No intent to rob and no actually robbery. Breaking and entering, and if they so much as touch an occupant then felonious assault are possible charges. Then at the civil trial, mental anguish.
I thoguth that entering a dwelling with the purpose of attacking the occupants therein was classified as home invasion robbery, though I suppose some states might call it aggravated burglary or somesuch. Though you're right that if they actually encounter anyone, that would add in crimes of aggravated assault and/or aggravated battery. Perhaps most important, though: if anyone is killed, felony murder. A cop who wants to avoid a murder rap from a no-knock raid should be required to take personal responsibility for checking that the warrant matches the address. Anyone not willing to take such responsibility has no business conducting such raids.