Words with silent letters

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Across
  1. 5. A snack formed of various ingredients between two slices of bread
  2. 6. Something that has the potential to explode
  3. 7. A response to a question
  4. 9. A large fortified building
  5. 12. A warrior, especially of the Middle Ages
  6. 15. A body of land surrounded by water
Down
  1. 1. A hand weapon with a sharp point
  2. 2. From a different country
  3. 3. A worker who installs and repairs water pipes
  4. 4. One of two equal parts
  5. 8. To travel on foot
  6. 10. The season that comes between summer and winter
  7. 11. To put into spoken words
  8. 13. The opposite of innocent
  9. 14. A small cake