opposite side vs stranger

opposite side

noun
  • A side, party (e.g. a team or armed force) seen as adversary, enemy etc. opposite one (or more) other(s), as in a battle or team sports competition. 

stranger

noun
  • One not privy or party to an act, contract, or title; a mere intruder or intermeddler; one who interferes without right. 

  • One who has not been seen for a long time. 

  • A person whom one does not know; a person who is neither a friend nor an acquaintance. 

  • A newcomer. 

  • An outsider or foreigner. 

  • One not admitted to communion or fellowship. 

How often have the words opposite side and stranger occurred in a corpus of books? (source: Google Ngram Viewer )