At the very beginning of the Easter Rising of 1916 a force of twenty-five Irish Citizen Army members were able to seize the entrance and guard-room of the Castle , before reinforcements for the small garrison arrived . During the Anglo-Irish War the Castle was the nerve centre of the British effort against Irish separatism . On the night of Bloody Sunday in 1920 , three Irish Republican Army members Dick McKee , Conor Clune and Peadar Clancy , were tortured and killed there
Bloody Sunday
Bloody Sunday (1920)
Dublin Castle