Corrected entry: In real life Vassili Zaitsev killed Major Konig by having someone hold a helmet over his head in an open window and Major Konig shot the helmet and the person holding the helmet screamed as if he was hit. Vassili saw the muzzle flash of Konig's rifle and shot him where he was hiding under a piece of sheet metal. (I guess one of the oldest tricks in the book still works)
jaws65
30th Jul 2003
Correction: In real life, it's highly unlikely this duel ever happened, suggest you read Stalingrad by Anthony Beevor or check this link http://www.russian-mosin-nagant.com/Zaitsev_story.htm.