WWI Technology

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Across
  1. 3. Powered aircraft with fixed wings and a weight greater than that of the air it displaces.
  2. 5. A type of airship used for spying during WWI.
  3. 6. Rapid-firing automatic firearm capable of sustained fire.
  4. 7. A fortified defensive position often dug into the ground.
  5. 9. Large-caliber guns used for long-range bombardment.
Down
  1. 1. Chemical weapon used during WWI, causing respiratory problems.
  2. 2. Watercraft capable of submerging and operating underwater.
  3. 4. The barren and dangerous area between opposing trenches.
  4. 8. Device that projects flamable liquid to cause ignition.
  5. 10. Armored military vehicle designed for front-line combat.