I've read, that the roman's cycled their men, first line goes to the back 2nd line fights, 2nd line goes to the back 3rd line fights, while the current line is fighting the rest of the men rest, preparing for their turn, allowing the romans to outlast their opponents in battle, why is this not shown in the roman's troops having superior stamina since i realize there is hardly a very good way to repressent this? or am i wrong?

comments requested.