At this critical moment the Spaniards began to show signs of exhaustion through their tremendous exertions in two successive fights under a hot sun in the yielding sand-hills; and the prince, at the critical moment, throwing himself into the midst of his retreating troops, succeeded in rallying them.

At the same time he ordered some squadrons of cavalry which he had kept in reserve to charge on the flank of the advancing foe.

The effect was instantaneous.

The Spaniards were thrown into confusion, broke and fled.

The victory was complete.