 He joined the Irish Volunteers in 1913, then on the outbreak of World War I in 1914 enlisted for service in the British Army, with which he was killed in action on the Western Front in the Autumn of 1916.He was a much admired old comrade of James Joyce, who considered him to be his best friend in Ireland, as well as the likes of Francis Sheehy-Skeffington, Oliver St. John Gogarty and Robert Wilson Lynd.He was one of the leading figures of the generation who at the turn of the twentieth century gave new intellectual life to Irish party politics, and to the constitutional movement towards All-Ireland Home Rule.