Since I frequently forget which unit belongs to which command - and God knows those impetuous French can get intermingled after a few hard rounds of fighting - I took up a suggestion from a fellow player to put a discrete mark on the back of the unit to denote which command it came from. Northern battle: blue, central battle: red, and southern battle: yellow. I do this for the mounted and dismounted knights and for many of the skirmishers as well. (I have several extra units of skirmishers to ensure that I can make change, and I dont mark the Spanish skirmishers since they are distinguishable by themselves.)