Select any ammount of troops you'd like (shaman can be included), hold Ctl+Alt, then click on the floor once, and then on a second point (this second point must be an enemy unit, or any building, never terrain or stone heads). What happens is that those braves will patrol on circles, on the first point of the terrain where you've clicked. Now, if you press "n", they will stop patrolling, and will move to the second point.

This can be done with many different groups of units, and once you press "n", all groups will move to their particular second point. This can get handy and is a useful way of avoiding some multi tasking.