Once in the campaign what you do next is up to you.
Create your own custom battles from small skirmishes to epic conflicts, choosing from Axis or Allied fleets with ships from 6 playable nations to choose from.
Destroy the enemy patrols and weaken their defences. A combination of sandbox elements and the deadly combat of RTS naval warfare ensures a vast number of possibilities. Will it help or hamper you?
Harass enemy shipping to starve their ports of vital supplies.