The North-east
In the Government of Ireland Act 1920 (enacted in December 1920), the British government attempted to solve the conflict by creating two Home Rule parliaments in Ireland, Northern Ireland and Southern Ireland. While Dáil Éireann ignored this, deeming the Irish Republic to be already in existence, Unionists in the north-east accepted it and prepared to form their own government. In this part of Ireland, which was predominantly Protestant and Unionist, there was, as a result, a very different pattern of violence from the rest of the country. Whereas in the south and west, the conflict was between the IRA and British forces, in the north-east and particularly in Belfast, it often developed into a cycle of sectarian killings between Catholics, who were largely Nationalist, and Protestants, who were mostly Unionist.
Read more about this topic: Irish War Of Independence