Rafale

[…] a salvo is […] a succession of shots […] with the same elevation... a single shot for each piece. By a rafale is meant all the shots of a battery fired with the same elevation, without any determined order, at the rate of more than one shot per gun. According to circumstances, three different kinds of fire are employed ... first, progressive fire; second, fire with a single elevation; third, fire by salvos or by rafales...

And then, above the hum of the roadside, rose the voice of the great guns. The shells were bursting four or five miles away, and the guns must have been as many more distant. But in that upland pocket of plain in the frosty night they sounded most intimately near. They kept up their solemn litany, with a minute's interval between each - no rafale which rumbles like a drum, but the steady persistence of artillery exactly ranged on a target.

Then, as if a spring had been loosed, the world suddenly leaped to a hideous life. With a growl the guns opened round all the horizon. They were especially fierce to the south, where a rafale beat as I had never heard it before. The one glance I cast behind me showed the gap in the hills choked with fumes and dust.