duke it out vs skirmish

duke it out

verb
  • To argue heavily or at length. 

  • To fight, especially with the fists. 

skirmish

verb
  • To engage in a minor battle or dispute 

noun
  • A brief battle between small groups, usually part of a longer or larger battle or war. 

  • Any minor dispute. 

  • A type of outdoor military style game using paintball or similar weapons. 

How often have the words duke it out and skirmish occurred in a corpus of books? (source: Google Ngram Viewer )