Over five years, thousands of ships engage in 100-plus battles in the Atlantic Ocean with approximately 100,000 lives lost.
World War II's longest continuous campaign takes place, with the Allies striking a naval blockade against Germany and igniting a struggle for control of Atlantic Ocean sea routes. The Axis, with its U-boats, responds with a counter-blockade that is at first successful, but the Allies' use of convoys, aircraft and technology eventually turns the tide. Over five years, thousands of ships engage in 100-plus battles in the Atlantic Ocean with approximately 100,000 lives lost.