litigate vs skirmish

litigate

verb
  • To dispute; to fight over. 

  • To go to law; to carry on a lawsuit. 

  • To contest in law. 

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 litigate and skirmish occurred in a corpus of books? (source: Google Ngram Viewer )