I have a harry potter deathly hallows question for part 2?

I heard and read a rumor that Kingsley, Minerva, and Slughorn were going to duel up against Lord Voldemort. If this is try do you think it would be a major duel like Harry Potter vs Lord Voldemort or even even a seriuos fight like Dumbledore vs Harry Potter? I'm curisou. I have not read the last book yet, though I am on the 5th book(Order of Pheonix).