WW1 Crossword puzzle

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Across
  1. 2. warfare in which opposing armed forces attack, counterattack, and defend from relatively permanent systems of trenches dug into the ground
  2. 5. he was 2nd among the us army air service during WW1
  3. 7. died after jumping off us army ship in Havana during WW1
  4. 11. the land-based element of a broad strategy to defeat the Ottoman Empire
  5. 12. Letter from German Ambassador to Mexico
  6. 14. Ferdinand-Archduke was shot and killed, starting the WW1
  7. 15. Verdun longest battle in WW1 and was fought on hills of north Verdun
Down
  1. 1. straight forward delivery and advice in situations
  2. 3. man who shot and killed the Archduke Franz Ferdinand, kick-starting WW1
  3. 4. nicknamed "black death" defended allied lines and saved fellow soldiers.
  4. 6. Versailles treaty which ended WW1, started Ww2
  5. 8. lieutenant in US Navy during WW1
  6. 9. helped capture over 100 Germans in ww1
  7. 10. huge virus which spread around this time and killed many people.
  8. 13. served in the American Expeditionary Forces in France