What if- A nuclear thought

[mapuc]

Last night I saw World War two-in colours, last episode.

In this episode that was about the war in the pacific and the use of nuclear weapon against Japan-A thought came up-What if we had devoloped the nuclear weapon before World war 2

1. Would the war have started?
2 If yes, when in the war, would the weapon have been used ?
3 if yes on both point, wich side would use it first ?

I didn't came longer that to number one. Would Germany have attacked Poland if they new that England had nuclear weapon? Or would the relay on the air defence if such an attack would occur?

Markus