(armed) struggle vs combat

(armed) struggle

combat

verb
  • To fight; to struggle against. 

  • To fight (with); to struggle for victory (against). 

noun
  • A battle, a fight (often one in which weapons are used). 

  • a struggle for victory 

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