Seamus Brennan joined the Tullamore branch of the Irish Volunteers upon their formation in November 1913. On 20th March, 1916, he was involved in an incident which resulted in the shooting of an RIC Constable in Tullamore. He subsequently fled the town and joined the Kimmage Garrison in Dublin. After helping George Plunkett to commandeer a tram on Easter Monday, Brennan took up a position in the Tower Bar, across from the GPO. He was interned until June 1916. Brennan rejoined the Irish Volunteers upon his release and assisted with Sinn Féin’s election campaigns in 1917 and 1918. He was twice interned during the War of Independence, participating in a hunger strike on one occasion.
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