This opening establishes control of movement as the central purpose of naval warfare. A navy need not command every ocean to be useful: local control around a convoy may be enough to move essential goods. Conversely, a blockade, minefield, or submarine can deny an opponent even limited use of the sea. Commerce protection and commerce denial are central sea-power missions.
Chapter · 0:24-2:15
Sea control as control of movement
The opening frames naval warfare around the ability to move goods across the sea or deny that movement through blockade, mines, submarines, or convoy protection.