The imperial generals found the French so strongly intrenched that, notwithstanding the powerful motives which urged them on, they hesitated long before they ventured to attack them; but at last the necessities of the besieged and the murmurs of their own soldiers obliged them to put everything to hazard. Never did armies engage with greater ardor or with a higher opinion of the importance of the battle which they were going to fight; never were troops more strongly animated with emulation, national antipathy, mutual resentment, and all the passions which inspire obstinate bravery. On the one hand, a gallant young monarch, seconded by a generous nobility and followed by subjects to whose natural impetuosity indignation at the opposition which they had encountered added new force, contended for victory and honor. On the other side, troops more completely disciplined, and conducted by generals of greater abilities, fought from necessity, with courage heightened by despair. The imperialists, however, were unable to resist the first efforts of the French valor, and their firmest battalions began to give way. But the fortune of the day was quickly changed. The Swiss in the service of France, unmindful of the reputation of their country for fidelity and martial glory, abandoned their post in a cowardly manner. Leyva, with his garrison, sallied out and attacked the rear of the French, during the heat of the action, with such fury as threw it into confusion; and Pescara, falling on their cavalry with the imperial horse, among whom he had prudently intermingled a considerable number of Spanish foot armed with the heavy muskets then in use, broke this formidable body by an unusual method of attack, against which they were wholly unprovided. The rout became universal; and resistance ceased in almost every part but where the King was in person, who fought now, not for fame or victory, but for safety. Though wounded in several places, and thrown from his horse, which was killed under him, Francis defended himself on foot with a heroic courage.