[Sixpack]

I would say all in all 1944 was the first good opportunity for a number of reasons.

Logistically, the balance in the BotA, the bombing campains to destroy/damage German industries, certain German battle fatigue and decreasing German public moral, in a small way also the occ. territories' underground movements, and some more factors.

The allied would have taken much harder knocks in 43 and a succesful outcome of the operation would have been highly doubtful.

Btw, hasnt there been a historically pretty obscure smaller scale invasion attempt in 43 on the N-France coast (by Canadians I think it was ?) which resulted in utter catastrophe ? I cant recall from memory when this took place.