So. Popular perception of the D-Day Landings(73 years today) is that they were a foregone conclusion.
Because they succeeded, the majority of people think that it was a done deal, and that it merely needed to be attempted and it would've worked.
This is not so.
Eisenhower was publicly extremely confident that the landings would succeed. Kind of had to be. Couldn't let the young men who were about to land on the shores of France think this was one massive gamble with pretty good odds of failure. But that's what it was. I've stated before that D-Day wasn't the tide-turning moment of the war. However, that doesn't mean it wasn't important.
Without the addition of a second front in the West the war would've dragged on at least until August 6th, 1945. The second front meant the Germans had to use precious manpower and equipment that would've otherwise been deployed against the Red Army.
How likely was D-Day to fail? Enough that Eisenhower wrote a speech to shoulder 100% of the blame and resign his commission as Supreme Commander of the Allied Forces.
This is that speech;
Had the landings failed it would've arguably have been Germany's greatest victory in the war. Because the Soviets, the Germans and most of all the Western Allies themselves knew that they wouldn't be able to attempt another landing for
at least another year, maybe more.
What would that have meant in the long run? The danger to the Germans in their western border would've effectively evaporated. Men and material that had up until then been set there specifically to combat any attempted invasion could've been redirected. To the Eastern Front.
The Germans were hemorrhaging on the Ostfront, and the influx of men means they likely would've been able to stabilize it. The Soviet's
Operation Bagration still goes through, obviously, but the extra forces(including Luftwaffe) would've given the Germans a far better position, not to even mention the morale boost of having defeated the Allies on the shores of France. It would've also allowed the Germans to better reinforce the south of France and thus also probably fend off
Operation Dragoon too.
So what's the long-term ramifications of this? Well, a longer war means a longer Holocaust. It also means that at least one nuclear weapon is going to be deposited on German soil, exactly where I'm not sure. There are a number of equally likely possibilities regarding what the European front would look like in this world's August, 1945. The Germans could somehow manage to achieve a serious lucky streak and the Eastern Front be significantly further from Berlin, or they could've collapsed and the Red Army would be knocking on the Fuehrerbunker's front door.