guerrilla warfare vs trooper

guerrilla warfare

noun
  • Combat using groups of irregular, light, mobile troops within areas occupied by an enemy force, usually through hit-and-run tactics. 

trooper

noun
  • A troopship. 

  • One who endures adversity or hardship with an attitude of stoicism and persistence. 

  • A cavalry horse; a charger. 

  • A mounted policeman. 

  • A soldier. 

  • A soldier of private rank in cavalry or armour. 

verb
  • To work steadily at an unpleasant job without complaint. 

  • To work as a trooper. 

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