The top mistakes in The Heroes of Telemark http://www.moviemistakes.com/film1779 en Sat, 04 Oct 2008 05:55:10 +0000 12901 The daylight air-raid on the Norwegian Heavy Water plant in 1942 was done by Boeing B17G bombers, with the distinctive chin gun turrets. These planes did not come into service until 1944, when they were introduced to counter the head-on attacks by German fighters.