During the Irish War of Independence , Intelligence Corps operatives were used in an unsuccessful battle to defeat the Irish Republican Army . The Cairo Gang were overwhelmingly Intelligence Corps operatives . On Bloody Sunday , 1920 , twelve of these agents were assassinated at their lodgings by Michael Collins ' Squad . Due to this and similar failures , the Intelligence Corps was disbanded in 1929
Bloody Sunday
Bloody Sunday (1920)
Intelligence Corps (United Kingdom)