WordWeb Online

1. A slogan used to rally support for a cause
   "a rallying cry to arms";
   - war cry, battle cry, cry, watchword
    
2. A yell intended to rally a group of soldiers in battle
   - war cry, war whoop, battle cry

Derived forms: rallying cries

Type of: call, catchword, cry, motto, outcry, shibboleth, shout, slogan, vociferation, yell