WWI Technology

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Across
  1. 2. large guns that are used to shoot over a great distance
  2. 6. mans land land between the trenches of opposing armies
  3. 8. to stop supplies from entering a country
  4. 9. another person of country supporting each other
  5. 10. not taking sides in war
  6. 13. something that is used for fighting
Down
  1. 1. temporary peace
  2. 3. further action or progress in war is impossible
  3. 4. machines or pieces of equipment that is created by the use of science
  4. 5. secret information collected about an enemy
  5. 7. a ship that can operate underwater
  6. 11. deep, narrow holes in the ground used for protection
  7. 12. a tube-shaped bomb that is fired underwater