Seán MacMahon was an Irish nationalist who fought in the 1916 rising. He took the pro-treaty side in the Irish Civil War (1922–23) and rose to be chief of staff of the Irish Defence Forces

Ernest Bernard Malley was an Irish republican and writer. After a sheltered upbringing, he witnessed and participated in the Easter Rising of 1916, an event that changed his outlook fundamentally. O'Malley soon joined the Irish Volunteers before leaving home in spring 1918 to become an IRA organiser and training officer during the Irish War of Independence against British rule in Ireland. In the later period of that conflict, he was appointed a divisional commander with the rank of general. Subsequently, O'Malley strongly opposed the Anglo-Irish Treaty and became assistant chief of staff of the Anti-Treaty IRA during the Irish Civil War of 1922–23.