At the age of 20, O’Hanlon is killed on January 1, 1957, along with Seán South while taking part in an attack on the Royal Ulster Constabulary barracks in Brookeborough, County Fermanagh, during the border campaign. Several other IRA members are wounded in the botched attack. The IRA flees the scene in a dumper truck. They abandon it near the border. They leave South and O’Hanlon, both then unconscious, in a cow byre, and crossed into the Republic of Ireland on foot for help for their comrades. The wounded IRA men are treated as “car crash victims” by sympathetic staff in the Mater Misericordiae Hospital in Dublin.
O’Hanlon’s mother remains firmly committed to the IRA and is hurt by the suggestion that there was an alternative to IRA activity or that her son was anything other than an Irish hero.
A marble monument now stands at the spot where South and O’Hanlon lost their lives. An annual lecture has been held in memory of O’Hanlon since 1982, and approximately 500 people attended a 50th commemoration of the men’s deaths in January 2007 in Limerick.
In 1971, a monument is unveiled to O’Hanlon in his hometown on a hill overlooking the Clones Road on which he had made his last journey home. A Gaelic football team is founded in Monaghan in 2003 and called the Fergal O’Hanlons.
Parke joins the British Army Medical Services (AMS) in February 1881 as a surgeon, first serving in Egypt during the final stages of the ʻUrabi revolt in 1882. As a senior medical officer at a field hospital near Cairo, he is responsible for treating battle casualties as well as the deadly cholera epidemic that afflicts 20% of British troops stationed there. In late 1883, he returns to Ireland, where he is stationed at Dundalk with the 16th The Queen’s Lancers. He arrives in Egypt once again in 1884 as a part of the Nile Expedition sent in relief of General Charles Gordon, who is besieged in Khartoum by Mahdists in neighbouring Sudan. The expedition arrives too late, and Gordon is killed. Parke later negatively recounts this experience in an 1892 journal article titled How General Gordon Was Really Lost. Following the expedition, he spends the next few years stationed in Alexandria, where he notably introduces fox hunting to Egypt, becoming master of the Alexandria Hunt Club.
In January 1887, while in Alexandria, Parke is invited by Edmund Musgrave Barttelot to accompany him on the Emin Pasha Relief Expedition. The expedition is led by Henry Morton Stanley, and journeys through the African wilderness in relief of Emin Pasha, an Egyptian administrator who had been cut off by Mahdist forces following the Siege of Khartoum. He is initially rejected by Stanley upon his arrival in Alexandria but is invited by telegram a day later to join the expedition in Cairo. On February 25, 1887, the expedition sets off from Zanzibar for the Congo.
The expedition lasts for three years and faces great difficulty, with the expedition of 812 men suffering from poor logistical planning and leadership. The rainforest is much larger than Stanley expected, leading much of the party to face starvation and disease. The expedition has to resort to looting native villages for food, escalating the conflict between the two groups. Parke, for his part, saves the lives of many in the party, including Stanley, who suffers from acute abdominal pain and a bout of sepsis. Stanley describes Parke’s care as “ever striving, patient, cheerful and gentle…most assiduous in his application to my needs, and gentle as a woman in his ministrations.” Parke also treats Arthur Jephson for fever, and nurses Robert H. Nelson through starvation. Furthermore, after a conflict with the natives, he has to save William Grant Stairs by orally sucking the poison out of an arrow wound.
During the expedition, Parke purchases from an Arab slaver a Mangbetu Pigmy girl, who serves as his nurse and servant for over a year.
After returning to Ireland, Parke receives an Honorary Fellowship of the Royal College of Surgeons in Ireland and is awarded gold medals from the British Medical Association (BMA) and the Royal Geographical Society. He publishes several books, including My Personal Experiences in Equatorial Africa (1891) and A Guide to Health in Africa.