Hi Nocturne.
I'm going to have loads of fun slaughtering the pathetic Dawnguard.
It'll be like a bunch of Kindergarten students hunting a bear.

You do realize if the vampires "rally behind" their leader, they'll be so much easier to kill, don't you? It'll be like shooting sitting ducks. Almost makes you want buy Dawnguard, just for the pleasure of shooting down one after the other, after the other, after the other. So, by all means, rally behind whomever, in a single row, preferably.
