two-step vs war dance

two-step

noun
  • A piece of music for this dance 

  • A ballroom dance in duple time, having long, sliding steps 

adj
  • Used other than figuratively or idiomatically: see two, step. 

war dance

noun
  • A ceremonial dance performed before a major battle or after a victory, usually by a tribe. 

How often have the words two-step and war dance occurred in a corpus of books? (source: Google Ngram Viewer )