The semi-mythic histories of the invasions of Ireland, while conflicting, point to a common thread. Coming from southern Gaul, northern Iberia, and typically both, there came a great multitude of people who settled in the lands of the south, within the kingdom of Erainn. The migration was motivated by numerous factors, such as need for more land for the growing population, stories of the wealthy mines of Ireland, and religious beliefs that implied the island was a sacred refuge of the gods.
Well-motivated, the people began to migrate at the inference of one of their kings, who is named in the histories, recorded much later from a combination of oral histories and hagiographies, as Milesus. Milesus merely means 'Soldier of Spain', though, and implies he was a warlord of some power and distinction. Milesus, before being able to go himself, was killed in battle. The job to invade Ireland, then, fell to his sons and other relatives. They gathered their people and allies, and began a great expedition.
While the hagiographies imply a much more warlike landing usually, archaeology implies the south actually welcomed them. When the first Gadelic objects appear, they are often alongside the graves of the local Celts. As such, we can infer the Erainn were friendly to them. The Gadels were given a land to settle, which had been depopulated by raids from the Fer Bolgia, a Belgic and Cruithni tribe that inhabited much of what is now Connacht. This was the land of Ebherni, and the tribes adopted the name as their own, and joined within the confederacy-kingdom of the Erainn. They dwelled there around a great fortress named Ebhernis, or Ivernis.
Upon settlement, a warlord from the north, a member of the Cruithni people, kin to the people of Caledonia, had already planned an assault on this percievably weak stronghold. They marched a force of men, composed of various Celtic and Cruithni tribes, into the west, and turned south, through the land of Fer Bolgia, on to Ebhernis.
The leader of the Ebherni called for aide. This leader is alternatively Eremon, Eber, or Ithil, one of the sons or nephews of the soldier of Spain, who had become the chieftain of his people. The Erainnach sent aide from their tribe to hold the enemy at a river-ford north of the fort of Ebhernis, to repulse the Cruithni and protect this gateway into the south of the island. Loss of the battle would open this region to intense raiding.
Undaunted, the Cruithni, under a warlord named Hama, or Amag, moved south, and met his enemy. The Cruithni were of greater number than the Gadels and their allies, but undisciplined and over-eager. They charged into the ford where they were slaughtered in the ensuing melee by the Erainnach, who drove them back over the river. The Cruithni fell back far from the ford to reform their lines.
In this time, Eremon's men and the Erainnach both crossed the river and reformed, and launched a brief sortie between their cavalry and young Cruithni men armed with darts and javelins. After this skirmish, the Cruithni charged again, with their warlord at the head of the charge in desperation. He was cut down almost as soon as he reached the opposing line, and his head cut off and taken as a trophy. His army soon routed at great expense, with many being captured or killed by the pursuing Gadels.
With the victory, the Gadels cemented themselves as a powerful element in the Irish scene, with good, disciplined soldiers, and enjoyed increased political influence. Their influence entered into the Erainn so much that a syncretic culture began to form, as nobles embraced Gadelic society. A Gadelic noble class bred further a mixed culture that became the earliest Gaels. These people came to dominate the island, ultimately subjugating the earlier Celts and Cruithni people to their own culture.
Had the battle gone otherwise, this may not have occured. This is not a definite, as the battle was not of substantial size. However, had the Cruithni had easier access to the southern kingdoms, any expansion of their society would have taken much longer, and the series of wars fought between the various kingdoms may have grown in size and commonality, to the point where the island would have descended anarchy of the proportion only seen in post-Norman invasion Ireland.
The success and rise to prominence of the Gadels completely transformed the political landscape of Ireland. The creation of Gaels advanced the technology of the island substantially, and introduced new concepts, weapons, and superior organization that facilitated the large scale invasions of Britain in the waning days of the Roman Empire; one of the reasons Britain became so unprofitable as to necessitate abandonment by the Romans. The success of the Gadels in their initial battles in Ireland, as such, could have had farther reaching influence in the history of all the islands than we can readily percieve.
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