WW1 Crossword Puzzle

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Across
  1. 5. A device used in submarines to see above the water
  2. 8. The process of preparing troops and equipment for war
  3. 10. A German submarine used to attack enemy ships
  4. 12. A formal agreement between nations
  5. 14. A powerful type of battleship introduced in the early 1900s
  6. 16. The act of preventing goods or supplies from reaching a country
  7. 21. A long narrow ditch dug into the ground where soldiers lived and fought
  8. 22. Concealment used to hide soldiers or equipment
  9. 23. A psychological condition caused by the trauma of battle
  10. 24. A chemical weapon that caused severe burns and blindness
Down
  1. 1. A group of ships traveling together for protection
  2. 2. An underwater explosive weapon fired from submarines
  3. 3. A large German airship used for bombing raids
  4. 4. Information spread to influence public opinion
  5. 6. Large-caliber guns used in warfare
  6. 7. An armored vehicle introduced during World War I to cross trenches and break enemy lines
  7. 9. Soldiers who fight on foot
  8. 11. Continuous artillery fire over a wide area
  9. 13. The title of the German emperor
  10. 15. A short-barreled artillery gun used to fire shells at high angles
  11. 16. A blade attached to the end of a rifle for close combat
  12. 17. An agreement to stop fighting
  13. 18. The dangerous open space between opposing trenches
  14. 19. A nickname for an American soldier in World War I
  15. 20. The palace where the peace treaty ending the war was signed