Dorsai versus The Empire might be an interesting match. Or Pak Protectors.

I don't think the Dorsai have the numbers, then again, they probably wouldn't need them (they have been known to subdue planets with a handful of soldiers). They'd also be nigh immune to Empire terror tactics.

Pak have the same problem though. Probably not enough of them. But considering what they can do with so few (I mean, they built the ringworld, a construct which dwarfs even a Death Star). Imperial ground forces would be no match against Pak Protectors, I'm not even so sure how a Sith Lord or Apprentice might fare against one.