Source : Webster's Revised Unabridged Dictionary (1913)

Musketry \Mus"ket*ry\, n. [F. mousqueterie; cf. It.
   moschetteria.]
   1. Muskets, collectively.

   2. The fire of muskets. --Motley.

Source : WordNet®

musketry
     n 1: musketeers and their muskets collectively
     2: the technique of using small arms (especially in battle)