In one version of the tale, Fionn killed Goal and the rest of his men; in another, he humbled Goal, who later became one of his most trusted soldiers and married Keva, daughter of Fionn mac Cumhail.
Tales of Finn and the Fianna were widely documented in the 3rd century CE during what is now referred to as the Fenian Cycle, although much earlier written accounts have also been found in ancient Irish manuscripts.
Finn's father Cumhail, a Fianna chieftain, was mortally wounded and killed in battle by GoalMacMorn, the leader of a rival clan, before Finn's birth.
The battle was long, lasting a few days, but in the end Mac Morna's men were no match for the Fianna and Goll Mac Morna died on Finn's sword.