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Rh when together in Scáthach's Isle, and they have been elaborated with considerable care, while Cúchulainn's grief when his friend and antagonist fell on the fourth day is very touching. Fer Diad, it may be explained, was a match for Cúchulainn so long as they fought with the same weapons, but Cúchulainn at last called for the Gái Bolga, which he always held in reserve. This was a missile which he directed that time by means of his feet, from the water in the ford upwards into his antagonist's body, and it proved at once fatal. What this strange weapon may have been in actual war, one cannot exactly say; but, mythologically speaking, the direction of it from the water upwards would seem to indicate as its interpretation the appearance of the sun as seen from the Plain of Murthemne when rising out of the sea to pierce with his rays the clouds above. In another instance the Gái Bolga is brought down on the head of Cúchulainn's antagonist with the effect of crushing him, which would seem to refer to the action of the sun's rays on the clouds below from his position on high in the heavens.

It will now be readily understood how it came about that Irish mythology could treat the Sun-god and certain of the dark beings as at times his bosom friends; and also how some of them had nevertheless to fight with him and fall by his hand. Lugaid was one of this class, but the euhemerism of Irish tales, in the form we have them, has tried hard to keep Lugaid as the friend of Cúchulainn distinct from Lugaid as his mortal enemy;