Tabarak and Jon

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Across
  1. 4. new fighting technique
  2. 6. Powerful new weapon in World War I.
  3. 9. Trenches were ____ after the rain
  4. 10. longest battle of war.
  5. 11. weapon that shoots fire
  6. 14. a ship under the water
Down
  1. 1. won world war I
  2. 2. fought in the sky
  3. 3. First war dog.
  4. 5. German army took over this country
  5. 7. Mans Land - space between the front lines with barbed wire
  6. 8. trenches were located here
  7. 12. made soldiers itchy
  8. 13. First introduced by the British.