Chemical warfare world war one

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Across
  1. 5. what was the most used gas in ww1
  2. 6. which battle was the first use of chemical weapons ww1
  3. 8. what was the first lethal poison gas used in world war 1
  4. 9. what protocol banned the use of chemical warfare in 1925
  5. 10. what color is mustard gas in world war one (color is on the rainbow)
Down
  1. 1. approximately how many thousand people died from chemical warfare in world war one
  2. 2. what gas mask protects you from mustard gas in world war 1 (full name and no spaces)
  3. 3. who is the father of chemical warfare (whole name not middle name and no spaces)
  4. 4. what country was the first to use poison gas in world war 1
  5. 7. what was the clear gas in ww1