Packed with violence, political drama and social and cultural upheaval, the years 1913-1923 saw the emergence in Ireland of the Ulster Volunteer Force to resist Irish home rule and in response, the Irish Volunteers, who would later evolve into the IRA. World War One, the rise of Sinn Féin, intense Ulster unionism and conflict with Britain culminated in the Irish war of Independence, which ended with a compromise Treaty with Britain and then the enmities and drama of the Irish Civil War.