This isn't the official story, as to my knowledge there isn't a set scenario for what actually happened, but in The Lord of the Rings: The Third Age, which was, for those who don't know, a turn based combat rpg, the riders of Snowbourn did not show due to their village and surrounding lands being almost completely razed by the marauding Uruk-Hai.
So ConTheJedi was mostly right by his head cannon.
Go you!
Lord_Barreion
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