Six long years later and in a very different world from what they had so confidently predicted they'd be in, back in 1939, the Allied world celebrated that they had won.
(Those of the world - the majority - who had remained neutral during some or all of the moral battle against Hitler's evil chimed in that they had helped, too, by killing this latter day Kaiser with their mouths.)
More accurately, the Allies had survived : calling it 'winning' was going more than a bit too far.