7a

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Across
  1. 2. Operation Market Garden
  2. 3. Octavian defeats assassins
  3. 7. WWI mass tank battle
  4. 12. Seljuk Turks defeat Byzantines
  5. 13. Early major Civil War battle
  6. 15. Hannibal defeated by Rome
  7. 16. Russians defeated in WWI
  8. 18. Mexican battle holiday
  9. 19. Ended Jacobite uprising
  10. 20. Poison gas first used
Down
  1. 1. Triggered US into WWII
  2. 4. Major Pacific theater battle
  3. 5. Three major battles in India
  4. 6. American invasion of Mexico
  5. 8. Octavian vs. Antony and Cleopatra
  6. 9. Ancient legendary siege
  7. 10. Stopped Ottoman expansion
  8. 11. Civil War battle 1863
  9. 14. Hannibal's tactical masterpiece
  10. 17. English longbows triumph