Finn discovers that the Scottish giant – Benandonner – plans to come to Ireland to fight him. Benandonner is a much larger giant and Finn knows that he is unlikely to win the fight, so he asks his wife – Oona – to help him.
Oona dresses her husband as a baby and tells him to hide in a cradle. She makes a big batch of griddle-cakes and hides griddle-irons in some of them so that they are as hard as rocks.
When Benandonner arrives, Oona tells him that her husband is out. She invites him to wait for Finn’s return and offers Benandonner one of the griddle-cakes. When he bites into the iron he chips his teeth and Oona mocks him for being weak. She tells him that Finn eats these cakes easily and feeds one (without an iron) to the ‘baby’, who eats it without trouble.
Benandonner is so amazed by the strength of the baby’s teeth that, at Oona’s prompting, he puts his fingers in Finn’s mouth to feel how sharp they are. Finn bites down hard on Benandonner’s little finger. The Scottish giant is terrified at the prospect of meeting Finn, considering the size and strength of his baby. He runs back towards Scotland, smashing the causeway behind him so that Finn cannot follow.
According to popular legend, Finn is not dead but sleeping in a cave, surrounded by his followers – the Fianna. It is said that they will awake one day and defend Ireland in her hour of greatest need.