Fionn mac Cumhaill won leadership of the Fianna by slaying Aillen mac Midgna, the burner of Tara, and commanded the war-bands of Ireland from that day until the Battle of Gabhra shattered the order forever.
The Fianna roamed the forests and hills of Ireland under Fionn mac Cumhaill, with warriors like Oisín and Diarmuid Ua Duibhne among their ranks — each tested by impossible feats of skill and endurance before he could join.
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