Across
- 3. Built the Royal Roads and established satraps
- 5. Linked Rome to Brisindi
- 8. Manx and Breton, e.g.
- 10. Country of Elphinstone's retreat
- 11. 12th Battle of the Isonzo
- 12. Battle that let DC be sacked
- 16. 1812 invasion locale
- 17. Plant parts, or one of the themes of this crossword
- 19. Tubman railroad
- 23. 1914 Russian defeat against General Hindenburg
- 27. 66, e.g., or one of the themes of this crossword
- 28. Crushing defeats, or one of the themes of this crossword
- 29. Pioneers followed it to its state
- 30. Canadian passage
Down
- 1. Hannibal's double envelopment
- 2. Fertile ___________
- 4. Last battle of the Texan Revolution
- 6. Made Cape Horn obsolete
- 7. Linguistic group that migrated from the Congo
- 9. Movement to establish a Jewish homeland
- 13. Lucy's home, the Great ________ Valley
- 14. Crassus' fatal foes
- 15. Travel around the globe
- 18. Central Asian road
- 20. Eisenhower highways
- 21. 7th Cavalry colonel
- 22. Charge of the Light Brigade author
- 24. _______-Indo-European
- 25. Critical southern Chinese supply road
- 26. Central Asians turned Hungarians