Source : Webster's Revised Unabridged Dictionary (1913)

Cannoneer \Can`non*eer"\, Cannonier \Can`non*ier"\, n. [F.
   canonnier.]
   A man who manages, or fires, cannon.

Source : WordNet®

cannoneer
     n : a serviceman in the artillery [syn: {artilleryman}, {gunner},
          {machine gunner}]