By some accounts, She is the consort of the Dagda, while the Badb and Nemain are sometimes listed as consorts of Néit, an obscure war god who is possibly Nuada the Sky Father in His warrior aspect. It is interesting to note that another battle goddess, Macha, is also associated with Nuada.
Éire, a goddess connected to the land in a fashion reminiscent of the Mothers, could appear as a beautiful woman or as a crow, as could the Morrígan. The Dísir appeared in similar guises. In addition to being battle goddesses, they are significantly associated with fate as well as birth in many cases, along with appearing before a death or to escort the deceased. It is interesting to note that some sources present Éire and the Morrígan as half-sisters.
There is certainly evidence that the concept of a raven goddess of battle wasn't limited to the Irish Celts. An inscription found in France invoking Cathubodva, 'Battle Raven', shows that a similar concept was known among the Gaulish Celts.
During the Second Battle, the Morrígan "said she would go and destroy Indech son of Dé Domnann and 'deprive him of the blood of his heart and the kidneys of his valor', and she gave two handfuls of that blood to the hosts. When Indech later appeared in the battle, he was already doomed." (Rees 36)
Compare this to the Washer at the Ford, another guise of the Morrígan. The Washer is usually to be found washing the clothes of men about to die in battle. In effect, She is choosing who will die.
An early German spell found in Merseburg mentions the Indisi, who decided the fortunes of war and the fates of warriors. The Scandinavian Song of the Spear, quoted in Njals Saga, gives a detailed description of Valkyries as women weaving on a grisly loom, with severed heads for weights, arrows for shuttles, and entrails for the warp. As they worked, they exulted at the loss of life that would take place. "All is sinister now to see, a cloud of blood moves over the sky, the air is red with the blood of men, and the battle women chant their song." (Davidson 94)
An Old English poem, Exodus, refers to ravens as choosers of the slain. There are links between ravens, choosing of the slain, casting fetters, and female beings in many sources.
"As the Norse and English sources show them to us, the walkurjas are figures of awe and even terror, who delight in the deaths of men. As battlefield scavengers, they are very close to the ravens, who are described as waelceasega, 'picking over the dead'..." (Our Troth)
"The function of the goddess [the Morrígan] here, it may be noted, is not to attack the hero [Cúchulainn] with weapons but to render him helpless at a crucial point in the battle, like the valkyries who cast 'fetters' upon warriors...thus both in Irish and Scandinavian literature we have a conception of female beings associated with battle, both fierce and erotic." (Davidson 97, 100)
She appeared to him on at least four occasions and each time he failed to recognize Her.
1. When She appeared to him and declared Her love for him.
2. After he had wounded Her, She appeared to him as an old hag and he offered his blessings to Her, which caused Her to be healed.
3. On his way to his final battle, he saw the Washer at the Ford, who declared that She was "washing the clothes and arms of Cúchulainn, who would soon be dead."
4. When he was forced by three hags (which represent the Morrígan in Her triple aspect) to break a taboo of eating dogflesh.
Our Troth (Ring of Troth)
Rees, Alwyn and Brinley, Celtic Heritage (NY: Thames & Hudson, 1994)
Ross, Anne, Pagan Celtic Britain (London: Routledge & Kegan Paul, 1967)