Question: What act of a mythical hunter-warrior of Irish mythology won him the leadership of the Fianna?
Sentence (from "Fionn mac Cumhaill"): The stories of Fionn and his followers the Fianna, form the Fenian Cycle ("an Fhiannaíocht"), much of it narrated in the voice of Fionn's son, the poet Oisín.
Relevant evidence: No