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Watch Sworn to Secrecy: Secrets of War Season 9 Episode 5 Online

  • 6/10
  • COUNTRIES: United States of America,South Korea,United Kingdom,France,Germany,Russia,Vietnam
  • Subtitles: English

As the armies of World War One struggled under an onslaught of terrifying weapons, the German government broke the stalemate and issued in a new era of warfare by turning to covert operations.