Thus at the end of half an hour's fighting Tilly had disposed of the Saxons, and Gustavus had driven Pappenheim's horse from the field.
Three of the Scottish regiments were sent from the centre to strengthen Horn on the left flank, which was now exposed by the flight of the Saxons.

Scarcely had the Scottish musketeers taken their position when Furstenberg's horse returned triumphant from their pursuit of the Saxons, and at once fell upon Horn's pikemen.

These, however, stood as firmly as their comrades in the centre had done; and the Scottish musketeers, six deep, the three front ranks kneeling, the three in rear standing, poured such heavy volleys into the horsemen that these fell back in disorder; the more confused perhaps, since volley firing was at that time peculiar to the Swedish army, and the crashes of musketry were new to the Imperialists.
As the cavalry fell back in disorder, Gustavus led his horse, who had just returned from the pursuit of Pappenheim, against them.

The shock was irresistible, and Furstenberg's horse were driven headlong from the field.

But the Imperialist infantry, led by Tilly himself, were now close at hand, and the roar of musketry along the whole line was tremendous, while the artillery on both sides played unceasingly.
Just as the battle was at the hottest the Swedish reserve came up to the assistance of the first line, and Sir John Hepburn led the Green Brigade through the intervals of the Swedish regiments into action.