Units are divisions, command is based on corps for which each has a leader.
There are also army leaders. Before each activation, players roll dice to determine who has initiative, the Confederates winning on ties. The winning player may activate a single division or a corp commander who may activate all the divisions within his corp and with his command range. The basic order for a unit is to move, and combat occurs and is dependent on movement. The less you move to engage an enemy unit, the better prepared your unit is for battle and the better it will perform.