2. D-Day was Made Possible by Allied Efforts Elsewhere
Allied efforts were not just centralized at the Normandy beach. They were spread out across various fronts before and after June 1944. The Allies conducted a strategic bombing campaign that started in 1942. This destabilized the German establishment and forced the Nazi to commit manpower and resources to home defense away from Normandy.
Allied control of the Atlantic achieved through the 1943 victory in the Atlantic Battle also determined the success of the D-Day invasion by directing away the German troops. So did Operation ‘Bagration’, the Soviet Belorussian offensive launched soon after ‘Overlord’. It smashed the entire German Army Group Centre and kept German forces knotted down in the east.
1. There is More to the Allied Normandy Campaign than D-Day
D-Day did not end the war, but it sure was the turning point in the history of World War II. With that significance, D-Day often tends to overshadow the overall importance of the whole Normandy campaign.
It was necessary for the Allied groups to establish a bridgehead, though this was just their first step. They launched a series of additional assaults in the three months that followed D-Day to try and advance further into France. Strong German forces were resisting them all the way. The Normandy landscape was peculiarly characterized by recessed lanes and thick high hedges. These gave the advantage to the Germans and made it difficult for the invaders to penetrate.
Nonetheless, the protracted and bloody Normandy war paved the way for the Allied victory and the eventual liberation the broader Northwest Europe.