June 30

De Valera abolishes the oath of allegiance and withholds land annuities from the British Government

Irish Civil War begins

Irish Civil War begins with the shelling of the Four Courts in Dublin by Free State forces. The Irish Civil War was a conflict between supporters and opponents of the Anglo-Irish Treaty of December 6, 1921, which established the Irish Free State, precursor of todays Republic of Ireland. Opponents of the Treaty objected to the fact that it retained constitutional links between the United Kingdom and Ireland, and that the six counties of Northern Ireland would not be included in the Free State. The Civil War cost the lives of more than had died in the War of Independence that preceded it. It left Irish society deeply divided and its influence in Irish politics can still be seen to this day.

The Four Courts, Dublin, are abandoned by Anti-Treaty forces after a two-day bombardment

Start of trial for murder of Madeleine Smith who was eventually found Not Proven

Sir Samuel McCaughey, who is destined to become a sheep tycoon in Australia, is born near Ballymena, Co. Antrim

Rebels break camp, Needham sends Cavalry to pursue them

Ambush at Ballyellis: Rebel Victory Amid Retreat

Birth in Knockfin, Co. Laois of Arthur Jacob - noted oculist and Professor of Anatomy in the Royal College of Surgeons, Dublin

The fall of Athlone

During the Williamite War in Ireland, the strategic town of Athlone fell to forces loyal to William of Orange, despite fierce resistance from the Irish Jacobite defenders.