On the night of January 11, 1945, fog, low clouds, and blizzards reduced visibility at times to literally zero along the Sandomierz bridgehead. So the German troops did not notice tanks, assault guns, and towed artillery pieces moving in position by the thousands along the east bank--the Russian side--of the Vistula River. Within seconds after the order to fire was given by the Soviet commander, General Konev, the air became incandescent with unnatural...