The Tain

When reading a book about battle, the author usually just goes into full detail about the main battles, and for all the other smaller battles, the author would say, "and others were killed in other battles." but they never go into details. As you read The Tain, you realized that the author goes into great detail for every battle, small or big, one-on-ones or big groups. Most of the death were from the Cu Chulainn, the great warrior who was only seventeen. Why do you think the author decided to go into such great detail on every battle? Was it a way to make it feel the tales of this battle were more than just a story?