Attached to B Company in the 3rd Dublin Battalion of the Irish Volunteers, Seán O’Hanlon was based in Boland’s Mill during the Easter Rising, where he was given responsibility for supplies and munitions. He was afterwards deported to Wakefield Prison and interned in Frongoch prison camp. He rejoined the Volunteers upon his release and acted as an armed guard for the Dáil before his arrest in November 1920. He interned until in December 1921 and operated with the republican IRA during the Civil War.
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