battalion vs corps

battalion

noun
  • an army unit having two or more companies, etc. and a headquarters; forming part of a brigade. 

  • Any large body of troops. 

  • A great number of things. 

  • An army unit having two or more companies, etc. and a headquarters. Traditionally forming part of a regiment. 

verb
  • To form into battalions. 

corps

noun
  • A battlefield formation composed of two or more divisions. 

  • An organized group of people united by a common purpose. 

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