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Across
  1. 2. 1917 upheaval
  2. 4. War end
  3. 6. D-Day landing
  4. 9. First circumnavigator
  5. 10. 1929 crash
  6. 11. Explorers
  7. 12. Second global war
  8. 14. Proclamation
  9. 16. 1840s starvation
  10. 18. 1770 clash
  11. 19. London blaze
  12. 20. French upheaval
Down
  1. 1. Trials
  2. 3. 1969 achievement
  3. 5. Peace accord
  4. 7. Ancient sports
  5. 8. New World discoverer
  6. 10. Naval fleet
  7. 13. Desert Storm
  8. 15. Moon mission
  9. 17. Landmark case