A VAMPIRE JUGGERNAUT is a very good combination, with this combination I came to lvl 11 :). The vampire gives you around 1-6 health per hit, and with the shield you can build up your health in trouble. Try to build up your strenght because how more you hit, how more health you gain :D.
Aw, I remember coming to this site just so i could play part 1 of Warlords with all the races, too bad he changed it now to Armour Games :(. Oh and a pretty good game, I just dont like the red ring what tells you when units are done which you can barely see :P.