what happens is that normally if at the start of the game if u kill all their miners u win the game (not immediately of course).
this works for normal, i havent tested hard or insane.
actually i completed that.For normal, quite easy, just get a spearton and a miner at start then get 4 miners on gold and 1 on mana, then continue training spears til u ko their tower.For hard or insane, miner wall
I think the best (but not the quickest) way to fight deads is spears (meat shields/2ndary damagers), merics & a magikill with Electric Wall (primary damager). Hope it helps.
P.S., I think rushing is EXTREMELY unsound/unstable on DEADS level...