It depicts the efforts by railway workers in the French Resistance to sabotage German military transport trains during the Second World War, particularly during the Invasion of Normandy by Allies.

[2] While critics have often historically treated it as similar to Italian neorealism, it is closer to the traditional documentaries on which the director had worked.

In 1949 the film was distributed in America by Arthur Mayer and Joseph Burstyn.

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