What episode (s) is the fight between Ace and Blackbeard?

But Ace is in Impel Down during episode 440... Do tu mean 340? Thanks for answering, por the way. XD

when Ace was being transported to Navy HQ and Luffy was on their way to Level 3 ( i think) the fight was shown..

Oh, I get ya... So it was a flashback to Ave getting captured. Thanks.

*Ace