I was thinking if formations could be added, with each bearing advantages, here is a list.
Square: Soldiers form a square formation (not ot be confused with Napoleonic ones), it is not useful for charging but works wonders against other charges and cavalry, it also holds up against flank attacks.
Column:Troops move far quicker, however they are horrible at defense, attack, and can be easily flanked, essentially a defense formation.
Line formation: Perfect for covering a wide area and also giving ranged hell, good for charges and average for defense
It would work by cycling through a button by pressing it.