Oh, the dirty bastards pull a stealth mission on you when you're already running three BB fleets a piece. Additionally, your mandatory escort ship is a Grand Cruiser so you just can't go small and sneak around. Complete bunch of arse with instant failure and a long cut scene at the beginning.
Edit: Finished the entire Chaos campaign other than the Necron amphetamine parrot. Can come back for that when I give a damn to do the same mission 20 times. A poor choice for the game. A lot of fun, all the mechanics have been tweaked so there's always more to do even on the easy ones, and the pay off is good. Remember - use your Chaos Gifts, I ended up with over 50x each since I forgot about them.