Second, cavalry and horse archers have maneuver values of 2 and 3 respectively. This doesn't mean they get to attack archers necessarily, but it does mean two things. Cavalry and horse archers on the flanks get access to a flanking bonus if they can attack any unit that can't attack them directly. Second, horse archers can play support to cavalry by sitting in the second rank (like regular archers) or get a flanking bonus by sitting on the wings of the army (like their cavalry brothers). The army will do its best to configure itself to whichever mode will work best, putting horse archers on the extreme flanks if effective, and deploying the rest to the second rank where they can support.
