What world war II movie is this?

I'm looking for a movie for my great grandfather, the movie is based during World War II on supposedly a true story, This German General goes to this town where he hears there is a gold mine to seek the fortune, knowing this the townspeople melt all the gold into runners for sleds, the kids ride the sleds down hills to the townspeople where they sneak it out, because the general would never suspect a sled had gold in it, please help me, he wants it for his birthday and he can;t remember the name.