Battle Ground: The Battle of Atlantic
This is the DVD release (see more).
SummaryThe conflict at seas between Allied merchant ships and their escorts and German U-boats, christened the Battle of the Atlantic by Winston Churchill, was the longest and arguably the most critical campaign of WWII. If Britain had fallen, there would have been no base for the western Allies to launch a strategic air offensive or a land invasion of the European mainland to defeat Germany. To survive, Britain needed imports of food, fuel and raw materials from overseas. The Germans used submarines (U-boats), mines, surface warships, armed merchant ships and aircraft during the battle, but it was the U-boats that posed the deadliest threat to Britain's survival.