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Across
  1. 1. 1969 festival
  2. 4. 1956 conflict
  3. 6. Civil War battle
  4. 10. First airplane
  5. 11. Ancient battle
  6. 13. Project creation
  7. 15. Fall of
  8. 19. Genocide tragedy
  9. 21. Waterloo defeat
  10. 23. Bombed city
  11. 24. Spain-Portugal pact "Treaty of ..."
  12. 25. End of slavery
Down
  1. 2. Nuclear disaster
  2. 3. Reformation
  3. 5. Women's vote
  4. 7. First satellite
  5. 8. Armstrong's step
  6. 9. Cold War divide
  7. 12. Cultural revival
  8. 14. Beach landing
  9. 16. Japanese attack
  10. 17. Medieval plague
  11. 18. Artistic boom
  12. 20. WWI ceasefire
  13. 22. Modern revival