Expeditionary Force from Alexandria on the Llandovery Castle |
| 8th January 1916 | Egypt | Taken on Strength, Tel-el-Kabir |
| 25th October 1915 | Egypt | Disembarked Alexandria |
| 29th September 1915 | Australia | Departed Melbourne on RMS Osterley |
| 28th September 1915 | Australia | Re-assigned to 5th Reinforcements 22nd Battalion |
| 4th August 1915 | Australia | Assigned to 6th Reinforcements |
| 21st July 1915 | Australia | Marched into 63 Company Depot Broadmeadows |

FIRST WORLD WAR TIMELINE