Both armies being drawn up in good order, the insurgents advanced, to the sound of trumpets and other musical instruments, till within six hundred paces of the enemy, when Carvajal ordered them to halt. The royalists continued to advance till within a hundred paces less, and then halted likewise. At this time, forty musqueteers were detached from the army of Gonzalo, with orders to begin the engagement; and two other parties of musqueteers, of forty men each, were posted on the wings, Pizarro taking his station between his cavalry and infantry. Thirty musqueteers were likewise advanced from the army of Centeno, to skirmish with those of the insurgents. As Carvajal observed that the royalists waited the attack in good order, he ordered his troops to advance a few steps very slowly, in hopes of inducing the enemy to make some movement or evolution which might occasion confusion in their ranks. This had the desired, effect, as the royalists, believing that their enemies, though interior in number, wished to have the honour of making the attack, they began immediately to advance, and the insurgents by order of Carvajal stood firm to receive them. When tolerably near, Carvajal gave orders for a small number of his troops to fire their musquets, on which the royalists made a general discharge, and marched forwards at a quick step with levelled pikes, during which the royalist musqueteers made a second discharge without occasioning any loss to the enemy, as they were still three hundred paces distant. Carvajal made his men reserve their fire till the enemy was within about an hundred paces; when, with a few pieces of artillery, and the whole of his musqueteers, he threw in so destructive a volley that above an hundred and fifty of the royalists were slain, among whom were two of their captains. By this terrible slaughter, the whole infantry of the royalist army was thrown into disorder, entirely defeated, and took to flight, in spite of every effort of Captain Retimoso to rally them, who lay wounded in the field. Notwithstanding the defeat of the infantry, the royalist cavalry made a brave charge against the insurgents, of whom they killed and wounded a considerable number. On this occasion Gonzalo had his horse killed and was thrown to the ground, yet escaped unhurt. Pedro de Rios and Pedro de Ulloa, captains of cavalry belonging to Centeno, wheeled with their squadrons round the wing of the insurgent infantry, intending to charge their flank; but were opposed by the detachments of musqueteers which were posted on the wings, on which occasion De Rios and several others were slain. Being thus repulsed, and seeing their own infantry entirely defeated, the cavalry took likewise to flight and dispersed, every one endeavouring to save himself as he best could.