bring to heel vs pacify

bring to heel

verb
  • To cause to act in a disciplined manner. 

  • To compel someone to obey; to force someone into a submissive condition. 

pacify

verb
  • To appease (someone). 

  • To bring peace to (a place or situation), by ending war, fighting, violence, anger or agitation. 

How often have the words bring to heel and pacify occurred in a corpus of books? (source: Google Ngram Viewer )