Major vs commander in chief

Major

noun
  • Title for an army officer with the rank of major. 

name
  • A village in Saskatchewan, Canada. 

  • A surname. 

  • An unincorporated community in Kentucky. 

commander in chief

noun
  • Supreme commander of the armed forces of an entire country. 

How often have the words Major and commander in chief occurred in a corpus of books? (source: Google Ngram Viewer )