feud vs skirmish

feud

verb
  • To carry on a feud. 

noun
  • A state of long-standing mutual hostility. 

  • An estate granted to a vassal by a feudal lord in exchange for service. 

  • A staged rivalry between wrestlers. 

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