Ernest Bernard Malley was an Irish republican and writer. After a sheltered upbringing, he witnessed and participated in the Easter Rising of 1916, an event that changed his outlook fundamentally. O'Malley soon joined the Irish Volunteers before leaving home in spring 1918 to become an IRA organiser and training officer during the Irish War of Independence against British rule in Ireland. In the later period of that conflict, he was appointed a divisional commander with the rank of general. Subsequently, O'Malley strongly opposed the Anglo-Irish Treaty and became assistant chief of staff of the Anti-Treaty IRA during the Irish Civil War of 1922–23.

The Irish Republican Army was an Irish republican revolutionary paramilitary organisation. The ancestor of many groups also known as the Irish Republican Army, and distinguished from them as the "Old IRA", it was descended from the Irish Volunteers, an organisation established on 25 November 1913 that staged the Easter Rising in April 1916. In 1919, the Irish Republic that had been proclaimed during the Easter Rising was formally established by an elected assembly, and the Irish Volunteers were recognised by Dáil Éireann as its legitimate army. Thereafter, the IRA waged a guerrilla campaign against the British occupation of Ireland in the 1919–1921 Irish War of Independence.