There is historical evidence that in phalanx warfare that the two sides in the battle reversed positions on eachother over the course of the battle. Now the problem of course is that in a real battle the entire phalanx would be the line but in here it is a number of smaller units. So instead of two giant lines switching we have a number of smaller lines switching. But I think it is a nice nod to historical accuracy. It's weird. I've been reading both here and at the TW center and in both places you've got people saying the game is too historical (eg: the phalanx moving or the Spartans not having corinthian helms) and those saying the game is too RTS. I guess you can't please everyone. :)