agon vs pitched battle

agon

noun
  • An intellectual conflict or apparent competition of ideas. 

  • A contest in ancient Greece, as in athletics or music, in which prizes were awarded. 

  • A two-player board game played on a hexagonally-tiled board, popular in Victorian times. 

  • A struggle or contest; conflict; especially between the protagonist and antagonist in a literary work. 

pitched battle

noun
  • An intense, rancorous argument or confrontation. 

  • A battle which opposing forces anticipate and commit to fighting; a sustained, intense and confrontational fight. 

How often have the words agon and pitched battle occurred in a corpus of books? (source: Google Ngram Viewer )