The best race to play with is human alliance. They have the +10 armor and it costs only 600 to buy spear upgrade. Trolls are useless with the starting speed upgrade. Demons are not hard either; just put 5 human spear men in the middle lane, then switch 1 up above the middle and put 5 there then back down 1 to the middle and repeat. For charge, use mounted spear men. I was able to defeat the whole demon territory with 2 speed, 2 armor, 2 spear. For proof: http://i51.tinypic.com/116othg.png
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