This reminds me of the Soviet blockade of West Berlin. Virtually overnight two sides that had been trying to kill each other were working hand in hand to save the Germans living in Berlin.
-Considering the scale of the hostilities, I don't think it is much hyperbole to suggest the turn in attitude happened virtually overnight.
I do seem to recall that the Berlin airlift more than any other event was what turned the inhabitants of the western zones around from seeing the Allies as occupants to, well, allies.
Except that the blockade began 3 years after hostilities between the US and Germany ended.