The D-day Landing Has Failed

The D-day landing on 6 June 1944 was a pivotal historic event. But what if that landing had failed? What if the Allied Forces were pushed back into the English Channel? When would Europe have been freed from Nazi Occupation? In fact the question can be raised, would it have been? Would Hitler been able to to retain power. Would the Russians have been able to take eastern Europe and possibly ultimately Western Europe? Our landing in Italy was still stalled in northern Italy in April 1945.