call to arms vs enlist

call to arms

noun
  • An appeal to fight or to engage in conflict. 

  • An appeal to undertake a particular course of action or to support a specific cause; a call to action. 

enlist

verb
  • To recruit the aid or membership of others. 

  • To enter on a list; to enroll; to register. 

  • To secure; to obtain. 

  • To voluntarily join a cause or organization, especially military service. 

noun
  • One who is enlisted, usually in a military service. 

How often have the words call to arms and enlist occurred in a corpus of books? (source: Google Ngram Viewer )