Michael Collins was an Irish revolutionary leader, Minister for Finance, Director of Information, and Teachta Dála (TD) for Cork South in the First Dáil of 1919, Adjutant General, Director of Intelligence, and Director of Organisation and Arms Procurement for the IRA, President of the Irish Republican Brotherhood from November 1920 until his death, and member of the Irish delegation during the Anglo-Irish Treaty negotiations. Subsequently, he was both Chairman of the Provisional Government and Commander-in-chief of the National Army.
On 22 August 1922 Collins set out from Cork City on a circuitous tour of West Cork. He passed first through Macroom then took the Bandon road via Crookstown. This led through Béal na Bláth, an isolated crossroads. There at the Diamond Bar (which was a farmer house at the time) they stopped to ask a question of a man standing at the crossroad, who turned out to be an anti-Treaty sentry. He and an associate recognised Collins in the back of the open-top car and planend an ambush.
Source: Wikipedia & local reports