World war 1 Aviation and Aircraft

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Across
  1. 2. mounted machine guns
  2. 5. pilots fought enemy pilots in the air
  3. 6. the of the plane
  4. 7. These fights in the air were called
  5. 9. The first use of airplanes
  6. 10. tried throwing grenades at each other
  7. 13. An invention called an "interrupter" was invented by the
  8. 15. larger weight of bombs
  9. 16. all fighter planes used this invention
  10. 17. armies and drive them back
  11. 19. The airplanes would fly above the
  12. 20. for reconnaissance.
Down
  1. 1. soon found that the best way to shoot down an enemy plane
  2. 3. used as a significant part of the military
  3. 4. aircraft drops
  4. 8. Battle of the Marne
  5. 9. a mounted machine gun
  6. 11. used a number of different airplanes throughout the war
  7. 12. the war first began
  8. 13. to be synchronized with the propeller
  9. 14. The would fly above
  10. 18. The best of the pilots became famous and were nicknamed
  11. 19. the end of the war