Between 1916 and 1923, Ireland experienced rebellion and mass mobilization, guerrilla and civil war, partition and ethnic conflict, and the transfer of power from British to Irish governments. The essays in The I.R.A. at War propose a new history of this Irish revolution: one that encompasses the whole of the island as well as Britain, all of the violence and its consequences, and the entire period from the Easter Rising to the end of the Civil War.