New technology used (weapons, etc.)

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Across
  1. 4. sanitary
  2. 6. Flamethrowers
  3. 8. Mortars
  4. 9. chemical
  5. 10. x ray
  6. 12. Hydrophones
  7. 13. Depth charges
Down
  1. 1. Air-traffic
  2. 2. Tracer-bullets
  3. 3. Grenades
  4. 5. Artillery
  5. 7. gas
  6. 8. machine
  7. 11. Artillery