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Diarmuid O'Hegarty was an Irish revolutionary and civil servant.
Born in Cork, O'Hegarty was prominent in the re-organisation of the Irish Volunteers after the 1916 Easter Rising. He was vice-commandant of the Irish Republican Army's 1st Dublin Brigade and became IRA Director of Organisation in 1920.
Supportive of the Anglo-Irish Treaty, in September 1922, following the death of Michael Collins, he was appointed commandant general, a member of the Army Council, and Director of Intelligence of the National Army
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