Birth of Fin MacCumhail and Origin of the Fenians of Erin

"Who is this," screamed Cat-head, "who dares to interfere with my ancestral right?"

"I," shouted Fin. Then the struggle began fiercer than with the second brother. Bran helped from behind, tearing the flesh from his head to his heels; but at length Cat-head fastened his teeth into Fin's breast, biting and gnawing till Fin cut the head off. The body fell to the ground, but the head lived, gnawing as terribly as before. Do what they could it was impossible to kill it. Fin hacked and cut, but could neither kill nor pull it off. When nearly exhausted, Bran said:

"Why don't you chew your thumb?"

Fin chewed his thumb, and reaching the marrow knew that the old woman in the east was ready to start with torches to find her sons, and burn the dun herself, and that she had a vial of liquid with which she could bring the sons to life; and that nothing could free him from Cat-head but the old woman's blood.

After midnight the old hag, enraged at the delay of her sons, started and shot through the air like lightning, more swiftly than her sons. She threw her torches from afar upon the roof of the dun; but Bran as before hurled them into the stream.

Now the old woman circled around in the air looking for her sons. Fin was getting very weak from pain and loss of blood, for Cat-head was biting at his breast all the time.

Bran called out: "Rouse yourself, oh, Fin; use all your power or we are lost! If the old hag gets a drop from the vial upon the bodies of her sons, they will come to life, and then we're done for."

Thus roused, Fin with one spring reached the old woman in the air, and swept the bottle from her grasp; which falling upon the ground was emptied.

The old hag gave a scream which was heard all over the world, came to the ground and closed with Fin. Then followed a battle greater than the world had ever known before that night, or has ever seen since. Water sprang out of gray rocks, cows cast their calves even when they had none, and hard rushes grew soft in the remotest corner of Erin, so desperate was the fighting and so awful, between Fin and the old hag.