[jyl]

I think the same for Battle of Midway and other great WW2 battles. With the weight of industrial might and population on their side, I think the Allies' victory did not depend on any one battle.

Operation Barbarossa (German invasion of Russia) was not a single battle, it was a huge strategic decision. So it may not count, depending on how broad the question is.

Unless, that is, you posit that an extra year would have allowed Germany to develop the A-bomb. I don't know how close they got.

Even then, suppose Hitler had built two A-bombs and nuked London and Moscow in 1946. The US had two bombs in 1945 and could have had several by 1946. We had no V2 but our bombers were hitting Berlin regularly. What would we have done? Would the fundamental course of history have changed?