That power was exercised to a great extent over the elements, some of which Druids claimed to have created. Thus the Druid Cathbad covered the plain over which Deirdre was escaping with "a great-waved sea."[1099] Druids also produced blinding snow-storms, or changed day into night--feats ascribed to them even in the Lives of Saints.[1100] Or they discharge "shower-clouds of fire" on the opposing hosts, as in the case of the Druid Mag Ruith, who made a magic fire, and flying upwards towards it, turned it upon the enemy, whose Druid in vain tried to divert it.[1101] When the Druids of Cormac dried up all the waters in the land, another Druid shot an arrow, and where it fell there issued a torrent of water.[1102] The Druid Mathgen boasted of being able to throw mountains on the enemy, and frequently Druids made trees or stones appear as armed men, dismaying the opposing host in this way. They could also fill the air with the clash of battle, or with the dread cries of eldritch things.[1103] Similar powers are ascribed to other persons. The daughters of Calatin raised themselves aloft on an enchanted wind, and discovered Cúchulainn when he was hidden away by Cathbad. Later they produced a magic mist to discomfit the hero.[1104] Such mists occur frequently in the sagas, and in one of them the Tuatha Dé Danann arrived in Ireland. The priestesses of Sena could rouse sea and wind by their enchantments, and, later, Celtic witches have claimed the same power. In folk-survivals the practice of rain-making is connected with sacred springs, and even now in rural France processions to shrines, usually connected with a holy well, are common in time of drought. Thus people and priest go to the fountain of Baranton in procession, singing hymns, and there pray for rain. The priest then dips his foot in the water, or throws some of it on the rocks.[1105] In other cases the image of a saint is carried to a well and asperged, as divine images formerly were, or the waters are beaten or thrown into the air.[1106] Another custom was that a virgin should clean out a sacred well, and formerly she had to be nude.[1107] Nudity also forms part of an old ritual used in Gaul. In time of drought the girls of the village followed the youngest virgin in a state of nudity to seek the herb _belinuntia_. This she uprooted, and was then led to a river and there asperged by the others. In this case the asperging imitated the falling rain, and was meant to produce it automatically. While some of these rites suggest the use of magic by the folk themselves, in others the presence of the Christian priest points to the fact that, formerly, a Druid was necessary as the rain producer. In some cases the priest has inherited through long ages the rain-making or tempest-quelling powers of the pagan priesthood, and is often besought to exercise them.[1108]