Was the policy of appeasement justified?

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Across
  1. 2. Britain and France declared war on 3 September
  2. 4. Stalin sought time to prepare for war
  3. 8. Cooperation that would later collapse
  4. 9. Negotiations with Hitler no longer possible
  5. 10. Promise to defend Poland from aggression
  6. 12. Pact made war in Europe almost certain
  7. 13. Promise not to attack each other
  8. 15. Pact fundamentally changed European politics
  9. 16. USSR occupied eastern Poland
  10. 18. Germany attacked on 1 September 1939
  11. 19. Plan to divide Poland between the two powers
  12. 21. Hitler insisted the city be returned to Germany
Down
  1. 1. Britain and France realised Hitler could not be trusted
  2. 3. Pact shaped early WWII borders
  3. 5. Tensions rising over German demands
  4. 6. Believed Britain and France were unreliable
  5. 7. Germany avoided a two‑front war
  6. 11. Unexpected alliance between rivals
  7. 14. Agreement between Germany and the USSR
  8. 17. Hitler free to invade Poland without fear of Soviet attack
  9. 20. Territory Hitler wanted to reclaim