Spearmen have 10 armour, if you don't lose it to Axemen or Banshees you can tank spitter shots because armour gives 70% damage reduction. And they don't die to suicide guys, because with enough attack speed they push them away faster than they can walk towards the spearmen.
While any faction can do this with enough units camping the spawn, getting to that stage in the game is super hard with melee only, unless you play Aurelia.
being able to do they are billions on hardest difficulty with my eyes closed, i thought this game would be easy....but i cant even get past wave 3 on normal..