Moving troops in battle

Maybe this is common knowledge, or maybe it will help someone. I’ve tried searching for information on how to effectively position yourself during battle, and couldn’t find this specific mechanic until I stumbled on it myself. If you right click, and hold, when telling troops where to go, you can drag left or right, and spin the formation around the way you want them facing. I can setup a defensive line, 2 deep, with mercenaries, flank with retinue, and come out with 0 losses most times.