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I've been lurking the interwebz in search of any decent White Scars fluff and the like, and have come up near zilch. Is this because they simply got passed over or am I missing something. They seem cool, but all I found was "They're like the Huns, and they're very good at hunting," I read a story or two in the codex. Any information on their interaction with other imperial forces, accomplishments, anything?

Look up "The Hunt for Voldorius". This was a pretty big White Scars campaign.

Another real good source of info is in the first Index Astartes if you can find a copy of it.

Could try the sources on the bottom of the Lexi article:
http://wh40k.lexicanum.com/wiki/White_Scars#.TqWX7XJaeVo

Also "savage scars" / BL.