WW1 Technology

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Across
  1. 4. Long ditch dug in the ground
  2. 6. Military observation of a region to locate an enemy or their strategic features
  3. 7. Used by both sides to clear trenches
  4. 9. Created chemical burns on contact, blisters oozing yellow fluid, blindness
  5. 10. Helped break the stalemate of trench warfare
Down
  1. 1. Difficult to detect
  2. 2. Aerial battles
  3. 3. 1st widespread use of rapid fire, spewed 400-500 rounds/minutes
  4. 5. Lungs filled with fluid
  5. 8. Area between 2 opposing trenches