Once all subs have moved, firing resolution takes place. Players must roll for initative by each rolling a D10 and adding their submarine's (or nation's) initative roll. Firing weapons requires the use of a command point for each target, and each type of weapon. Therefore it takes one command point to fire all loaded torpedoes at one submarine, and two command points to fire two torpedoes at two different target submarines.
Submarines have two main weapons (see advanced rules for more types of weapons).