Words Backed by Nuclear Weapons

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Across
  1. 1. Insane topics in technology (6)
  2. 4. Xerxes, Commander of Millions, tops soldiers from the future (4)
  3. 6. Wild trap captures whale at last: a wonder for desert people (5)
  4. 7. Microsoft steps back after the French woman starts to insist, “Free monument!” (8)
  5. 10. More units for crazy orca rider (“Ow!”) (7, 4)
  6. 12. Leading horseman dismounted backwards after a time (6)
  7. 13. Awkward "I do": ripe Emperor upset about bride (7)
  8. 14. Sour livers? Get a mint (6)
  9. 16. Returning Roman takes rest at first; follows odd Mr. Doe, a fast treader? (6, 5)
  10. 17. Awkward ensign interrupts systems engineer--”You need this for the ship” (2, 6)
  11. 18. Nation was bright; torn apart by pointless footwear (8)
  12. 20. Eddy escaped carrying two or three gold (4)
Down
  1. 2. Country returns material cut away from tree--start of a natural disaster (6)
  2. 3. Popular pantheon terribly reeked of trolls (6, 8)
  3. 5. Reportedly destroy, defeat, send back a French ranged unit (3,2,2)
  4. 6. Mr. Ed López brings back an amazing improvement (6)
  5. 8. One thousand dollars and hydrogen first for nuclear warlord (6)
  6. 9. Wonder rifle has very loud impact starting out (6)
  7. 11. Feline of a woman suffers, loses head and tail for Empress (9)
  8. 15. Rarely lit flying cannon (9)
  9. 19. Alloy is appropriate, I hear (5)