The Collaborative International Dictionary of English v.0.48:

Fusillade \Fu"sil*lade"\, n. [F. fusillade, cf. It. fucilata.
   See Fusil a firelock.] (Mil.)
   A simultaneous discharge of firearms.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fusillade \Fu"sil*lade"\, v. t. [imp. & p. p. Fusillader; p.
   pr. & vb. n. Fusillading.]
   To shoot down of shoot at by a simultaneous discharge of
   firearms.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fusillade
    n 1: rapid simultaneous discharge of firearms; "our fusillade
         from the left flank caught them by surprise" [syn:
         fusillade, salvo, volley, burst]
    v 1: attack with fusillade