What Nafs and Alrick said. Though I have to add, I wouldn't say 'раздавите' either. You imply that you're going to kill them solely by putting rather something heavy on them. Crushing is breaking as referred to breaking bones. Additionally, 'противник' is a somewhat modern word you'd probably use in tactics. I doubt that a barbarian would refer to his enemies as 'противники'. IMHO you'd be best off with:

''сокрушите врагов ваших!" ("crush thy foes") is somewhat better, but still somewhat corny. I think, a Russian would prolly say "в атаку!/в пред!" ("charge!") or more likely, in the given context, "мочи козлов!" ("(rude, but not vulgar) kill those bastards", literary "wet the goats").

Eitherway, it's no biggy here. :P I think it's much more embracing when a 80 million dollar film can't hire a bum for 5$ to check their Russian/German/French/whatever.

PS: And, yeah, Noctivagus, go and watch "Red Dawn" or something.