A Game of Two Halves

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Across
  1. 2. Nickname for a football
  2. 5. Take a player to the ground
  3. 7. Part of the uniform
  4. 9. Number of teams in the NFL
  5. 10. A team from the Empire state
  6. 12. Keeps the body safe
  7. 13. Oops
  8. 14. Football official
  9. 15. 1,2,3,4
Down
  1. 1. Results in a turnover
  2. 3. Tackle the quarterback
  3. 4. Score in end zone
  4. 6. Protection for the head
  5. 8. Team gathering
  6. 11. Championship game