World war one

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Across
  1. 4. a place between trenches
  2. 6. something that flies
  3. 8. a metal mechanised machine
  4. 11. a wire with metal spikes on it
Down
  1. 1. a weapon that was automatic
  2. 2. a boat that was hit by a German torpedo
  3. 3. a weapon that dispenses fire
  4. 5. a rodent
  5. 7. is a hero that protected the soldiers from gas
  6. 9. a protected position
  7. 10. a chemical weapon