The Irish Civil War begins with the shelling of the Four Courts in Dublin by Free State forces.

The Irish Civil War was a conflict that followed the Irish War of Independence and accompanied the establishment of the Irish Free State, an entity independent from the United Kingdom but within the British Empire.

The Four Courts is Ireland's most prominent courts building, located on Inns Quay in Dublin. The Four Courts is the principal seat of the Supreme Court, the Court of Appeal, the High Court and the Dublin Circuit Court. Until 2010 the building also housed the Central Criminal Court; this is now located in the Criminal Courts of Justice building.

Dublin is the capital and largest city of Ireland. Situated on Dublin Bay at the mouth of the River Liffey, it is in the province of Leinster, and is bordered on the south by the Dublin Mountains, part of the Wicklow Mountains range. Dublin is the largest city by population on the island of Ireland; at the 2022 census, the city council area had a population of 592,713, while the city including suburbs had a population of 1,263,219, County Dublin had a population of 1,501,500. Various definitions of a metropolitan Greater Dublin Area exist.

The Irish Free State, also known by its Irish name Saorstát Éireann, was a state established in December 1922 under the Anglo-Irish Treaty of December 1921. The treaty ended the three-year Irish War of Independence between the forces of the Irish Republic – the Irish Republican Army (IRA) – and British Crown forces.