During the melee phase, the flanking bonus increases to 90%.
It will now also get a flanking bonus of 30% during the skirmish phase, meaning it does 30% more morale and troop damage. When a flank no longer has an equivalent flank to attack, it will help another flank instead. To have more than one flank you need multiple armies, though they can be merged into one. Each flank has a commander, and its own units. These flanks will generally fight separately against the same flank on the opponent's side. In a battle, each side has up to three flanks: