WW1 Crossword Puzzle

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Across
  1. 3. Armored vehicles used in war
  2. 6. When 2 or more countries team up
  3. 7. something you run through during war
  4. 9. fighting between 2 or more countries
Down
  1. 1. a paper that a leader signs to end a war
  2. 2. a commander in the army
  3. 4. when the military recruits civilians
  4. 5. something you breath in and slowly kills you
  5. 8. a person that joins the war