While Sandoval remained at Naco, the chiefs of two neighbouring districts, named Quecuspan and Tanchinalchapa, complained to him of a party of Spaniards, at the distance of a days march from Naco, who robbed their people and made slaves of them.  Sandoval set out against these people immediately with a party of seventy men, and on coming to the place these Spaniards were exceedingly surprised at seeing us and took to their arms; but we soon seized their captain and several others, and made them all prisoners without any bloodshed.  Sandoval reprehended them severely for their misconduct, and ordered all the Indians whom they had made prisoners to be immediately released.  One Pedro de Garro was the commander of these men, among whom were several gentlemen, and in comparison of us dirty and worn down wretches, they were all mounted and attended like lords.  They were all marched to our head-quarters as prisoners; but in a day or two they became quite reconciled to their lot.  The occasion of their coming into the country was as follows:  Pedro Arias de Avila, the governor of Tierra Firma, had sent a captain named Francisco Hernandez to reduce the provinces of Nicaragua and New Leon, and to establish a colony in that place, which he accomplished.  After the atrocious murder of Balboa, who had married Donna Isabella the daughter of Aries, Moreno had been sent over by the court of royal audience, and persuaded Hernandez, who was now comfortably settled, to throw off his dependence upon Pedro Aries, and to establish a distinct government immediately under the royal authority.  Hernandez had done so, and had sent this party under de Garro on purpose to open a communication from Nicaragua with the north coast, by which to receive supplies from old Spain.  When all this was explained to Sandoval, he sent Captain Luis Marin to communicate the intelligence to Cortes, in expectation that he would support the views of Hernandez.  I was sent along with Marin on this occasion, our whole force consisting of ten men.  Our journey was exceedingly laborious, having to cross many rivers which were much swollen by the rains, and we had at times to make our way through hostile Indians armed with large heavy lances, by which two of our soldiers were wounded.  We had sometimes three difficult rivers to cross in one day; and one river, named Xagua, ten leagues from Triumpho de la Cruz, detained us for two days.  By the side of that river we found the skeletons of seven horses, which had belonged to the troops of de Oli, and had died from eating poisonous herbs.  Several of the rivers and inlets on our journey were much infested by alligators.