The Generals of WWII
Generals from Great Britain
O'Hanlon, Oriel John O'Brian
Brigadier
* 13th of September 1888
† 4th of January 1963
Promotions
| 1938-03-01 | Lieutenant-Colonel |
| 1941-06-04 | Local Colonel |
| 1941-12-07 | Acting Colonel |
| 1942-03-14 | Acting Brigadier |
| 1942-06-07 | Temporary Colonel |
| 1942-06-17 | Reverted to Lieutenant-Colonel |
| 1942-10-09 | Temporary Colonel |
| 1947-07-24 | Reverted to Lieutenant-Colonel |
| 1948-04-06 | Granted the Honorary rank of Colonel |
Service
| 1938-XX-XX | – | 1939-XX-XX | Dermatology Specialist Queen Alexandra Military Hospital Millbank |
| 1939-12-07 | – | 1941-03-13 | Senior Medical Officer, Ceylon Command |
| 1941-03-14 | – | 1942-06-17 | Deputy Director of Medical Services, Ceylon Command |
| 1942-XX-XX | – | 1943-XX-XX | Commanding Officer Military Hospital Shenley |
| 1944-XX-XX | – | 1945-XX-XX | Commanding Officer 78th General Hospital |
| 1945-XX-XX | – | 1947-XX-XX | Commanding Officer 19th General Hospital |
| 1947-03-XX | – | 1947-07-XX | Commanding Officer 231st Military Prisoner of War Hospital |
| 1947-XX-XX | President Standing Medical Board London District | ||
| 1948-04-06 | Retired |