legionary vs soldier of fortune

legionary

noun
  • A person who is neither a citizen nor colonial/imperial subject of the state whose military they join. 

  • A soldier belonging to a legion; a professional soldier of the ancient Roman army. 

  • A member of a legion, such as the American Legion, or of any organization containing the term legion in its title (e.g. the French Foreign Legion). 

adj
  • Relating to, or consisting of, a legion or legions. 

  • Containing a great number. 

soldier of fortune

noun
  • A non-commissioned soldier willing to serve any state or person who will hire him. 

  • A person willing to work for or ally himself with any person or institution who will take him on. 

How often have the words legionary and soldier of fortune occurred in a corpus of books? (source: Google Ngram Viewer )