hussar vs light cavalry

hussar

noun
  • A member of the light cavalry of any of several European armies. 

  • A member of the national cavalry of Hungary, Croatia and Poland. 

light cavalry

noun
  • A military unit consisting of lightly armed and lightly armored troops mounted on horses. 

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