carronade vs field gun

carronade

noun
  • A very short carriage gun used to fire a heavy shot for a limited range. 

  • An exchange of artillery fire; a cannonade; a fusillade. 

field gun

noun
  • An artillery piece, originally a smaller gun that could accompany a field army on the march and when in combat could be moved about the battlefield in response to changing circumstances. 

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