A rallying term used by proponents of a cause
(Noun)
Synonyms:
  1. battle cry
  2. call to battle
  3. bid to combat
  4. cry
  5. gauntlet
  6. glove
  7. motto
  8. invitation to combat
  9. rallying cry
  10. mobilize
  11. open hostilities
  12. war cry
  13. rally
  14. take up arms