If Germany Had Somehow 'Perfected' The Atom Bomb Before The U.S. Actually Did During WWII....

The Germans surrendered in 1945. So it would be a year and a half from late 1943.

Options...

a. In Spring, 1944, the Soviets utterly destroyed Army Group Center and poured through the gap. The bomb target would be the concentration of Soviet forces headed towards Warsaw. Or in 1945 the concentration of Soviets in Poland could be the target, but they would be closer to Germany. Killing 100k Russians wouldn't stop them, though.

b. Normandy - the Allies landed on a wide front, so one bomb wouldn't get them all. Destruction of the Mulberries could slow down the invasion and breakout. But an attack on the western Allies means the Soviets would be the ones who occupy Germany.

c. London - Hitler was initially hopeful the British would join him against the Soviet Union. Years later he seemed resentful that Britain would survive the war when Germany would not. Most of the casualties would be civilians, although it's possible the British high command could be affected. But this target would just be sour grapes. Then again, Hitler was willing to destroy Paris.

With only one bomb, any target would simply delay the inevitable and certainly infuriate the Allies. But I think a is the most likely option and the one which German generals would support.

Thanks. I don't understand what you mean when you say it pisses you off.

Assuming they have by 1943, which is completely unrealistic, their best chances would be to use it against the Russians and bluff the western allies with threats of additional atomic bombings against the West if they don't sign a peace treaty or an armistice. 

That being said; Berlin will probably be the target of Little Boy. 

London, most likely. It was the biggest allied city within easy range of German bombers and/or missiles.

If they could come up with a way to launch it at New York or Washington DC, they'd likely do that instead. There were German plans for trans-atlantic bombers and submarine-launched V2s, but they were pretty speculative.

Also worth noting, none of this would help Germany. Nuke London or New York, and it's really not going to stop the war effort.

It's an interesting question. London seems the most sensible target, but knowing Hitler he might have ordered to use it on Berlin, destroying the German capital entirely in an act of collective suicide, so it wouldn't fall into the hands of the allies. Although whether his orders would've been followed is an entirely different question of course.

London. New York or Washington would have been the ideal target, but the Luftwaffe had no way to deliver it. I suppose they could have accelerated the Amerikabomber program. My understanding was that Germany scrapped their plans for a trans-Atlantic bomber because they didn't have the A-Bomb.

I don't understand why the Luftwaffe never destroyed Moscow. It was bombed, but Moscow never suffered like London or Rotterdam. And they certainly were within range.