Ireland, 1919: When Sinn Féin proclaimed Dáil Éireann to be the parliament of the independent Irish republic, London declared the new assembly illegal, and a vicious guerrilla war broke out between republican and crown forces. Michael Collins, intelligence chief of the Irish Republican Army, created an elite squad to assassinate British agents and undercover police. The so-called "Twelve Apostles" created violent mayhem, culminating in the events of Bloody Sunday in November 1920. Here Tim Pat Coogan tells the story of Collins's squad, and also examines the remarkable intelligence network which helped to bring the British government to the negotiating table.