Seán MacMahon
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Seán MacMahon was an Irish nationalist who fought in the 1916 rising as captain of "B" Company, 3rd Battalion, Irish Volunteers, under Éamon de Valera. He later became quartermaster-general of the IRA
MacMahon in Irish Army uniform
Sean Mac Mahon Bridge in Grand Canal Dock, Dublin City.
Gearóid O'Sullivan
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Lieutenant-General Gearóid O'Sullivan was an Irish teacher, Irish language scholar, army general, barrister and Sinn Féin, Cumann na nGaedheal and Fine Gael politician.
Seán MacMahon
…of the printers union at 35 Lower Gardener Street to select a chief of staff in March 1918. Those attending were Collins, Richard Mulcahy, Dick McKee, Gearóid O'Sullivan, Diarmuid O'Hegarty, Rory O'Connor and Seán MacMahon". In 1919 MacMahon became quartermaster-general of the IRA, as the Volunteers had now come to be…
O'Sullivan, c.1920
British Army intelligence file for Gerald O'Sullivan