Ninjas!

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Across
  1. 2. give (someone or oneself) a different appearance in order to conceal one's identity
  2. 5. take aggressive action against (a place or enemy forces) with weapons or armed force
  3. 6. various sports or skills, mainly of Japanese origin, that originated as forms of self-defense or attack, such as judo, karate, and kendo
  4. 10. a person who is actively opposed or hostile to someone or something.
  5. 11. a weapon in the form of a star with projecting blades or points, used as a missile
Down
  1. 1. strike or propel forcibly with the foot
  2. 3. to be quick
  3. 4. a brave or experienced fighter
  4. 7. not making or accompanied by any sound
  5. 8. a person who has a comprehensive and authoritative knowledge of or skill in a particular area.
  6. 9. a person who is admired or idealized for courage, outstanding achievements, or noble qualities.