Moosen!
http://www.youtube.com/watch?v=yxenUzZPFiQ
(Moosen bit starts around 1:35)
I think moose is the plural of moose, but thanks to Brian Regan I have trouble resisting saying moosen.
The Troll Moose Knights can do some damage (flail is 2 attacks I think, plus antlers and moose kick, that's 4 attacks from that square), but they aren't that much buffer than the other guys, and there probably aren't that many of them.
Don't go in until you feel you have enough guys, but when you do, you might want to set your line way back on hold and attack. Ideally their fast guys get to early and give you a couple rounds of seriously outnumbering* them to take them down before the rest of their line gets to the fight. You probably will take casualties in this fight (especially if the trolls have stars), but hopefully just a couple guys.
[Edit: And by seriously outnumbering them, I guess I actually mean not being horribly outnumbered yourself. What's your bless again? F4 E4 N6?]
Disclaimer: I've never played Fomoria before, so I'm not the best for gauging the strength of your dudes (your sacreds do not look like crap to me though - they look like they can kick butt actually). What's the prot of your Unmarked?
Are there other weaker provinces you can go for before the troll one?
What's your bless again? F4 E4N6?