La Bataille du Rail (Battle of the Rails) is regarded by many cineastes as the one truly great French resistance film. Based on fact, the episodic plotline details the courageous efforts by French railray workers to sabotage Nazi reinforcement-troop trains. The film's thesis is that this underground activity was largely responsible for the allied victory on D-Day. Writer-director Rene Clement enhanced the reality of the story by filming on actual locations and using genuine railway employees and resistance fighters in the cast. Admittedly slow going at times, La Bataille du Rail is more successful as a morale-booster than as pure entertainment.