-Keep brigades and their commanders close together to have them fight better when they are adjacent to their own brigade. Brigade commanders have a positive effect on units in the surrounding hexes. This is vital during melee and when checking morale against disruption and rout.
-Surround enemy units to destroy and/or capture them. Units have a "zone of control". Opposing units have to stop upon entering a "zone of control". Units with a failing morale check cannot retreat from a "zone of control". Once caught in the "zone of control", these units are trapped. This is an easy way to inflict plenty of casualties without causing significant damage to your own units.