About this time, it was determined to dispatch the licentiate Carvajal with three hundred mounted musqueteers, together with the detachment under Juan d'Acosta, to scour the coast to the northwards, and to attack Diego de Mora who had withdrawn into the province of Caxamarca. When every thing was in readiness for this expedition, the lieutenant-general Carvajal went one morning early to Gonzalo, and represented to him, that it was by no means safe to entrust so important a command to the licentiate, as a person in whom they could not repose implicit confidence. That although he had hitherto attached himself to their party, it was obviously for the sole purpose of being revenged of the late viceroy; and, as that purpose was now accomplished, it did not appear that his fidelity could be depended upon. It was proper to recollect, he added, that all the brothers of the licentiate were greatly attached to his majesty, particularly the bishop of Lugo who enjoyed several high employments; so that it was not to be imagined the licentiate would act cordially in the interest of a party which was diametrically opposed to that in which all his nearest relations were engaged. Besides all which, this person had formerly been made a prisoner by themselves, without any just foundation, and had even been so nearly punished capitally, that he had been ordered to make his testament and to confess himself in preparation for death, which injurious treatment he could not be supposed to have forgotten. Gonzalo was so much convinced by these arguments, that he countermanded the order given to the licentiate Carvajal, and sent off Juan d'Acosta on the expedition to Caxamarca, with a force of two hundred and eighty men. D'Acosta accordingly set out on this intended service, taking the road for Truxillo; but on arriving at Baranza, about twenty four leagues from Lima, he halted at that place for reasons which will appear in the sequel.
At this period, the Captain Saavedra, who was lieutenant-governor of Guanuco for Gonzalo, received letters from Aldana urging him to quit the insurgent party and to declare for his majesty. He accordingly determined to do so; and under pretence of obeying the orders he had received from Gonzalo of joining his army at Lima, along with Hernando Alonzo, he assembled all the soldiers he could procure in that province, with whose assistance he fortified the city of Guanuco, and informed them of his resolution to exert his best endeavours in the service of the king. All his soldiers agreed to follow his example, except three or four who fled and informed Gonzalo of the defection of their governor. Saavedra retired immediately to Caxamarca, with forty horsemen, where he joined Diego de Mora and those who had withdrawn along with him from Truxillo, where both declared themselves for the royalist party. On learning the defection of Saavedra and the principal inhabitants of Guanuco, Gonzalo sent an officer to that place at the head of thirty soldiers; with orders to pillage and destroy the city: But the Indians of the neighbourhood, having armed themselves and taken possession of the place by the orders of their masters, made so resolute a defence that the insurgent detachment was beaten off, and constrained to return to Lima, being unable to procure any other plunder except some mares cattle and other animals belonging to the settlers.