I know you can change the party order by moving troops up and down to decide what troops go in battle first, but I could have sworn there was another way to do it.

Like if take a 400 man army into battle with 200 of the same infantry and 200 of the same archers, is there a way to take maybe 2/3's infantry and 1/3 archers in each wave?

Otherwise I'll just end up with nonstop infantry waves until they all die then nonstop archers.