Let's find out...

12345678910111213
Across
  1. 3. The latter part of the day and early part of the night.
  2. 5. Preposition.
  3. 6. The capital of Germany
  4. 8. A cardinal number, ten plus four.
  5. 10. A conflict carried on by force of arms
  6. 11. A fortress that commands a city and is used in the control of the inhabitants and in defense during attack or siege.
  7. 13. Definite article
Down
  1. 1. The fourth day of the week, following Tuesday.
  2. 2. The condition that distinguishes organisms from inorganic objects and dead organisms.
  3. 4. Key word!
  4. 7. The sixth month of the year.
  5. 9. A slip, usually of paper or cardboard, serving as evidence that the holder has paid a fare or admission.
  6. 12. Chemical substances used in the treatment, cure, prevention, or diagnosis of disease