Sounds great and the unit formations sound like they have diffrent aspects of stratergy in them. The elves seem to as descrbed before have the best mellee/formations in the game. I think they however with there fatigue will need careful planning to keep them from being out manouvered possibly switching units during combat to suit diffrent situations by a means of rotation. (could be intresting if this micro management could be implemented during a large siege).
With regards to the humans they have the most range and look to be the most diverse fighting unit so they will be the choice for the most flexible player.
Hmm which to choose......
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