And so this mystic sword may, perhaps, have been a god amongst the Celts, or the god of the people with whom the Celts contended somewhere on their long journey to the west.

It is a fiction now, but it may be founded on fact, and that fact probably was the first use of iron." To this day an old horse-shoe is considered a potent spell in some districts against the powers of evil; and for want of a horse-shoe a bit of a rusty reaping-hook is supposed to have equal power, "Who were these powers of evil who could not resist iron--these fairies who shoot STONE arrows, and are of the foes to the human race?
Is all this but a dim, hazy recollection of war between a people who had iron weapons and a race who had not--the race whose remains are found all over Europe?
If these were wandering tribes, they had leaders; if they were warlike, they had weapons.

There is a smith in the Pantheon of many nations.

Vulcan was a smith; Thor wielded a hammer; even Fionn had a hammer, which was heard in Lochlann when struck in Eirinn.

Fionn may have borrowed his hammer from Thor long ago, or both may have got theirs from Vulcan, or all three may have brought hammers with them from the land where some primeval smith wielded the first sledge-hammer; but may not all these 'smith-gods be the smiths who made iron weapons for those who fought with the skin-clad warriors who shot flint-arrows, and who are now bogles, fairies, and demons?
In any case, tales about smiths seem to belong to mythology, and to be common property."-- CAMPBELL, Popular Tales of the West Highlands, Preface, 74-6.
[19] BROOK, Discovery of Errors in the Catalogue of the Nobility, 198.
[20] MEYRICK, i.