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| 1922, Jan. 7 |
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| The dáil Eireann accepted the settlement, 64–57. | 1 |
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| Jan. 9 |
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| Resignation of De Valera. Griffith became president of the executive council and Collins prime minister. The dáil ratified the treaty (Jan. 14). | 2 |
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| March 15 |
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| De Valera organized a new Republican Society and began an insurrection against his former colleagues; irregular forces resumed the methods of assassination and arson formerly used against the British. | 3 |
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| March 30 |
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| Collins and Craig signed a peace pact at the Irish conference in London. This was followed the next day with the passage of the Irish Free State (Agreement) Act, giving force of law to treaty articles and providing for the transfer of powers to the provisional government within four months. | 4 |
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| April 7 |
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| The Civil Authorities (Special Powers) Act for Northern Ireland went into effect for one year. It was renewed annually until May 9, 1933, when it became permanent. | 5 |
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| April 14 |
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| Rebels seized the Four Courts, Dublin, from the Free State government. | 6 |
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| May 31 |
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| The Royal Ulster Constabulary created. | 7 |
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| June 16 |
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| Government forces won a great victory in general elections. | 8 |
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| June 28 |
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| Government troops laid siege on rebel forces at Four Courts, beginning a civil war. The rebels surrendered two days later, but heavy fighting continued in Dublin (June 30–July 5). Limerick and Waterford were captured by government troops on July 20, Cork on Aug. 11. | 9 |
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| Aug. 12 |
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| Death of Arthur Griffith. | 10 |
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| Aug. 22 |
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| Assassination of Michael Collins by the Republicans. | 11 |
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| Sept. 9 |
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| WILLIAM T. COSGRAVE BECAME PRESIDENT of the executive council and, aided by Kevin O'Higgins, began a policy of rigorous repression of the Republicans. | 12 |
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