Sorry Woody, but I have to agree with Hagar on the German Atomic bomb business. I have read, and seen on many docos, that the German bomb program, in so far as it existed, was well behind the US program. I've constantly heard figures of at least 2 years off at wars end.
(All their 'heavy water' was destroyed in Norway, ala the Movie - I think that episode alone put the program back a couple of years. as the HW was essential to the research and production of the weapon)
But apart from that, the Yanks would certainly have still been bombing the 'living crap' out of cities such as Hamburg, Dresden etc.
I think it would have taken the Russians at least another 6 months to a year to get to Berlin. As it was, with D-day successful and the second front a reality, they took almost another year. By that time of course, Berlin would have been a smouldering ruin. As would virtually every other city in Germany. Not to mention the Industrial infrastructure, which was well below the required capacity to supply even the Eastern Front alone, with the required equipment and supplies.
Imagine the additional destruction that would have been unleashed on Germany if the US and Brits had not had the French front to worry about. Remember also, that Ike had given Bomber command over to the Normandy Invasion and subsequent campaign months prior to D-Day (to the chagrin of Lee Mallory).
So all this, I think would have culminated in a very, very wrecked Germany. Not to mention her Armies, due to the lack of supplies and equipment (which was already stetched very thinly) due to a more concentrated bombing campaign than the one we now know.
Consider the result of 500 or so B29's in Europe. they could have been bombing (20,000lbs each) the Eastern Front!! US industry would have had no problem with turning out the extra planes etc for an extended European War.
D-Day's failure would certainly have been a dreadful drawback, but I think, through Italy and the continued bombing, Germany would not have been in any position to mount any invasions (if indeed the original invasion of Britain was really intended, which I think not - she never had the landing craft! - let alone the completye lack of any Western Airforce to speak of at that stage).
Also, with the troops and equipment that the Yanks had in Britain, Germany would have been very hard pressed to have made any kind of headway had an invasion resulted anyway.
Further, I just thought, had D-day failed, I think that the US and Brits sending troops via the Baltic and/or Dardenelles to the Eastern front would have been a consideration, at least in as much as it would have given the US more control over what actually happened from that side.
puff....puff.....puff (all out of steam.............

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As Goering put it later: "When I saw Mustangs over Berlin (early '44), I knew the jig was up"...........
