Well, I try following strategy:
1.) remove mad gremlin towers for all costs (even if this would mean to rush in the middle of enemy ranks... mostly in this item battle it is not that bad - as there are mostly only shooters near the towers - two wins for me)
2.) then the "good" gremlin tower, speed/slow and god armor are nasty... down with em!
3.) Griffins...
4.) If I still live and have some mana -> ressurect (if having living army) or corner shooters to "suck" my lost units back (ghosts/ vamp... of course ghosts tend to die quite fast - as they have little HP and get hit by Lightning/ magical attack very often)
But more I would be interested how did you beat them, what difficulty you played on? (I assume Impossible) -> even ingame video (you can convert it to 300x200 -> we would know

) ... please, Metroplex...