When an army in fortified stance is attacked it will result in a limes (frontier) or encampment battle, where the defenders will deploy in or around a wooden fort. As before, allied or reinforcing forces may be drawn into the battle. Allied or reinforcing forces may be drawn into the fight.
When a walled settlement is attacked, the defender deploys behind the walls or has the option to sally out and meet the attacker outside. The attacker has to break in, either by use of siege engines or artillery, or by burning down the gates by selecting a unit and then right-clicking on the gate. Allied or reinforcing forces may be drawn into the fight. See the section of sieges for further details.