War and weapons

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Across
  1. 3. used during world war
  2. 4. started by hitler
  3. 6. war against slavery
  4. 7. made by Oppenheimer
  5. 8. Tank in World War 2
  6. 9. strongest helicopter
Down
  1. 1. made famous by Russians
  2. 2. caused attack of the dead men
  3. 5. Vietnamese war
  4. 10. German pistol not the Mauser