Question: What act of a mythical hunter-warrior of Irish mythology won him the leadership of the Fianna?
Sentence (from "Fionn mac Cumhaill"): Fionn mac Cumhaill ( ; ] ; Old Irish: " and Middle Irish Find or Finn, mac Cumail" or "Umaill" ), sometimes transcribed in English as MacCool or MacCoul, was a mythical hunter-warrior of Irish mythology, occurring also in the mythologies of Scotland and the Isle of Man.
Relevant evidence: Yes