German air superiority was lost on the Eastern Front, where fighters and bombers were no longer present in numbers sufficient to offer the ground forces the support they needed to defeat the Red Army, support that had played such a key role in the early stages of the war. Allied bombers were able to pulverize the roads, bridges and railways behind the Normandy beaches in 1944, making it impossible for the German army to bring up adequate reinforcements. Had the German air force retained the command of the skies, the invasion could not have taken place.73
