The effect of the Mustang on the Luftwaffe was swift and decisive. The result was that the Luftwaffe was notable by its absence over the skies of Europe after D-Day, and the Allies were starting to achieve air superiority over the continent. Although the Luftwaffe could (and did) mount effective attacks on the ever-increasing number of Allied heavy bomber formations, the sheer numbers of Allied bombers attacking targets throughout occupied Europe overwhelmed the German fighter force, which simply could not sustain the losses the Eighth Air Force bombers and fighters were inflicting on it.