It was done.

The whole splendid array of horsemen broke in rout; they went streaming back in disordered squadrons over the plain, each trooper striving to outride his fellow in the flight.

Pompeius had launched his most deadly bolt, and it had failed.
Now was Drusus's chance.

No further order had been given him; to pursue cavalry with infantry were folly; he needed no new commands.
The six cohorts followed his lead like machinery.

The crash of battle dimmed his voice; the sight of his example led the legionaries on.
They fell on the Pompeian archers and slingers and dispersed them like smoke.