fusillade

The simultaneous firing of a number of firearms.

A rapid burst.

But her husband was on his hands and knees groping wildly on the floor in search of the paw. If he could only find it before the thing outside got in. A perfect fusillade of knocks reverberated through the house, and he heard the scraping of a chair as his wife put it down in the passage against the door.

To fire, or attack with, a fusillade.