affaire d'honneur vs fighting

affaire d'honneur

noun

  • A duel. 

fighting

noun

  • A fight or battle; an occasion on which people fight 

  • The act or process of contending; violence or conflict. 

adj

  • Engaged in war or other conflict. 

  • Apt to provoke a fight. 

How often have the words affaire d'honneur and fighting occurred in a corpus of books? (source: Google Ngram Viewer )