I think I remember hearing/reading an interview where Colin Meloy said the Tain wasn't so much about the story itself, but about the characters in and around the main action. So some of it is a direct reference to the story (Medb trying to steal the bull, Cuchulain being chased by dogs) but some of it is in reference just to the soldiers involved with the fighting (Part IV) and the victims of the fighting (Part V)
I think I remember hearing/reading an interview where Colin Meloy said the Tain wasn't so much about the story itself, but about the characters in and around the main action. So some of it is a direct reference to the story (Medb trying to steal the bull, Cuchulain being chased by dogs) but some of it is in reference just to the soldiers involved with the fighting (Part IV) and the victims of the fighting (Part V)