guidon vs standard-bearer

guidon

noun
  • A soldier assigned to carry such a banner. 

  • A small pennant or banner carried by infantry soldiers to direct troop movement. 

standard-bearer

noun
  • A person who carries a flag or banner (a standard). 

  • A person who visibly leads. 

How often have the words guidon and standard-bearer occurred in a corpus of books? (source: Google Ngram Viewer )