It was not until about the year 1542, that we perceive in the viceroyal history, any attempts upon the part of the Indians to make formidable assaults against the Spaniards, whose oppressive and grinding system of _repartimientos_ was undoubtedly beginning to be felt. At this period the Indians of Jalisco rose in arms, and symptoms of discontent were observed to prevail, also, among the Tarascos and Tlascalans, who even manifested an intention of uniting with the rebellious natives of the north. Mendoza was not an idle spectator of these movements, but resolved to go forth, in person, at the head of his troops to put down the insurgents. Accordingly he called on the Tlascalans, Cholulans, Huexotzinques, Tezcocans, and other bands or tribes for support, and permitted the caciques to use horses and the same arms that were borne by the Spaniards. This concession seems to have greatly pleased the natives of the country, though it was unsatisfactory to some of their foreign masters. In the meanwhile, the coasts of America on the west, and the shores of California especially, were examined by the Portuguese Juan Rodriguez Cabrillo, as far north as near the 41st° of latitude; whilst another expedition was despatched to the Spice islands, under the charge of Ruy Lopez de Villalobos. The viceroy was moreover busy with the preparation of his army designed to march upon Jalisco, and, on the 8th of October, 1542, departed from Mexico with a force of fifty thousand Indians, three hundred cavalry, and one hundred and fifty Spanish infantry. Passing through Michoacan, where he was detained for some time, he, at length, reached the scene of the insurrection in Jalisco; but before he attacked the rebels he proclaimed through the ecclesiastics who accompanied him, his earnest wish to accommodate difficulties, and, even, to pardon, graciously, all who would lay down their arms and return to their allegiance. He ordered that no prisoners should be made except of such as were needed to transport the baggage and equipments of his troops; and, in every possible way, he manifested a humane desire to soften the asperities and disasters of the unequal warfare. But the rebellious Indians were unwilling to listen to terms:--"We are lords of all these lands," said they, heroically, in reply, "and we wish to die in their defence!" Various actions ensued between the Spaniards, their allies, and the insurgents, until at length, Mendoza obtained such decided advantages over his opponents that they gave up the contest, threw down their arms, and enabled the viceroy to return to his capital with the assurance that the revolted territory was entirely and permanently pacified. His conduct to the Indians after his successes was characterized by all the suavity of a noble soul. He took no revenge for this assault upon the Spanish authority, and seems, to have continually endeavored to win the natives to their allegiance by kindness rather than compulsion.