As Reign had started the battle against the leader of the army, Lieara had done the same, she went out with her elite troop of 100 men and confronted one of the vice-leaders and the other top combatants of the army, the second vice-leader was currently busy with Dain as the bearded man was constantly sending arrows his way, the arrows, of course, prevented him from trying to help the others.
Of course, the arrows by themselves wouldn't be enough to stop the vice-leader, but the presence of another person on the battlefield was enough, even though the vice-leader hadn't seen any other person near him he was still able to feel danger each time he dodged or blocked an arrow and whilst trying to run toward the others.