billeting vs occupation

billeting

noun
  • The lodging of soldiers. 

occupation

noun
  • The act, process or state of possessing a place. 

  • The control of a country or region by a hostile military and/or paramilitary force. 

  • An activity or task with which one occupies oneself; usually specifically the productive activity, service, trade, or craft for which one is regularly paid; a job. 

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