Destruction of Irish country houses (1919–1923) April 1921, north Cork IRA leader, Liam Lynch, enraged by the destruction of several houses in reprisal for an IRA ambush declared, 'six big houses and castles of their friends, the Imperialists will go up for this.'" At least 76 country mansions were destroyed in the War of Independence; 30 "Big Houses" were burned in 1920 and another 46 in the first half of 1921, mostly in the conflict's Munster heartland, i.e. counties Cork, Kerry, Tipperary, Clare and Limerick. Historian James S. Donnelly stated in a study of the burning of over 50 country mansions in County Cork in 1919–21
Irish migration to Great Britain and domestic labour. The extent of the Irish contribution to Britain's construction industry in the 20th century may be gauged from Sir William MacAlpine's 1998 assertion that the contribution of the Irish to the success of his industry had been 'immeasurable'. Ireland's population fell from more than 8 million to just 6.5 million between 1841 and 1851. A century later it had dropped to 4.3 million. By the late 19th century, emigration was heaviest from Ireland's most rural southern and western counties. Cork, Kerry, Galway, Mayo, Sligo, Tipperary and Limerick alone provided nearly half of Ireland's emigrants. Some of this