The Troubles in Ulster (1920–1922)

The Troubles in Ulster of the 1920s was a period of conflict in the Irish province of Ulster, from June 1920 until June 1922, during and after the Irish War of Independence and the partition of Ireland (and specifically of Ulster). In Ulster, it was mainly a communal conflict between unionists, who wanted to remain part of the United Kingdom, and nationalists, who backed Irish independence: the unionists were mainly Ulster Protestants and the nationalists were mainly Irish Catholics.

Source: Wikipedia — The Troubles in Ulster (1920–1922) (CC BY-SA 4.0)