World War II begins and the Germans succeed in invading Poland and France. But German forces are restrained by the British thanks to the vital convoyst, the German submarine war increases its crescendo thanks to new French bases.

With war now declared by the U.S., naval forces throughout the states have joined to bring convoys of supplies across the Atlantic Ocean to the Allies in England. German U-Boats come through and manage to destroy some of ships along the way.

The Japanese are ascendant as they successfully invade the East Indies, Singapore and the Philippines. But the Americans are victorious, first on the Coral Sea and ultimately on Midway as they manage to bomb and sink four of Japan's aircraft carriers; the same ones that were used for the attack on Pearl Harbor-making the imperial fleet retreat and giving the U.S. an early victory in the Pacific.

World War II comes to the Mediterranean Sea as Italian, French and British naval forces struggle. British forces have the unenviable position of guarding the sea as they escort convoys from Gibraltar to Malta.

After training in Australia and New Zealand, the U.S. Marines land on Guadalcanal. The U.S. Navy suffers defeats by the Japanese Navy around the island-in an area called Ironbottom Sound.