electricwisekid
Legend
Hm that actually seems somewhat reasonable I thinkI forgot who said it and on which thread, but cutting the map into tiles, and determining based on the terrain there, takes up a set portion of an armies' turn, and if my explanation is awful, much like Civ 5's travelling with Units
Ex: Marching across two 'tiles' of a plain field would take the same amount of a turn as marching across a tile filled with Mountains or Rivers.
EDIT: and depending on the size of an army, and if they're mounted or on foot, they can move further or slower