Check out this summary of the Battle of the Atlantic
The Battle of the Atlantic lasted almost the entirety of the Second World War. It started when the United Kingdom and France declared war on Nazi Germany in 1939 and it didn’t end until Nazi Germany surrendered. Even then, some U-boats refused to give up the fight with their nation — a maritime version of Japanese holdouts.
It’s hard to really comprehend this battle, both due to the length of the campaign (almost six years of fighting) and the massive scope. Forces clashed the world over, from the North Cape to Montevideo. But between these battles, it was sheer drudgery — long moments of boredom, punctuated by a submarine attack or air raid that would never make headlines.
Despite the languid pace, the Battle of the Atlantic was of paramount importance. Without winning the Battle of the Atlantic, the Allies could never have pulled off the Normandy invasion, much less force the surrender of Nazi Germany. It was all about securing the lines of communication between the United States and the Allied forces in Europe and the Mediterranean.
A Vought SB2U flies over a convoy carrying troops and supplies to the front.