I never said their role was defensive, they were involved in wars away from their homelands helping their allies on the continent they didn't have to fight they chose to, thats a pretty agressive attitude in my eyes.
Maybe they're mentioned first by caeser but archeology no doubt attests to their presence long before that and IIRC the faction leader is mentioned in Goidelic legend (and supported by archeology) as conquering all of the south west of britain around the start date.
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