During The Troubles in Ulster (1920–1922), 15 Irish Nationalists are killed in Belfast in one day.

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. In Ulster, it was mainly a communal conflict between unionists, who wanted to remain part of the…